An industrial machinery buyer in Kobe, Japan needs a copper electrode plate finished bright and clean, with no embedded media or compound residue left on the contact face. SurfacePolish supplies finishing machines, media and compounds internationally and offers a free sample trial, returning the tested plates with observations and a proposed media, compound and cycle direction rather than a guarantee. This brief is written for a buyer in Kobe working on industrial machinery; it describes equipment, media and a scoped sample review, not a local polishing service.
How much stock may the sequence remove before datums, seal faces, flatness or edge form fall outside their allowance?
Can available media actually reach the geometry, and what finish is realistic in the recesses and internal features it cannot reach?
Which faces must reach a mirror and which only need to be clean and uniform, and how is each one judged?
Two parts with the same alloy name can behave differently under the same media. Hardened tool steel resists cutting and holds a polish longer, while annealed low-carbon steel cuts quickly and can smear under high contact pressure. Austenitic stainless work hardens, so a heavy first pass can leave a skin harder than the bulk, after which fine media stop removing material and only burnish it. Aluminium and brass are soft enough that media pressure rolls metal instead of cutting it, producing a wave rather than a cut. Ask for the actual condition - hardness range, heat treatment, cold work, and whether the part was cast, forged or machined from bar - then confirm it on a sample rather than trusting a datasheet to describe the surface the media will meet.
Magnetic finishing drives small pins or needles with a moving magnetic field, so the abrasive follows internal edges, cross holes, slots and fine detail that no tumbling medium of usable size can enter. It is the practical route for small precise parts such as valve spools, small gears, nozzle bodies and instrument components where a bright edge or a cleaned intersection matters. It removes very little material, so it is a refinement and edge-conditioning step rather than a way to erase coarse grinding marks. Working envelope and part mass are the main limits: large faces and heavy parts do not fit, and the effect falls off where the field cannot drive the pins. Check coverage on a sample with magnification and a borescope.
| Machine route | Where it fits | What it will not do |
|---|---|---|
| Vibratory finishing machine (bowl or tub) | Cut-to-colour sequences on rigid, mostly open parts such as housings, covers, brackets and frames, with adjustable energy and no fixturing. | Cannot present media uniformly into pockets with narrow mouths or deep internal bores, and broad flat faces finish more slowly than edges. |
| Centrifugal barrel finishing machine | High-speed cut down and refinement on small to medium parts where a short, energetic cycle is needed before colour stages. | Aggressive on edges and thin sections, requires tight cycle control, and does not replace a finer refinement stage. |
| Barrel finishing machine / rotary barrel tumbler | Dense, uniform colour on small hardware that tolerates sliding contact, especially with steel media for a burnished appearance. | Nothing longer than the barrel diagonal can be processed, and slender parts can bend or nick against neighbours in the load. |
| Dry polishing machine and dryer | Final lustre, dry colour and post-wet drying where the last reflected image cannot be produced by a wet mass-finishing stage. | Works on accessible faces only, generates dust and heat that need control, and offers no way to correct a defect left by an earlier stage. |
Compound concentration is a process variable that drifts. Dosing on a timer is convenient but ignores carry-out, evaporation and the fines load, so a batch that starts at target can finish well above or below it. Meter dose against water flow, check pH and, where available, conductivity at the start and end of a cycle, and record those values with the batch. Water quality shapes the final image: hard water leaves mineral spots that read as haze, and high chloride or iron content can stain stainless during rinsing. The rinse after each stage deserves the same control as the finishing stage, with enough volume and flow to remove compound and loose fines before the part dries, because dried residue is far harder to remove without disturbing the finish.
