PURCHASING SCOPE GUIDE How to Compare Mass Finishing Quotations for CNC Metal Parts Compare trial evidence, equipment scope, separation, drying and acceptance conditions before choosing a mass finishing quotation for industrial CNC parts. Quick answer: Two quotations with similar machine capacities may describe very different production systems. For CNC metal parts, compare the part specification and acceptance conditions first, then check exactly which equipment, consumables, handling steps and services are included. A quoted processing cycle is not necessarily the time needed to load, finish, separate, rinse, dry and inspect a batch. Use a shared comparison sheet and ask suppliers to label confirmed information, assumptions and items that still require a trial. Do not treat a low equipment price as evidence of a low cost per accepted part. Illustration note: The accompanying image is an AI-generated conceptual illustration for process discussion; it is not a real factory, customer case or measured result. Start with one common part brief Send each supplier the same drawing revision, material, incoming condition, protected features, target finish and expected production volume. Explain whether the examples represent the full production range or only one part variant. Keep photographs and acceptance reference samples traceable to that brief. Differences between incoming parts can make two trial reports difficult to compare, even when the suppliers use similar equipment. Use the sample trial record for the technical observations. The quotation comparison is a separate purchasing document: it records what is included, who is responsible and what remains unconfirmed. It should not replace a drawing or an inspection plan. Compare the scope, not just the machine label Question Evidence to request Open issue to record What part and finish was the proposal based on? Drawing revision, representative samples and agreed inspection criteria Untested variants or undefined acceptance limits What equipment is included? Itemized machine and accessory schedule Optional equipment excluded from the total How do parts leave the finishing stage? Separation, rinsing, drying and handling description Manual steps, handling marks or retained media needing investigation What consumables are included initially? Media and compound identification, initial supply and replenishment basis Future consumption not yet measured What does the time estimate include? Defined start/end points, batch quantity and observed trial conditions Loading, drying or inspection excluded from the estimate What must the buyer provide? Site utility and installation requirements for the quoted configuration Electrical, water, drainage, extraction or floor-space details not yet reviewed What completes acceptance? Agreed evidence, inspection method, responsibilities and unresolved exceptions A result demonstrated only on one sample or one trial Ask where the quoted process starts and ends A finishing step can be acceptable while the overall handling route remains incomplete. Ask whether the proposal ends with wet parts, separated parts or parts ready for the buyer's inspection. Identify the equipment and operator actions between those points. Separation guidance can help define the questions, but the supplier must confirm the method for the actual geometry. For wet processing, request a description of how process water and residues will be handled. This is a scope question, not a promise that any particular treatment method will meet the buyer's site requirements. Have the responsible site personnel review the proposed arrangement before the purchasing specification is finalized. Similarly, do not assume that one drying approach suits every part shape or surface requirement. Separate observations from estimates Label each comparison field as measured in a trial, specified by the supplier, estimated, or not yet confirmed. A measurement should identify the sample and conditions to which it applies. An estimate should identify its assumptions. This prevents an attractive number from being copied into a purchase order without knowing its basis. Avoid calculating cost per part from bowl capacity alone. If suppliers provide cost estimates, ask what accepted batch output, operator time, consumable consumption, utilities and additional handling they include. Record excluded items rather than inserting an assumed universal value. This guide provides no standard cycle, consumption rate or payback period. Resolve exceptions before choosing a supplier Create an exceptions list beside the comparison. It may include a protected thread that has not been checked, a second alloy not represented in the trial, or a downstream cleaning requirement still under review. Assign an owner and the evidence needed to close each point. A conditional trial result should remain conditional until the agreed questions are answered. For equipment selection context, review vibratory finishing machines. Select the process around the part and acceptance requirement, not around an advertised capacity or a general claim that one technology is always faster. FAQ Can two machines with the same capacity be compared directly? Capacity is only one field. Confirm the workpiece load, process route, separation, accessories and acceptance conditions before comparing the quotations. Should every supplier run an identical recipe? Not necessarily. Different proposed processes can be evaluated against the same agreed part requirements. Record what each supplier tested and avoid treating different trial conditions as directly equivalent. What should I send with an enquiry? Send the material, drawing revision or dimensions, incoming defect, protected features, target finish, expected volume and inspection criteria. Include only drawings and photographs cleared for supplier review. Contact SurfacePolish to discuss the scope of a part review; sample acceptance, charges and timing require project-specific confirmation. Technical context For general process-development context, see the Rösler Customer Experience Center. For drying-system distinctions, see Walther Trowal's mass-finishing dryer overview. For process-water considerations, see Walther Trowal's process-water case study. These sources provide industry context only and do not represent SurfacePolish test results or guarantees.

Mass Finishing Aluminum Parts: Deburr, Smooth and Brighten Without Smearing Aluminum surface finishing • Media, compound and cycle selection • From CNC parts to cosmetic components Aluminum is one of the most rewarding — and least forgiving — metals to mass finish. It deburrs fast, smooths beautifully, and polishes to an attractive satin-bright look. But it also smears under aggressive media, stains if slurry dries on it, and loses crisp edges faster than steel. The difference between a show-quality aluminum part and a scrapped one is almost always media choice and process discipline. Four rules that keep aluminum parts bright and dimensionally accurate The core problem. Aluminum is soft and gummy. Aggressive cutting media don’t slice it cleanly — they push and smear it, clogging media faces and leaving grey, burnished-looking streaks. Everything in this guide follows from avoiding that smear. 1. Know Your Starting Surface CNC-machined parts: sharp burrs at tool exits, machining lines on faces. Need real cutting before any polish. Die-cast components: parting lines, cold shuts, and porosity. Light cut plus heavy smoothing; note that subsurface porosity can open up as material thins. Extrusions and stamped parts: mostly smoothing and edge rounding work. Anodizing-bound parts: pre-anodize finishing must be consistent — every swirl left behind shows through the coating. 