An end-effector builder in Tokyo, Japan supplying robotics and automation has a pocketed 7075 aluminium tooling plate where the edges must be deburred but the dowel holes and flatness cannot move. SurfacePolish supplies finishing machines, media and compounds across borders and offers a free sample trial, in which the plate is shipped to Xiamen and returned with observed results and a proposed media, compound and cycle direction for the buyer to assess. This brief is written for a buyer in Tokyo working on robotics and automation; it describes equipment, media and a scoped sample review, not a local polishing service.
What does the finishing step actually have to deliver before the next operation, whether that is assembly, anodising, painting or a functional test, and who defines that requirement?
What is the smallest hole, slot, keyway or cross-drilling the charge must not enter or plug, and how will a lodged medium be detected and removed?
Which alloys and tempers run through the shop, and how will media, machines and compounds be purged between aluminium, stainless and steel work?
Automation work mixes scales in a way that catches buyers out. The same shop may finish a 40 kg robot base casting and a 30 g gripper jaw, and a machine sized for the casting will over-work the jaw. Load ratio, the mass of parts against the mass of the charge, is the variable that usually decides whether small parts come out even or rounded. Screen the family on its extremes: the heaviest part, the largest envelope, the thinnest unsupported wall and the smallest part that must meet the same appearance. Long linear-axis beams and thin cover plates distort under their own weight in a deep bed, while heavy castings need a chamber large enough to keep them moving. A shortlist built on the average part will miss both ends of the range.
Rotary barrel finishing is the gentle end of the range. Parts tumble in a closed drum, usually with plastic or light ceramic media and a generous compound flow, so direct impact is limited and small fragile components such as spools, pins, bushings and screw-machine parts survive. Cycles are long and the drum hides the work while it runs. Magnetic finishing works differently: a small charge of pin-shaped or fine media is driven by a moving field into narrow gaps, small bores and fine internal radii that tumbling media cannot enter, which suits precise items such as orifice plates, small valve spools and fine slot arrays. Its working envelope is small, the pins are a lodging risk in the features they are chosen to reach, and the surface signature differs from tumbling, so a roughness value from one route does not transfer to the other.
| Machine route | Where it fits | What it will not do |
|---|---|---|
| Grinding finishing machine | Taking off a heavy machining burr, dross or a defined stock layer before a refinement pass on robust steel and stainless work | High removal energy cuts functional edges fast and demands a tighter assessment of what may be removed and how much |
| Vibratory finishing machine, bowl type | General deburring and refinement of machined housings, plates and brackets that fit and can tumble without racking, with easy mid-cycle inspection | Continuous part-on-part contact and no access to deep internal passages; thin plates and finished mounting faces need separation |
| Magnetic finishing machine | Fine deburring and light refinement of small precise features such as small bores, narrow slots and fine internal radii | Small working envelope that excludes housings and long parts, with pin media that can lodge in the fine features it reaches |
| Tub vibrator | Long parts such as linear-axis beams, manifolds and welded frames that cannot rotate in a bowl | Lower energy per unit area so heavy burrs take longer, and large tubs need floor space and a reliable part support method |
Compound carries debris away, keeps the media from loading and buffers the chemistry against the metal. Alkaline and neutral families are common for general deburring and cleaning; acidic families may be chosen where a descale or brightening effect is wanted; silicate-bearing products can leave a tenacious film that is hard to remove from a bore or a sealing land. On aluminium an effective corrosion inhibitor usually matters, because the wrong chemistry darkens the surface during or after the cycle. Concentration, flow and temperature shift the result, so dosing should be metered rather than judged by eye, and rinse water hardness, chloride content and suspended solids all affect foaming and what remains behind. Where an anodise or paint step follows, the film and smut left by the cycle become the buyer's problem, so define how the surface will be checked.
| Media | Best fit | Watch out for |
|---|---|---|
| Plastic cylinders and cones in a harder, denser grade | Longer cycles on mixed batches of small fittings and screw-machine parts where a repeatable light edge break is wanted without ceramic impact | Can float or segregate by shape in a bowl, and cylindrical forms can wedge in slots, keyways and cross-drillings |
| Dry media such as walnut shell and corn cob | Drying assistance and light surface polish after a wet cycle, particularly on parts with pockets and threads that must not stay wet | Does not deburr or refine metal significantly, generates dust, and must not be treated as a cleanliness step |
| Magnetic finishing pins and fine magnetic media | Small precise items such as spools, orifice plates, small valve parts and fine slot arrays where tumbling media cannot reach the feature | Limited working envelope, pins lodge in the same fine features they are chosen to reach, and the surface signature differs from tumbling |
| Heavy-cut ceramic, angle-cut triangles in a coarse size class | Removing a substantial milled or turned burr from open external edges and pockets on steel and stainless automation parts before a refinement stage | Cuts functional edges and corners aggressively, leaves a coarse surface on aluminium, and lodges in slots whose width approaches the media section |
Edge rounding beyond limit is the failure that most often turns a finished automation part into scrap, because the features that round first are the ones that set position. A bearing bore lip, a dowel hole edge, a seal groove corner or the edge of a ground mounting land can lose a fraction of its geometry under a high-energy charge and still look uniform and polished. Coarse or dense media, an over-long cycle and a heavy load ratio all accelerate it, and aluminium rounds faster than stainless under the same conditions. Because the damage is invisible to a casual look, checking has to be deliberate: measure the feature before and after with an optical comparator, a radius gauge or a moulded replica, and compare the result with the limit on the drawing. Masking, a shielding fixture or a gentler medium are the usual mitigations to test.