| Media | Best fit | Watch out for |
|---|---|---|
| Medium ceramic triangles or angle-cut shapes | Blending, edge conditioning and the refinement step that removes the coarse cut pattern on housings, brackets, covers and frames. | Media that cannot enter a slot or recess leaves those areas at a different finish, so those faces need a separate operation or a stated lower standard. |
| Coarse ceramic angle-cut cylinders or triangles | First cut stage on rigid parts with open faces, removing grinding or machining damage on cast iron, steel and stainless before refinement. | Leaves a deep pattern the next stage must fully erase, chips thin edges, and its wear debris carries fine abrasive into later stages if the charge is not screened. |
| Hardened steel media, balls and shaped shot | Bright burnishing of stainless and hardened steel, and the final wet lustre stage where a dense medium can peen a surface smooth. | Can transfer iron and rust to stainless, dents soft or thin parts, and must be kept in a dedicated charge away from ceramic media. |
| Dry media - walnut shell | Dry polishing, light deburring and lubricity on parts where a residual oil film is acceptable, and drying or lustre steps after wet processing. | Not a stock-removal medium, generates dust that needs extraction, and can leave an oily film that interferes with a later cleaning or coating requirement. |
Two of the most expensive defects are invisible in a reflected image. Media lodges in blind holes, slots, undercuts and threaded features, and it can survive rinsing, drying and even assembly, while the small pins used in magnetic finishing can embed in soft surfaces. At the same time, long cycles quietly round edges past their limit and remove material from datums, seals and bearing seats, so a part passes a visual check and fails a fit check. Control both with geometry rather than appearance: reconcile a counted charge, borescope or pin gauge every cavity, measure edge radii and critical dimensions against incoming values, and set a maximum cycle time that the edge and dimensional allowances actually support.
| Failure mode | Likely cause | How to catch it |
|---|---|---|
| Sleeks, fine unidirectional lines across a bright face | Contaminated charge or rinse, a metal particle trapped between media and part, or a polishing direction that was never rotated between successive stages. | Orient the light along and then across the lines, note where each family appears on the part, and inspect the charge and rinse screens for embedded foreign particles. |
| Haze, a general loss of image clarity with no directional pattern | Worn media shedding an oversized fine fraction, agglomerated abrasive in the compound line, or fine grit carried into a late stage from screens, machine walls or a shared rinse. | View under raking light at low magnification against a master, then trace the pattern by machine and by rinse line to separate a charge problem from a rinse or transfer problem. |
| Compound residue film, water spots or a dull bloom after drying | Incomplete rinsing, hard or contaminated rinse water, a dose above target, or drying that leaves a cavity to bleed residue onto the finished face. | Wipe a defined area with a clean white cloth after drying, inspect cavities for bleed-out, and check rinse water hardness or conductivity at the point of use. |
| Media lodged in blind holes, slots, undercuts or threaded features | Media size too close to the opening, a slot or cavity that traps the charge, or no defined retrieval step before rinsing and drying. | Reconcile a counted media charge before and after the cycle, borescope each cavity at an agreed angle, and pin or thread gauge the features the charge could enter. |
Kobe's manufacturing is concentrated in food, transport equipment and general machinery. The city's 2020 Census of Manufacture report counts 1,394 establishments with four or more employees, 67,951 workers and 3,421.1 billion yen of manufactured goods shipments, with value added up 3.3 per cent. It states that food manufacturing and metal products together account for about a quarter of all establishments, and that food, transport equipment and general machinery together account for just over half of employment, with Hyogo ward especially strong in transport equipment and Nishi ward in production machinery and metal products. The city also publishes an economic census and industrial statistics series, and the port has been the city's trade gateway since it opened to foreign trade in 1868.
For this brief the relevant part of that base is machinery: Kobe's 2020 Census of Manufacture report lists general machinery among the three industries making up just over half of manufacturing employment, and records Nishi ward as having high shares of production machinery and metal products.
Kobe's three largest manufacturing employers by industry are food, transport equipment and general machinery, so the surface requirement splits between hygienic, cleanable finishes for food equipment and dimensional, burr-controlled finishes for transport and general machinery parts. General machinery and metal products are concentrated in Nishi ward, where small firms supplying machined components need a finish specification that travels with the drawing rather than a verbal agreement.
A Kobe buyer should separate the two cases before choosing a process: transport and general machinery parts where edge and burr limits govern, and food-equipment parts where cleanability and surface condition govern, because the same media and compound choice will not serve both.
Freight context: Port of Kobe (神戸港), open to foreign trade since 1868, Kobe Airport (神戸空港), opened in 2006. Kobe City records that after the 1995 Hanshin-Awaji earthquake the port's facilities were restored within two years, and that the 2006 opening of Kobe Airport established a combined sea, air and land transport system. Customs clearance in the Kobe area is handled by Kobe Regional Customs, one of Japan Customs' regional offices.