2. Media Choice: Plastic First, Ceramic With Care For aluminum, bonded plastic media is the default cutter: its abrasive works without gouging, and its cushion protects edges. Precision ceramic (especially fine porcelain) excels for the smoothing-to-gloss stages when paired with the right compound. A full comparison logic is in our ceramic vs plastic media guide; both families are stocked in our plastic media and ceramic media catalogs. Precision ceramic media — the smoothing and pre-gloss stage workhorse Stage Media Objective Deburr / cut Bonded plastic triangles or tetrahedrons (medium) Remove burrs and machining lines without smearing Smooth Fine plastic or light-duty ceramic Uniform satin texture across all faces Pre-gloss Porcelain / polished ceramic with gloss compound Bright reflective finish ready for anodize or sale 3. Compound Discipline Aluminum-safe chemistry: strongly alkaline compounds attack aluminum surfaces; choose formulations labelled safe for aluminum and non-ferrous alloys. Keep it flowing: continuous or metered dosing prevents parts from rubbing dry — dry contact is where galling starts. Rinse promptly: spent aluminum slurry dries into hard white deposits that are difficult to remove later. 4. Cycle Control and Edge Protection Run short stages and measure. Aluminum edges degrade visibly faster than steel, so sample parts should be checked against a control piece at each stage boundary — especially threads, O-ring grooves, and mating flats. If your batch mixes thick and thin sections, consider separating them; thin features finish long before thick bodies do. 5. A Real Example: Motorcycle Alloy Brackets Alloy brackets after finishing: machining haze replaced by a clean, uniform satin-gloss — with machined lines still legible, not smeared away The goal state is visible here: casting and machining roughness gone, but engineered textures still crisp. That balance comes from gentle staged cutting rather than one aggressive run. 6. Common Defects and Fixes Defect Cause Fix Grey smeared streaks Media too aggressive; compound starved Step down to plastic media; increase dosing White powdery spots Slurry dried on surface Rinse immediately after cycle; never leave parts wet overnight Edges rounded over Cycle too long or mixed lot sizes Shorten stages; sort parts by section thickness Media lodged in holes Oversized media shape Smaller angle-cut media or mixed sizes per our small-holes guide 7. Dry Fast, Finish Clean Wet finishing ends with a drying step that matters more for aluminum than most metals: water sitting on fresh surfaces leaves mineral spotting within minutes. A spin dryer or absorbent corn-drying stage right after rinsing keeps the finish clean. Match your drying method to throughput using our finishing dryers, and send us tricky parts whenever a recipe needs proving. Aluminum parts fighting smears or stains? Send samples with photos of the defect. Our team will identify the cause and return a tested media-and-compound recipe. Contact Our Finishing Team Official website: www.surface-polish.com  |  Support email: info@surface-polish.com

How Acetate Eyewear Frames Are Mass Finished: From Tumbled Matte to Mirror Gloss Acetate frame polishing workflow • Barrel tumbling + bench touch-up • A repeatable process for eyewear production Freshly milled acetate frames come off the CNC looking chalky, with tool marks along the bevels and matte hinge seats. Turning them into the deep, wet-look gloss that defines premium eyewear is a staged process — and the heavy lifting belongs to mass finishing, not hand polishing. Here is the workflow eyewear factories use to finish hundreds of frames per batch with consistent results. Five-stage acetate frame finishing: tumble cut, tumble smooth, gloss, bench touch-up, clean & inspect Why mass finishing first? A tumbler treats every frame identically — including bridge undersides and temple curls that fingers and buffing wheels reach poorly. Hand work then finishes only what remains, cutting labor time dramatically per batch. 1. Start Point: What a Milled Frame Looks Like After milling: matte surface, visible tool marks on the bevel and hinge areas Cutter marks, light stress whitening around routed grooves, and an overall milky haze are normal at this stage. The goal of the following stages is to remove these without changing the frame’s geometry — the bevel angle and lens-seat fit must survive the process. 2. Stage 1–2: Tumble Cutting Then Smoothing Frames go into a rotary barrel or vibratory bowl filled with organic dry media. The first stage uses coarser walnut shell with a cutting wax to knock down tool marks; the second stage steps down to finer media for uniform smoothing. Long, slow cycles are the norm — acetate responds gradually, and rushing shows up as shiny flat spots on curved surfaces. Media: graded walnut shell first, then corncob or wooden pegs — see our walnut shell vs corncob guide. Machines: octagonal bamboo barrels give gentle cascading action — described in detail in our bamboo tumbling machine SOP. Checkpoints: hinge seats flat, tool marks gone, no whitening left in routed channels. 3. Stage 3: The Gloss Stage Fine corncob or wood pegs charged with polishing cream build the final luster. Compound is dosed little-and-often; overloaded media pastes acetate surfaces and dulls them. Filler-loaded bar compounds made for plastics work best — browse matching products in our finishing compounds range. 4. The Visible Difference After the tumble stages: uniform gloss, crisp edges, hinge seats smoothed Same frame before (top) and after (bottom) the full tumble cycle 5. Stage 4: Bench Touch-Up A single-station manual polishing bench handles what the tumbler cannot: tight fillets at hinges, lens-seat lines, and final edge refinement. Felt and muslin wheels with fine plastic-polishing waxes bring these zones up to the same gloss level as the tumbled surfaces — our single-station polishing machine guide covers the wheel, compound, and speed choices in detail. 6. Stage 5: Cleaning, Inspection and Common Pitfalls Clean: ultrasonic rinse removes wax residue from channels and engravings. Inspect: under diffused light, look for orange-peel texture, matte dead spots, or rounded bevels. Pitfall 1 — over-tumbling: cycles far beyond the recipe round the bevel and soften the front profile. Track cumulative hours. Pitfall 2 — dirty media: spent walnut loaded with acetate dust stops cutting and starts coating; refresh media per schedule. Pitfall 3 — skipping grit logic: jumping straight to the gloss stage polishes over tool marks instead of removing them. 7. Build Your Own Recipe Start from published recipes, then tune by sample runs: keep one marked control frame per batch and record cycle hours per stage. For machine options, compare our rotary barrel tumbling machines, and source consumables from our dry finishing media catalog. Setting up or upgrading your frame finishing line? Send frame samples and your target finish. We will return a tested stage-by-stage recipe with machines, media, and cycle hours. Contact Our Finishing Team Official website: www.surface-polish.com  |  Support email: info@surface-polish.com