| Failure mode | Likely cause | How to catch it |
|---|---|---|
| Rust spotting on stainless parts appearing hours or days after finishing | Ferrous transfer from steel media, a machine or tooling that has held carbon steel, or insufficient corrosion inhibition and drying | Inspect after a defined dwell time rather than immediately, look for pinpoint spots on and near edges, and trace the media and machine history for the lot |
| Grey aluminium smear transferred onto stainless parts in a shared batch | Aluminium fines retained in media, compound or the machine sump after an aluminium lot, with no purge before the stainless lot | Check stainless surfaces under angled light for a dull grey film, review the changeover record, and inspect the charge and sump for retained fines |
| Threads rounded, galled or opened out by edge finishing | Media working the thread crest during a long or high-energy cycle, with no plugging or masking on the hole | Run go and no-go thread gauges on every sampled hole, inspect the crest at magnification, and confirm that plugs or masks were fitted and removed |
| Compound film, smut or tenacious residue left on a face or in a bore | A film-forming or silicate-bearing compound, insufficient rinse volume, or drying a part before it is genuinely clean | Magnify the suspect surface, wipe a defined area with solvent against a clean reference, and confirm with the buyer's own cleanliness method |
Tokyo's manufacturing is concentrated in the eastern wards rather than spread evenly across the metropolis. Ota City states that the number of manufacturing establishments in Tokyo is largest in Ota, and describes itself as a metalworking town of small and medium firms; about 3,500 manufacturing establishments are counted there (2021 Economic Census). The ward's core 'base technologies' are cutting, pressing, forming, grinding, casting, forging and plating, and it reports that these support fields extending from automobiles to medical equipment and aerospace, with Naka-Ikegami concentrating industrial equipment makers and Omori-nishi concentrating electro-mechanical manufacturers. Multi-product, small-lot production and prototyping and R&D work are named as strengths of the district.
The nearest part of that base to this brief is aerospace: Ota City states that the ward's base technologies support fields 'from automobiles to medical equipment and aerospace', and that local firms have entered aerospace and electronics.
Ota's base-technology list explicitly includes grinding and plating, and the ward reports that its firms are specialised by process step and linked across steps to achieve high-precision, compound machining and short lead times. In a district built on multi-product, small-lot work and prototyping, deburring, edge condition and pre-plating surface cleanliness are process-step decisions rather than finishing afterthoughts, because each downstream firm in the chain inspects what the previous step delivered.
Because Ota's supply chain is organised by process step, a Tokyo buyer should decide first which step owns the edge condition — the machining shop, the grinder or the plater — and specify burr and edge limits on the drawing so the requirement is not re-negotiated at each hand-off.
Freight context: Port of Tokyo (東京港) — container terminals including Oi, with the port's hinterland covering the 40-million-person Greater Tokyo area, Shinetsu and southern Tohoku, Haneda Airport (羽田空港, Tokyo International Airport), located in Ota City's waterfront. The Port of Tokyo is described by the Tokyo Metropolitan Government as an urban general port handling goods needed by the metropolis' industry and residents, with imports accounting for two thirds of cargo volume by in/out direction. The Tokyo Metropolitan Government reports Port of Tokyo container throughput of 4.86 million TEU for 2025, 3.3 per cent above 2024, so containerised receipt of machines and dispatch of sample parts runs through the same port complex.
Chinese industrial machinery entering Japan is classified under the Customs Tariff Law, whose harmonised schedule sets the classification and the General Rate; the Temporary Tariff Measures Law sets a Temporary Rate for certain products, and where the WTO rate or an EPA rate for the goods is lower, that lower rate is applied. The applied rate therefore depends on the exact commodity code, and on whether an economic partnership agreement covers the goods and their origin, so a landed-cost figure has to be confirmed against the specific machine before it is quoted. Japan Customs' monthly country table for August 2026 records exports to China of 1,809,133 million yen and imports from China of 2,361,239 million yen, the largest single-country line in the Asian table, with imports from China up 22.5 per cent year on year.