The customs authority is Japan Customs, the Customs and Tariff Bureau of the Ministry of Finance, with regional customs at Tokyo, Yokohama, Nagoya, Osaka and Kobe. Any person importing goods must declare them to the Director-General of Customs and obtain an import permit after examination and payment of customs duty and consumption tax. The declaration is normally filed by the importer or by a customs broker acting as proxy, on a triplicate import (customs duty payment) declaration form (Customs form C-5020) supported by the invoice, the bill of lading or air waybill, a certificate of origin where a WTO rate applies, certificates of origin for preferential rates, packing lists and freight and insurance documents where required, plus any licence or certificate demanded by laws other than the Customs Law. More than 90 per cent of import procedures are computerised. A JIS Mark certificate is a separate, voluntary third-party scheme; foreign exporters are eligible to apply, and certification bodies must comply with ISO/IEC 17065.
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.
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.
Ra and gloss are not interchangeable and should not be traded for one another. Ra is a two-dimensional profile average over a defined cutoff, so a face can hold a low Ra while still showing waviness, orange peel or directional marks that dominate the reflected image; conversely, a surface with a slightly higher Ra can look brighter because its texture scatters light uniformly. If the requirement is appearance, specify appearance: a reflectance or gloss reading at a stated angle and instrument geometry, plus a physical master and viewing conditions. If the requirement is texture or function, specify the profile parameter, the cutoff and the evaluation length. Ask for both where both matter, and record which one governs acceptance at each location.
A trial runs a small, hand-selected load on equipment that has just been set up. Production runs mixed batches on a media charge of unknown age, with transfer time between stages, variable rinse quality, operators on different shifts, and parts arriving with different incoming damage. Plan a defined pilot batch that uses the intended line configuration and a full first-article inspection, then compare it with the trial observations before committing volume. Watch the variables that scale badly: drying time in a humid season, water chemistry, load density and the handling between cut, colour and lustre stages. Treat the pilot as the real test of stability and keep its settings record with the parts so any drift can be traced.
Orange peel is a wave in the surface, produced when metal is deformed rather than cut, usually on softer alloys, on work-hardened layers, or when a heavy cut stage is followed by too little refinement. It shows as a distorted reflected line when you view a straight edge in the face. Polishing with finer media does not remove it, because the wave extends below the depth a fine stage can reach; the sequence has to return to a cutting stage and then refine properly. If the wave comes from the incoming material or a forming operation, it may not be removable at all.
Send representative production parts including the thinnest wall, the tightest feature that must stay clear and the worst edge, plus a witness coupon of the same material and condition, a drawing extract covering the finished faces and the acceptance requirement you intend to apply. Label every piece and note its incoming condition with photographs, readings and measurements. The return is the tested parts with observations and a proposed media, compound and cycle direction for the buyer's own evaluation. A trial on parts shipped from Japan is a comparison, not a qualification, and it establishes no capacity or delivered surface value.
No to both. SurfacePolish is a cross-border supplier of finishing machines, media and compounds, and it does not supply or perform electropolishing or operate a plant, branch, dealer or technician service in Japan or any other market. What is offered is equipment and consumables, a scoped discussion of a finishing line concept, and a free sample trial in which representative parts are shipped to Xiamen and returned with observations and a proposed process direction. Where an electrochemical finish is under consideration, the discussion stays a comparison with a mechanical route.
Use Kobe, 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.
Kobe buyers reference JIS, maintained by the Japanese Industrial Standards Committee, whose mechanical engineering and ferrous materials divisions cover the city's machinery and transport-equipment output, with the JIS Mark scheme available for third-party product certification. For food-equipment work the additional reference is the customer's hygiene and cleanability requirement, which is specified on the drawing rather than by a general finishing standard.
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 Kobe.
The buyer wants a clean bright face with no embedded abrasive or residue, because contamination would affect the electrical contact.
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-0859; 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-0859 · revised 2026-09-29 · cross-border equipment, media and scoped sample review. City context is sourced and cited above.
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