Steel Media Burnishing Guide: How It Creates Mirror Shine and When Not to Use It Steel finishing media • Pins, balls & discs • Burnishing process, compound pairing and limits Steel media is unique in mass finishing: it is the only media that polishes almost entirely without cutting. Hardened stainless pins, balls, and discs rub against parts under compound pressure, compressing micro-peaks into a dense, bright surface — the burnished look buyers associate with quality hardware, watch parts, and jewelry findings. Used correctly it delivers shine no ceramic or plastic media can match. Used wrongly it smears soft metals, hides defects, and rusts your machine. This guide covers both sides. When steel media helps — and the three situations where it is the wrong choice Core idea. Steel media does not remove metal; it re-distributes it. That is why its shine is brilliant but its correction ability is nearly zero — every burr, mark, or machining line you want gone must be removed by an earlier cutting stage. 1. What Steel Media Actually Does Burnishing is a surface-compression process. Under the combined pressure of hundreds of hardened steel contacts per minute and an alkaline burnishing compound, surface asperities flow sideways and flatten. The result is a reflective, work-hardened surface with no material loss and virtually no dimensional change — which is exactly why steel media is preferred for precision parts where tolerances cannot move. 2. Shapes and Sizes of Steel Media Stainless steel pin media — the standard choice for magnetic finishers and intricate parts Dish-ball steel media in five sizes — larger shapes burnish flat faces faster Shape Best For Watch Out Pins (needles) Threads, holes, intricate channels — typical in magnetic finishers Can jam into very fine features below 0.5 mm Balls / dish balls Flat faces, ring bands, coin and logo surfaces Rolls away from edges; poor on recesses Discs / wedges Flat stampings, blade faces, edge work Sharp disc rims can leave micro-lines on soft alloys 3. Compound Pairing and Process Settings Alkaline burnishing compound: keeps steel bright, suspends soils, and provides lubricity. A mildly alkaline solution is the standard starting point. Media-to-parts ratio: begin around 5:1 to 8:1 by volume for bulk parts; higher ratios protect delicate parts from part-on-part contact. Cycle length: burnishing works fast once surfaces are pre-smoothed; run short cycles and inspect rather than committing to long runs. Rust discipline: never let wet steel media sit idle overnight without compound circulation — free water causes flash rust that transfers to the next batch. 4. Where Steel Media Shines (Literally) Watch cases and bracelets after ceramic pre-finishing. Jewelry findings, chains, and castings before plating. Machined stainless hardware needing a uniform satin-to-bright finish. Knife blades and tool faces where dimensional stability matters. 5. When NOT to Use Steel Media Three failure modes. (1) Soft metals — aluminum, brass, zinc smear and darken under steel pressure instead of brightening. (2) Rough surfaces — burrs and deep marks survive burnishing unchanged; cut them with ceramic first. (3) Mixed lots — steel media plus loose non-ferrous parts in one load leads to contamination, embedded particles, and dull patches. 6. Maintenance and Care of Steel Media Steel media lasts for years when kept clean. Rinse after each batch, store submerged in compound solution or fully dried, and re-clean periodically with a media cleaner compound when shine output drops. Rusty or blackened media must be cleaned before reuse — running parts with dirty steel transfers stains instantly. 7. Quick Selection Checklist Surface already smooth? If not — add a ceramic stage first. Part material harder than brass? Good candidate. Softer — reconsider. Need reach into threads and channels? Pins, ideally in a magnetic finisher. Need maximum flat-face gloss? Dish balls in a vibratory bowl. Browse our steel finishing media range, see how pins work inside our magnetic finishing machines, or revisit our guide on preventing part-on-part damage when loading valuable batches. Wondering if burnishing suits your parts? Send samples with your current finish. We will test steel-media burnishing against ceramic alternatives and share real results. Contact Our Finishing Team Official website: www.surface-polish.com  |  Support email: info@surface-polish.com

Mass Finishing for 3D Printed Parts: Deburring and Polishing Additive Manufacturing Components Additive manufacturing post-processing • Deburring, smoothing & polishing • FDM, SLA/DLP, SLS & metal AM parts 3D printing turns out parts close to final shape, but almost never close to final surface. Support scars, layer lines, partially fused powder, and sharp edges stand between a fresh print and a sellable or functional component. Mass finishing — vibratory, barrel, and magnetic finishing with the right media — is the most economical way to close that gap for batches of parts, without hand labor on every piece. Standard post-processing workflow for printed parts, with starting machine/media hints by AM process Why it matters. Hand sanding does not scale and reaches internal channels poorly. Mass finishing treats every part identically — including holes, channels, and lattice structures — and turns post-processing from a bottleneck into a repeatable production step. 1. Why 3D Printed Parts Need Post-Processing Every AM process leaves its own surface signature: FDM shows layer ridges and support contact points; resin prints (SLA/DLP) show support nubs and, uncured properly, tacky patches; SLS parts come out of the powder cake with a grainy, sintered skin; metal AM parts carry rough as-built surfaces plus support removal marks. Beyond cosmetics, these defects affect fit, fatigue performance, cleanliness for medical or food use, and how well the part takes paint, plating, or coating. Mass finishing addresses all of them mechanically, in batches. 2. Challenges by Printing Process AM Process Typical Surface Issues Mass Finishing Approach FDM (PLA, PETG, ABS) Layer ridges, support scars, stringing Vibratory or barrel tumbling with walnut shell/corncob or fine plastic media; gentle cycles protect thin walls SLA / DLP resin Support nubs, brittle green edges, glossy-to-matte patches Post-cure first, then vibratory finishing with fine plastic media; wet compound helps avoid chipping SLS / MJF nylon (PA12) Grainy sintered skin, trapped powder in holes Vibratory or barrel tumbling with ceramic or plastic media to smooth and seal the surface; improves dye uptake Metal AM (SLM/DMLS) Rough as-built texture, support attachment marks, spatter Centrifugal or vibratory finishing with ceramic media; staged compounds for deburr then refine 3. Machine Choices by Part Type Vibratory finishing machines: the default for batches of small-to-medium printed parts. Bowls handle delicate geometries gently; tubs accept longer or larger parts. Rotary barrel tumblers: economical smoothing of robust plastic prints; dry organic media doubles as drying and gloss stage. Magnetic finishing machines: needle media driven by magnetic fields reaches deep holes, threads, and intricate channels — ideal for tiny metal AM or resin parts with complex internals. Centrifugal machines: when cycle time or surface specs are demanding on metal parts; highest intensity per unit of floor space. Vibratory bowl finishing machine — the default choice for batches of printed parts Magnetic finishing machine — needle media reaches threads and internal channels 4. Media and Compound Pairing Part Material Recommended Media Compound / Notes PLA / PETG / ABS Walnut shell (24#–36#), then corncob fine for gloss Dry process; short cycles first — thermoplastics can round quickly SLA / DLP resin Fine plastic-bonded media (triangle or tetrahedron) Wet vibratory with mild compound; fully post-cure before tumbling SLS / MJF nylon Ceramic or plastic media, medium size Smoothing also improves dyeing results; blow out powder from holes first Metal AM (Ti6Al4V, 316L, AlSi10Mg) Precision ceramic (aggressive grade first, fine grade second) Two-stage process: deburr/refine, then polish; validate dimensional change 5. Step-by-Step Workflow 1. Remove supports & raft. Cut or break off supports before any mass finishing — media cannot remove thick support stubs efficiently. 