Documentation and technical communication are Japanese-language in practice: JISC states that the documents submitted for JIS certification-body accreditation must be written in Japanese, and drawings, inspection sheets and purchase specifications from Japanese buyers are normally issued in Japanese. Import declarations are filed in triplicate and importers commonly use licensed customs brokers, so the commercial invoice, packing list and origin documents must be complete and consistent with the declared commodity code. As general industry practice in Japan, industrial buyers qualify a supplier on documentation, quality-management evidence and a defined inspection standard before volume orders, and expect a named Japanese-speaking contact for technical and commercial follow-up.
SurfacePolish supplies from Xiamen, China. The buyer's own destination rules, conformity marking, tariff classification and documentation responsibilities stay with the buyer; confirm them against the authorities named above before ordering.
A first-article part, finished under the intended production settings, is the reference every later batch is compared against. Keep it identified and protected with the measurement record and the settings that produced it. Production acceptance then rests on a sampling plan: the sample size, the frequency, which features are measured and which are only inspected visually. For a low-volume build, sampling by part may be workable; for a batch of small parts, sampling by position in the charge is more useful, because parts at different points in a bowl see different media conditions. Record where each sampled part sat. Agree the disposition rule in advance, including whether rework is allowed and how a reworked part is identified, so a failed sample leads to a defined action rather than an improvised one.
Change one variable at a time. If the question is media shape, hold the machine, load, compound, cycle time and part mix constant and change only the medium. If the question is cycle time, hold the charge and settings constant and stop at two or three defined intervals. Use adjacent coupons or parts from the same production lot so the only difference is the variable under test. Label the pieces before they run and have the returned parts judged in one session under the same light, rather than one at a time as they arrive. Where several people judge appearance, ask each to rank the parts before discussion so the strongest opinion does not set the answer. Running two changes at once produces a result that cannot be attributed to either.
A trial shows what a given machine, charge and setting did to the parts tested, which is useful evidence but not a sizing study. Machine size depends on the largest envelope and mass in the family, the smallest part that must meet the same appearance, the load ratio you intend to run, and how many stages the part needs. Those are planning questions that belong in a line-concept discussion alongside the trial result. A part tested on a small machine may behave differently in a larger chamber, and a part run in a full production load may come out differently from one run in a light trial batch. Record both the settings and the load.
A bore cannot be protected by the cycle alone; it is protected by what is decided before the cycle. Masking or plugging the bore, keeping the part out of contact with heavy neighbours, choosing a lighter route and shortening the cycle all reduce the load the bore sees, but none of them guarantees a dimension. That is why the bore must be measured before and after at the same points, with a bore gauge or CMM, and compared with the drawing limit. SurfacePolish does not promise a tolerance or a result; the trial reports what was observed on the parts tested, and the dimensional acceptance decision stays with your own metrology and quality functions.
No. SurfacePolish supplies finishing machines, media and compounds across borders and runs a free sample trial on parts shipped to the factory in Xiamen. We do not design, integrate, program or commission robotic cells or automated handling lines, and no robotic polishing cell is offered here. What can be discussed is the part itself, the features that must be protected and the finishing step, and which loose-part machine and media route is worth testing. How parts are presented, loaded, unloaded and transferred is engineering scope you define and verify, and any machine or medium suggestion remains a starting point for your evaluation in Tokyo.
Use Tokyo, Japan as the destination on the enquiry and state whether the deliverable is equipment, media and compound, a representative sample review or a line concept. A destination does not imply local stock, a local service point or a local delivery time.
Tokyo buyers work to JIS, maintained by the Japanese Industrial Standards Committee, with the mechanical engineering and ferrous materials divisions covering machined metal parts; the JIS Mark scheme provides third-party product certification, and foreign exporters are eligible to apply. Drawings and inspection sheets issued by the customer, not a generic finishing standard, define the acceptance criteria for burrs, edge radius and surface texture.
Sources were retrieved on 2026-09-29 and describe the local industrial and trade context only. They do not evidence any SurfacePolish project, shipment, installation or service in Tokyo.
The buyer wants the pocket edges and the plate faces deburred without warping the plate or rounding the dowel holes that locate the tooling.
Send the material, dimensions, approximate weight, batch quantity, the incoming condition and photographs of the difficult features. Mark which features must not be contacted by media and state how the result will be inspected. This form carries source reference PSEO-0810; quote it if you prefer an additional manual reference.
Open the SurfacePolish enquiry form Email a prepared enquiry
No price, lead time, certification or result is promised here. Confirm whether a sample trial is available for the specific part and what the trial can and cannot show.
Page PSEO-0810 · revised 2026-09-29 · cross-border equipment, media and scoped sample review. City context is sourced and cited above.
Use this local checker to identify missing part and inspection information. It prepares a technical-review brief; it does not approve a machine, process recipe or production result.
Complete the part details to prepare a review brief.
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