2. Coarse deburr. Run an aggressive media stage to knock down support scars, burrs, and the worst layer lines. 3. Refine surfaces. A finer media stage smooths edges and uniformizes the surface for an even final appearance. 4. Polish (optional). For cosmetic parts, a polishing media or compound stage adds gloss — dry corncob for plastics, porcelain or steel media for metals. 5. Clean & dry. Rinse off wet compound residue or tumble in dry corncob to remove dust and oils. 6. Inspect & pack. Check finish consistency and critical dimensions against the first-article standard before packaging. 6. Common Defects and Fixes Defect Likely Cause Fix Parts stuck together or media lodged in holes Oversized media; overloaded bowl Use smaller media or mixed sizes; reduce load ratio — see our part-on-part damage guide Edges over-rounded, walls thinned Cycle too long or media too aggressive Shorten cycles, step down media grade, check dimensions each trial Dull, matte surface after polishing Dirty media; wrong compound dose Clean or replace media; dose compound little-and-often Powder trapped in SLS channels Insufficient pre-cleaning Blow out / ultrasonic pre-clean; use magnetic needle media for deep channels 7. Protecting Fine Features While You Finish The same contact that smooths a surface can also damage thin walls, fine threads, and sharp edges. Keep media-to-part ratios generous, avoid mixed hard/soft media unless intended, and always run a dimensional check on a marked sample batch. For consumable supply, browse our dry finishing media and ceramic media ranges. Scaling up your 3D printing post-processing? Send us your printed samples and target surface spec. Our team will run finishing trials and recommend the machine, media, and cycle with results. Contact Our Finishing Team Official website: www.surface-polish.com  |  Support email: info@surface-polish.com

Centrifugal Disc vs Centrifugal Barrel Finishing: Which High-Energy Machine Fits Your Parts? High-energy mass finishing comparison • Centrifugal disc & centrifugal barrel • Machine selection guide When vibratory finishing is too slow or too gentle for the result you need, the next step up in intensity is a centrifugal disc or a centrifugal barrel machine. Both multiply the effective force between media and parts, cutting cycle times dramatically on small, hard-to-finish components. But they reach that intensity in different ways — and that difference decides which machine suits your parts, batch sizes, and floor space. Working principles: open centrifugal disc bowl (left) vs sealed centrifugal barrel drums on a rotating turret (right) In one sentence. Centrifugal disc = fastest cycles with the batch always visible and easy to check; centrifugal barrel = the most intense sliding action with larger sealed batches. Both are the tools of choice when vibratory bowls would take hours to reach the same result. 1. Why High-Energy Finishing Exists Vibratory finishing is gentle and forgiving, but its abrasive action is limited by low contact pressure. Small or hard parts — fasteners, watch components, medical screws, precision gears, jewelry castings — often need far more rubbing energy to deburr, smooth, or pre-polish in a commercially acceptable time. Centrifugal machines solve this by spinning the process mass so that media presses against parts at many times the force gravity alone can provide, multiplying the rate of surface refinement while keeping the process controllable and repeatable. 2. How a Centrifugal Disc Machine Works A centrifugal disc machine is an open bowl with a powerful rotating disc at its base and stationary side discs or ribs. The base disc spins at high speed, setting media and parts into a toroidal (ring-shaped) rolling motion; the stationary sides force constant speed differences, so every part is continuously rubbed from all directions. Because the bowl is open, the operator can watch the batch, open the lid mid-cycle, and take out sample parts in seconds. Unloading is typically a tilt of the bowl or a bottom discharge door, followed by media separation on a screening tray. Centrifugal disc (vortex) machine principle: 1 fixed bowl, 2 rotary disc, 3 media and parts 3. How a Centrifugal Barrel Machine Works A centrifugal barrel machine mounts several sealed drums onto a rotating turret. As the turret spins, each drum also rotates on its own axis, so media and parts are held against the drum wall by centrifugal force and then continuously slide down the rising “shoulder” of the charge. This produces the most intense sliding/rubbing action of any batch mass-finishing process. The drums are sealed, so the process is quiet and clean; between cycles the drums swing out for loading, and finished batches are discharged through drum doors onto a separator. Centrifugal barrel finishing machine — drums open for loading 4. Side-by-Side Comparison Feature Centrifugal Disc Centrifugal Barrel Working principle Open bowl, spinning base disc + stationary side discs Sealed drums on a rotating turret (planetary motion) Batch visibility Fully visible; samples removable mid-cycle Sealed — check only at cycle end Action character Rolling toroidal flow; aggressive but controllable Maximum sliding/rubbing intensity Batch size Small to medium Medium to larger (sum of all drums) Unloading Bowl tilt or bottom door, quick manual discharge Drum doors discharge onto separator Typical parts Small flat/short parts: fasteners, stampings, jewelry, watch parts Small-to-medium bulk parts: gears, machined blanks, castings Process control Speed adjustable; visual process monitoring Turret and drum speeds adjustable; fully enclosed 5. Which Parts Fit Which Machine Choose centrifugal disc when: you need the shortest possible cycles on small parts, want to inspect or sample the batch during the run, or change part types frequently. Ideal for jewelry, watch cases, small stampings, and electronics hardware. Choose centrifugal barrel when: you need maximum smoothing or pre-polish intensity on robust small-to-medium parts in larger batches — machined blanks, forged or cast components, dental and medical implants (with validated processes), and cutting-tool blanks. Stay with vibratory when: parts are larger, fragile, or decorative surfaces must not mark each other — see our guide on choosing ceramic vs plastic media for gentler options. 6. Media and Compound Notes High-energy machines demand media that can take the extra force: precision-fired ceramic for aggressive cutting, plastic-bonded media for softer metals, and steel media where burnishing without material removal is the goal. Compound dosing is typically continuous or metered rather than batch-charged. Because contact pressure is much higher than in vibratory work, always run a dimension check on a sample batch before production — aggressive processes can move tolerances on thin or delicate features. 7. Selection Checklist and Next Step Define the objective: deburr, edge radius, surface refine, or pre-polish — and the target roughness if specified. Measure the part: smallest feature, thinnest section, and whether parts can touch each other. Size the batch: daily throughput decides whether a disc machine’s fast small batches or a barrel machine’s larger sealed batches fit better. Run a sample trial: send parts for a timed trial on both machine types and compare finish, cycle time, and dimensional change before buying. Browse our centrifugal disc finishing machines and centrifugal barrel finishing machines, or view the full finishing machine collection to compare all options. Disc or barrel? Let your parts decide. Send sample parts and your finish target. Our team will run comparative trials and recommend the machine, media, and cycle with real results. Contact Our Finishing Team Official website: www.surface-polish.com  |  Support email: info@surface-polish.com

Walnut Shell vs Corncob: How to Choose Dry Tumbling Media for Eyewear, Jewelry & Hardware Dry finishing media selection guide • Walnut shell & corncob • For dry tumbling, vibratory and centrifugal lines Dry organic media — crushed walnut shell and ground corncob — is the workhorse of dry tumbling and dry vibratory finishing. The two materials look similar in the bag, but they behave very differently in the bowl. Choosing the wrong one usually shows up as dull surfaces, stuck-on compound, or parts that are clean but not bright. This guide explains what each media does, how they compare, and how to pick the right grade for eyewear, jewelry, and precision hardware. Walnut shell vs corncob: material character, absorbency, grit ranges and typical applications Rule of thumb. Walnut shell cuts and brightens — use it when you need to remove marks, light oxides, or burrs while building gloss. Corncob dries and polishes gently — use it to absorb oils and polishing compound while producing a soft, streak-free luster on delicate parts. 1. What Dry Media Actually Does In a dry process there is no water or chemical solution doing the work. The media itself performs three jobs at once: it abrades (removing burrs, tool marks, and light tarnish), it carries compound (holding polishing wax against the workpiece), and it absorbs (soaking up oils, fingerprints, and spent compound so parts come out clean and dry). How aggressively a media abrades — and how well it absorbs — is exactly where walnut shell and corncob differ. 2. Walnut Shell Media: Character and Best Uses Walnut shell is crushed hard shell, typically from English walnuts. It is noticeably harder and sharper at the particle level than corncob, which makes it a light-cutting media rather than a pure polishing media. Walnut shell dry finishing media — hard, micro-cutting granules Light cutting action: removes light burrs, parting lines, tarnish, and heat-tint discoloration on metals and hard plastics. Gloss building: on brass, aluminum, zinc, and acetate it develops a bright, uniform sheen over 2–8 hour cycles as a typical starting range. Durable and reusable: holds its structure longer than corncob, so it suits longer production runs before replacement. Typical grades: coarse grits (6#–20#) for cleaning and deburring; finer grits (24#–40#) for smoothing and pre-polish. 3. Corncob Media: Character and Best Uses Corncob is the ground core of dried corn cobs — a soft, highly porous organic media. It cuts very little; its strengths are absorption and a gentle, burnishing polish. Corncob dry finishing media — soft, highly absorbent granules Gentle polishing: smooths micro-roughness and raises a soft luster without rounding edges or marking threads. Excellent absorbency: soaks up polishing wax, oils, and water — the standard choice for the final drying-and-gloss stage after wet finishing. Safe on delicate parts: the go-to media for jewelry, watch components, acetate eyewear, and painted or plated surfaces. Typical grades: medium (12#–20#) for general drying and polish; extra fine (30#–40#) for mirror-stage work on soft materials. 4. Side-by-Side Comparison Property Walnut Shell Corncob Cutting action Light to moderate — removes marks and tarnish Minimal — burnishing and smoothing only Absorbency Good Excellent Surface effect Bright, clean, slightly satin-to-gloss Soft, deep, streak-free luster Edge condition Lightly softened Preserved Media life Longer — resists breakdown Shorter — dusty as it wears Typical grit range 6# – 40# 12# – 40# Best applications Hardware, brass/aluminum parts, acetate frames, deburr + gloss Jewelry, watch parts, eyewear final gloss, drying after wet work 5. Pairing Media, Compound and Machine Both media carry polishing compound far better than they carry it dry — add wax or dry polishing cream in small, regular doses rather than one large charge. In rotary barrel tumbling, walnut shell at 50%–60% barrel fill is the usual starting point for cut-and-gloss stages, while corncob excels in the final gloss stage. For a worked example of stage-by-stage recipes, see our bamboo tumbling machine operation guide, and browse our full dry finishing media and finishing compounds ranges. 6. Selection Checklist by Application Acetate eyewear frames: walnut shell (24#–36#) with polishing wax to remove tool marks, then corncob (30#–40#) for the final gloss. Jewelry and watch parts: corncob extra fine with a touch of luster compound; avoid coarse walnut on delicate clasps and pins. Brass / aluminum hardware: walnut shell (12#–20#) to clear tarnish and burrs; corncob afterward if a softer cosmetic gloss is wanted. Threaded or tolerance-critical parts: corncob only, or walnut at fine grades and short cycles — check dimensions after the first trial run. Drying after wet vibratory finishing: corncob, always — its absorbency outperforms walnut for water and emulsion removal. 7. Run a Simple Media Trial Before Committing Media choice is ultimately empirical. Run a 2–4 hour trial with a marked sample batch: weigh the parts before and after, photograph surfaces under the same light, and check critical dimensions. If the surface is clean but not bright, move from corncob toward walnut (or add compound). If edges are rounding or dimensions are drifting, move toward corncob or a finer grade. Our rotary barrel tumbling machines work with both media families, and our team can recommend a starting recipe for your material and finish target. Not sure which media suits your parts? Send your part material, size, current surface condition, and target finish. Our finishing team will recommend the media grade, compound, and cycle to test first. Contact Our Finishing Team Official website: www.surface-polish.com  |  Support email: info@surface-polish.com

Single-Station Eco Manual Polishing Machine: Operation Manual, Maintenance Schedule & Finishing Recipes Model Series: SPM-ECO-1000 • Eco-Friendly Dust-Controlled Buffing Workstation • Optical & Hardware Edition The JINTAIJIN SPM-ECO-1000 single-station eco manual polishing machine is an eco-friendly precision buffing workstation engineered for high-gloss finishing of cellulose acetate eyewear, optical parts, jewelry, watch cases, and fine hardware. A 1.5 kW stepless VFD spindle (0–3,600 RPM), high-velocity negative-pressure dust extraction (1,200–1,500 m³/h), 5–10 µm multi-pocket polyester filtration, and a 15 L slide-out recovery drawer deliver superior surface gloss with zero airborne dust. This manual covers product specifications, mechanical architecture, essential safety regulations, installation and pre-commissioning, the full standard operating procedure (SOP), dust filtration and shaker operation, preventive maintenance, troubleshooting, and factory spare parts. If you are comparing equipment options first, review our finishing machine collection or the wider grinding & finishing machine range. MSDS Download (English, original document). Material Safety Data Sheet for JINTAIJIN resin abrasive polishing media — provided exactly as issued, unmodified. Download MSDS (EN) — PDF Equipment overview & capability. The SPM-ECO-1000 integrates high-torque buffing spindle mechanics with a self-contained dust extraction blower and high-efficiency filtration matrix for industrial surface polishing. Featuring a stepless VFD spindle, negative-pressure suction hood, mechanical dust shaker lever, and a sealed 15-liter recovery drawer, it suits acetate/propionate eyewear frames, optical parts, jewelry, watch cases, and fine hardware finishing. 1. Technical Parameters & Specifications The table below lists the standard engineering configuration of the SPM-ECO-1000 single-station eco manual polishing machine. Technical Parameter Engineering Value / Range Specification Notes Spindle Motor Power 1.5 kW / 2.0 HP (Continuous Duty S1) High-Torque Induction Motor with VFD Inverter Spindle Speed Range 0 – 3,600 RPM (Stepless Regulated) Digital RPM Display & Precision Potentiometer Dial Dust Extraction Blower 0.75 kW (High-Pressure Backward Centrifugal) Airflow Rate: 1,200 – 1,500 m³/h (700 – 880 CFM) Inlet Suction Velocity ≥ 18.0 m/s at Extraction Throat Direct Particle Pull with Zero Ambient Leakage Filtration Rating & Media 5 – 10 µm Needle-Punched Polyester Fabric ≥ 98.5% Dust Separation Rating (Multi-Pocket Array) Dust Collection Capacity 15 Liters Slide-Out Steel Drawer Dual Quick-Release Toggle Clamps & EPDM Seal Buffing Wheel Range Ø150 mm – Ø250 mm (6" – 10" Diameter) Core Arbor Bore: Ø16 mm or Ø25 mm Spindle Shaft Specification Precision Solid Alloy Steel Ø25 mm M16 Left-Hand Reverse Thread; Runout ≤ 0.02 mm Workstation Lighting 24W Shadowless Industrial LED Bar Illuminance ≥ 1,200 Lux at Tabletop Working Plane Power Supply & Voltage 220V 1-Phase / 380V 3-Phase, 50/60 Hz Chassis Grounding Resistance strictly < 4.0 Ω Acoustic Noise Rating ≤ 72 dB(A) at 1.0 m operator distance Compliant with ISO 11202 & OSHA 1910.95 Machine Dimensions / Weight 850 × 750 × 1,350 mm (L×W×H) | 115 kg Heavy-Duty Welded Frame + 4 Leveling Footpads 2. Mechanical Architecture & Subsystem Identification The machine integrates a buffing spindle, negative-pressure extraction, multi-pocket filtration, and a sealed recovery drawer into one dust-controlled workstation. The diagram below identifies all primary structural components and their exact English technical terms. Figure 1: Overall System Architecture, Structural Layout, and Key Component Identification 2.1 Core Subsystem Breakdown # Component Functional Description & Operational Role 1 Precision Spindle Arbor Solid Ø25mm alloy shaft with M16 reverse-thread nut and clamping flanges. 2 Aerodynamic Suction Hood Wide negative-pressure intake hood pulling dust directly behind the wheel. 3 Dust Recovery Drawer 15-liter slide-out steel bin with dual quick-release airtight toggle latches. 4 Multi-Pocket Filter Chamber Houses 4 polyester cloth filter bags (5–10µm) with ≥98.5% separation rating. 5 Polycarbonate Safety Visor Hinged, high-impact transparent shield protecting operator from flying swarf. 6 24W Shadowless LED Lamp Daylight-spectrum LED bar illuminating the polishing contact plane (≥1200 Lux). 7 Control Console Front panel with E-Stop, Power/Suction/Light switches, and VFD RPM dial. 8 Leveling Footpads Four adjustable heavy-duty rubber-cushioned M16 anti-vibration feet. 9 Dust Shaker Lever External side lever linked to internal grid to dislodge filter cake into the drawer. Figure 2: Detail Zoom 1 — Precision Polishing Spindle, Bearing Housing, Flange Clamping, and Reverse-Thread Locking Nut Figure 3: Detail Zoom 2 — Single-Port Aerodynamic Extraction Hood, Dual-Vortex Airflow, and Particle Capture Dynamics Figure 4: Detail Zoom 3 — Multi-Pocket Fabric Filter Matrix, Mechanical Shaker Agitation Grid, and Slide-Out Recovery Drawer Figure 5: Detail Zoom 4 — Industrial Operator Control Console, Electrical Switches, VFD Speed Regulator, and Emergency Stop Interface 3. Essential Safety Regulations & Hazard Controls DANGER — severe mechanical entanglement hazard: NO GLOVES. STRICT PROHIBITION OF GLOVES: NEVER wear gloves (cotton, leather, rubber, or nitrile), loose clothing, neckties, rings, or wrist jewelry during polishing spindle operation. The high-speed rotating spindle and cotton buff will instantly grab textile fibers and drag the operator’s hands into the arbor within milliseconds. Long hair MUST be securely bound in a protective cap. 3.1 Mandatory Personal Protective Equipment (PPE) Eye & Face Protection: ANSI Z87.1 / EN 166 Grade B certified safety goggles or face shield. Respiratory Protection: NIOSH N95 or EN 149 FFP2 particulate respirator for fine dust. Hearing Protection: Industrial earplugs or earmuffs (NRR ≥ 22 dB) during extended shifts. Apparel & Footwear: Snug workwear with elastic cuffs; steel-toe anti-slip safety shoes. 3.2 Combustible Dust & Static Grounding Protocols Grounding: Cellulose acetate, acrylic, and polishing wax generate combustible fine dust. Ensure chassis grounding resistance is strictly < 4.0 Ω to dissipate static charge buildup. Spark Control: NEVER polish spark-producing ferrous metals (steel/iron) without prior complete cleanout of the filtration chamber and dust drawer. 4. Installation & Pre-Commissioning 1. Leveling. Place machine on a level concrete floor. Adjust 4 leveling footpads until the tabletop is level in all axes, then lock jam nuts. 2. Electrical. Connect to dedicated branch circuit (16A breaker for 220V 1-Phase; 10A breaker for 380V 3-Phase). Secure PE ground wire (<4Ω). 3. Rotation. Buffing wheel MUST rotate clockwise downward toward operator. If rotation is reversed on 3-phase units, swap incoming lines L1 and L2. 4. Wheel Mounting. Slide inner flange onto shaft → Mount wheel → Slide outer flange → Hand-thread M16 reverse nut → Tighten firmly with spanner (45–50 N·m). 5. Standard Operating Procedures (SOP) & Finishing Follow this streamlined 4-stage workflow to guarantee repeatable, mirror-grade finishing and ensure maximum operator safety. Figure 6: Standard Operating Procedure (SOP) 4-Stage Operational Workflow & Recommended 4:00 – 6:00 Safe Wheel Contact Arc 5.1 Daily Startup Sequence 1. Power. Turn ON Main Power isolator switch (green indicator illuminates). 2. Suction. Press DUST SUCTION button and verify strong negative air draw at the hood throat. 3. Lighting. Turn ON LED Work Light switch to illuminate the contact plane. 4. Spindle. Press SPINDLE START and dial VFD speed potentiometer to target RPM (2,000–2,400 RPM for acetate; 3,000 RPM for metal). 5.2 Workpiece Contact Arc & Kickback Prevention WARNING — kickback danger & safe contact zone. MANDATORY CONTACT ZONE (4:00 TO 6:00 ARC): Always present the workpiece against the LOWER QUADRANT of the wheel (between 4:00 and 6:00). NEVER polish above the centerline (12:00 to 2:00 zone) — the wheel will violently snatch and throw the workpiece forward (kickback hazard). Maintain light, steady, tangential pressure. 5.3 Eyewear & Precision Hardware 3-Stage Finishing Protocol Process Stage Recommended Wheel Compound Speed Surface Objective Stage 1 (Coarse Cut & Deburr) Spiral cotton / sisal wheel Brown Tripoli compound 2,200–2,400 RPM Removes CNC milling tool marks and burrs. Stage 2 (Smooth & Level) Yellow treated cotton wheel Green Chromium Oxide compound 2,000–2,200 RPM Buffs frame bevels and bridge into a smooth satin finish. Stage 3 (Mirror Finish) Soft unstitched muslin wheel Blue Luster or White Diamond wax 1,800–2,000 RPM Polish with light touch for optical mirror gloss. Compound tip — dedicated wheels per stage. Always use a dedicated buffing wheel per compound grade. A wheel contaminated with coarse Tripoli will transfer swirl marks into the final mirror stage. Rake wheels clean between batches. 5.4 End-of-Shift Shutdown Routine Stop spindle → Run suction for 30s to purge ductwork → Turn OFF suction, light, and power → Pump dust shaker lever 6–8 times into drawer. 6. Dust Filtration, Shaker Operation & Recovery 1. Recovery Drawer — empty daily. Turn OFF machine. Release dual quick-latches, slide 15L drawer out, empty swarf into waste/recycling bin, wipe EPDM gasket clean, and clamp latches airtight. 2. Shaker Agitation — every 4 hours. With suction fan completely OFF, grasp external side shaker lever and pump vigorously 6–10 times. Internal grid shakes caked dust down into the drawer. 3. Swarf Recovery — precious metal reclamation. The sealed collection drawer enables 100% dry reclamation of gold, silver, brass, and titanium polishing swarf without slurry contamination. 7. Preventive Maintenance & Troubleshooting 7.1 Preventive Maintenance Schedule Maintenance Frequency Mandatory Inspection & Service Procedures Daily (Every Shift) Empty 15L recovery drawer; clean PC visor; pump filter shaker 6–8 times; check wheel wear. Weekly (40 Hours) Inspect spindle arbor runout; check drive belt tension; inspect EPDM drawer gasket seal. Monthly (160 Hours) Inspect filter bags for tears or caking; verify ground bond (<4.0 Ω); check electrical terminals. Semi-Annually (1,000 Hours) Lubricate spindle bearings with 3–5g high-speed grease (Mobil Polyrex EM); check VFD. Annually (2,000 Hours) Replace complete set of multi-pocket filter bags (SPM-FLT-1004); inspect motor dynamic balance. 7.2 Comprehensive Troubleshooting Matrix Fault Symptom Probable Root Causes Corrective Action & Resolution Machine will not power ON Main breaker tripped; E-Stop locked down; blown fuse. Reset breaker; rotate E-Stop clockwise to release; check fuse. Motor hums but will not spin Phase loss on power line; VFD fault; arbor jam. Verify incoming line voltages; check VFD code; clear arbor. Excessive machine vibration Unbalanced buffing wheel; loose M16 lock nut. Dress or replace buffing wheel; tighten M16 nut to 45 N·m. Weak suction airflow at hood Filter bags caked; drawer unlatched; duct clog. Pump shaker lever 10 times; clamp drawer tight; clear duct. Workpiece burning (Acetate) RPM too high; excessive pressure; dry buffing wheel. Reduce speed to 2,000–2,400 RPM; use light touch; apply wax. Swirl marks / haze on surface Wheel contaminated with coarse compound/grit. Rake wheel clean; use dedicated buffing wheel per compound. Acoustic squeal / grinding noise Dry spindle bearings; loose drive belt rubbing frame. Grease bearings with Mobil Polyrex EM; adjust belt tension. 8. Spare Parts & Factory Service Contact 8.1 Genuine Factory Spare Parts Catalog Part Description & Specifications Factory Part No. Application & Replacement Notes Multi-Pocket Polyester Filter Bag Set (4 Pockets, 5–10µm) SPM-FLT-1004 Replace every 12–18 months depending on duty cycle Polycarbonate Safety Visor Shield (3mm High-Impact PC) SPM-SHD-PC01 Pre-drilled mounting holes with hinge hardware NSK High-Speed Spindle Deep Groove Ball Bearings (Pair) BRG-6205-2RS Pre-greased, double rubber sealed (25×52×15 mm) Over-Center Toggle Clamps with Rubber Spindle Pad CLP-TGL-GH403 Heavy-duty zinc-plated steel for recovery drawer M16 Left-Hand Reverse Thread Hex Nut & Clamping Flanges NUT-M16-LH02 Precision balanced alloy steel hardware set Mushroom Head Twist-to-Reset Emergency Stop Pushbutton SW-ESTOP-XB2 Standard 22mm panel mount, 1NC contact block 24W Industrial Shadowless Daylight LED Tube Luminaire LED-T8-24W-6.5K 6500K Color Temperature, IP54 dust resistant EPDM Foam Airtight Recovery Drawer Sealing Gasket GSK-EPDM-1505 Self-adhesive oil and wax resistant sponge rubber 8.2 Manufacturer Warranty & Official Contact The SPM-ECO-1000 is backed by a 12-Month Manufacturer Warranty covering motor, blower, VFD, and structural frame under normal industrial operation. For technical assistance, custom buffing process development, replacement wheels, or spare parts inquiries, contact our engineering support team. We also offer OEM/ODM customization and consumables supply for the full single-station polishing machine range — browse our finishing compounds and consumables categories for stage-matched waxes, compounds, and buffing wheels. Need a dust-controlled buffing workstation for your parts? Send your part material, size, current surface condition, and target finish. Our finishing team can recommend the right machine, wheels, compound, and test process. Contact Our Finishing Team JINTAIJIN POLISH MACHINERY CO., LTD. • Official website: www.surface-polish.com  |  Support email: info@surface-polish.com  |  ISO 9001:2015 & CE Certified

Double-Deck Bamboo Tumbling Machine: Standard Operating Procedure, Control Guide & Finishing Recipes Model Series: SP-TB4 / SP-TB8 • Precision Dry Tumbling System • Official operation manual The SP-TB Series double-deck bamboo tumbling machine is a precision dry tumbling system designed for high-gloss finishing of premium eyewear frames (acetate, propionate), fine hardware, jewelry, and luxury plastic or wood components. Its octagonal, seasoned bamboo barrels provide natural thermal buffering, gentle wax absorption, and a soft cascading action that delivers mirror-like surfaces without edge distortion. This manual covers machine structure, control panel operation, the full 6-step standard operating procedure (SOP), proven dry tumbling recipes, preventive maintenance, and quick troubleshooting. If you are comparing equipment options first, review our rotary barrel tumbling machines range or the wider finishing machine collection. Equipment overview & capability. The two-tier vertical architecture saves floor space while doubling batch output. Each barrel is built from aged natural bamboo staves with stainless steel ventilation screens, and the drive system is protected by a full-height yellow wire mesh guard. The machine is suited to acetate/propionate eyewear frames, fine hardware, jewelry, and luxury plastic/wood components. 1. Technical Parameters & Configuration The table below lists the standard engineering configuration of the SP-TB4 (4-barrel) and SP-TB8 (8-barrel) models. Technical Parameter Engineering Specification / Configuration Structure / Barrels Double-Deck (2 Tiers), 4 or 8 Octagonal Bamboo Barrels Barrel Material Aged Natural Bamboo Staves with SS Ventilation Filter Screens Main Motor / Power 2.2 kW / 3.0 HP High-Torque Heavy-Duty Motor (380V 3-Phase / 220V 1-Phase) Tumbling Speed 28 – 35 RPM (Optimized Gravity Cascade Angle: 45°–50°) Control System Digital Microprocessor Timer (0–99.9 h/m), Start, Stop, JOG Inching, Reset Safety Enclosure Full-Height Industrial Yellow Wire Mesh Guard Enclosure Discharge System Heavy-Duty Middle Galvanized Pull-Out Receiving Hopper Tray Official Support Website: www.surface-polish.com | Email: info@surface-polish.com 2. Machine Structure & Component Nomenclature The machine layout features a space-saving two-tier vertical architecture. The diagram and table below identify all primary structural components and their exact English technical terms. Figure 1: Machine Structural Layout & Subsystem Nomenclature # Component Functional Description & Operational Role 1 Bamboo Tumblers Dual-deck octagonal barrels (#3, #4 upper; #7, #8 lower) for gentle cascading dry polishing. 2 Clamping Bars & Latches Heavy-duty steel compression bars with quick-acting toggle clamps to secure hatch doors. 3 Ventilation Mesh Screens Perforated stainless steel screens to dissipate internal frictional heat and vent micro-dust. 4 Receiving Hopper Drawer Middle heavy-gauge galvanized collection tray for clean, rapid workpiece/media discharge. 5 Structural Steel Chassis Rigid, vibration-damped welded steel frame supporting dual-tier drive loads. 6 Yellow Safety Mesh Enclosure Full-height yellow wire mesh cage isolating transmission belts, pulleys, and drive chains. 7 Electric Control Cabinet Dust-proof electrical enclosure housing the pushbutton station, safety locks, and LED timer. 3. Control Panel & Operator Interface The front-mounted control station allows precise cycle management, automated timed shutoff, and micro-positioning (JOG) for loading and unloading. The digital timer automatically stops the machine when the programmed cycle is complete. Figure 2: Electrical Control Cabinet Interface & Button Layout Control Element Hardware Type / Color Operating Logic & Standard Action Power Lamp Red Pilot Lamp (Top) Illuminates continuously when the 3-phase/single-phase main power supply is energized. Start Button Green Pushbutton Latches the main magnetic contactor to start continuous automatic tumbling cycle. Stop Button Red Pushbutton Immediately de-energizes the drive motor and halts all barrel rotation. JOG / Inching Yellow Pushbutton Momentary run: rotates barrels only while pressed. Used to align doors for loading/unloading. Timer Reset Blue Pushbutton Resets the digital timer accumulator back to zero (00:00) for a new cycle run. Digital LED Timer Microprocessor Controller Digital display with +/- setting buttons. Automatically shuts down the machine upon cycle completion. CAUTION — JOG (inching) safety rule. Always use the yellow JOG button to rotate barrel doors into position. NEVER attempt to rotate barrels by hand when the motor is stopped or energized, as residual torque may cause pinch hazards. 4. Standard Operating Procedure (6-Step SOP) Follow this streamlined 6-step workflow to guarantee repeatable, mirror-grade polishing and ensure maximum operator safety. Figure 3: Standard Operating Procedure (6-Step Dry Tumbling Workflow) Step 1: Pre-Start Inspection & JOG Positioning. Verify the yellow safety cage is secured. Turn on the main isolator. Press the yellow JOG button intermittently until the target barrel door faces vertically upward (12 o’clock position). Step 2: Load Polishing Media & Workpieces. Release the red toggle latches, remove clamping bars, and open the hatch. Fill the barrel to 50%–60% total volume with walnut shells or corncobs. Add workpieces at a strict 3:1 to 4:1 media-to-workpiece ratio. Step 3: Apply Polishing Wax / Rolling Cream. Distribute specialized polishing wax or rolling oil evenly across the media (15–30 g per batch). Ensure the ventilation screens are clean and unclogged. Step 4: Secure Clamping Bars & Latches. Reinstall the barrel hatch door. Position the steel clamping bars and engage the red toggle clamps until firmly locked. Verify zero clearance around the door gasket. Step 5: Program Digital Timer & Press START. Press the blue TIMER RESET button. Set the desired cycle duration on the digital timer (e.g. 12.0 hours). Press the green START button. The machine runs continuously and auto-stops upon completion. Step 6: Discharge & Workpiece Separation. Slide the galvanized receiving hopper drawer directly under the target barrel. Use the JOG button to rotate the barrel door downward (6 o’clock position). Release the latches, open the hatch, and discharge the contents into the hopper for screening. 5. Dry Tumbling Process Recipes & Media Matrix Dry tumbling relies on progressive multi-stage micro-cutting and buffing. Use the proven recipe chart below for acetate eyewear, luxury plastics, and precision metals. Cycle times are typical starting ranges and should be confirmed with sample parts. Process Stage Recommended Media Polishing Compound Cycle Time Surface Objective 1. Rough Cutting Coarse Walnut Shell (16#–20#) Rough Cut Wax / Gray Paste 8 – 14 Hours Removes CNC milling marks, burrs, and parting lines. 2. Medium Smoothing Medium Walnut Shell (24#–36#) Medium Polish Cream / Brown Wax 10 – 16 Hours Smooths micro-scratches, creates uniform satin finish. 3. Fine Glossing Fine Corncob (20#–40#) / Bamboo Pegs Fine Buffing Oil / White Wax 12 – 18 Hours Enhances surface depth, semi-bright luster, prepares for mirror finish. 4. High Mirror Luster Micro Corncob (40#–60#) / Hard Pegs Mirror Finish Glaze / Blue-Green Wax 14 – 24 Hours Produces flawless, ultra-deep optical clarity & mirror reflection. Pro tip — tumbling volume & density control. Optimal tumbling efficiency occurs at 50%–60% total barrel fill. Never underfill (below 40%, risks severe impact damage) or overfill (above 70%, prevents cascading action and causes matte dead spots). Media and compound selection is the largest variable in dry tumbling results. Browse our dry finishing media range for walnut shell and corncob grades, or review finishing compounds for stage-matched waxes and glazes. 6. Preventive Maintenance & Quick Troubleshooting 6.1 Routine Maintenance Schedule Daily check: inspect door toggle clamps and rubber gaskets for wear. Clear accumulated dust from ventilation mesh screens using a soft brush or shop vacuum. Weekly check: check drive belt tension inside the yellow mesh cage (approx. 10–12 mm deflection under firm thumb pressure). Inspect chain lubrication. Monthly service: apply NLGI #2 lithium grease to all pillow block bearings via grease nipples. Inspect bamboo staves for tightness; tighten mounting bolts if loose. 6.2 Quick Troubleshooting Matrix Fault Symptom Probable Root Cause Corrective Action / Solution Machine fails to start when pressing START Main power off / emergency halt engaged / timer not set / fuse blown Check red power lamp, release stop button, reset timer, check supply breaker. JOG button works but START does not latch Timer timed out / contactor auxiliary contact fault Press blue Timer Reset button; inspect contactor wiring inside control box. Excessive noise or vibration during run Worn pillow block bearing / loose drive chain / unbalanced load Lubricate or replace bearings, adjust chain tensioner, ensure even media filling. Media dust leaking during operation Worn hatch sealing gasket / toggle clamps not fully locked Inspect and replace silicone gasket; adjust clamping bar latch tension. Workpieces have uneven or poor luster Improper media ratio / insufficient wax / clogged mesh screens Adjust media-to-part ratio toward 4:1; clean ventilation screens to prevent overheating. 7. Technical Support & Custom Process Development For technical assistance, custom tumbling process development, replacement barrels, or spare parts inquiries, contact our engineering support team. We also offer OEM/ODM customization, polishing compounds and media supply, and wear parts for the full SP-TB series. Need a custom dry tumbling process for your parts? Send your part material, size, current surface condition, and target finish. Our finishing team can recommend the right machine, media, compound, and test process. Contact Our Finishing Team Official website: www.surface-polish.com  |  Support email: info@surface-polish.com