About Jintaijin: the workshop, the people and the way a job is handled

A manufacturer of finishing equipment in Xiamen since 1992, working out of a plant it owns, building every machine it sells and standing behind it afterwards.

The 金泰金研磨 sign over the gate of the plant at No. 31 Xinchang Road, Xiamen, with machinery bays behind it and crated machines on the apron — The plant gate at No. 31 Xinchang Road, Haicang District, Xiamen: the 金泰金研磨 sign over the bays, with machines crated and waiting on the apron.

1992founded in Xiamen 1workshop, owned outright 6product lines 24granted rights: 1 invention, 17 utility models, 6 designs

Who we are

Xiamen Jin Tai Jin Grinding Technology Co.,Ltd. has been building finishing equipment in Xiamen since 1992. We are a workshop rather than an office: the drawings are drawn here, the frames welded here, the panels wired here, the machines run here before they are loaded, and the people who answer the telephone afterwards are the people who built them.

One building, four bays

The plant is arranged along a single aisle. The first bay is where the frames are welded and the guarding is fitted; the second is where the tanks, the drives and the electrical cabinets go in; the third is the assembly bay, where a machine grows from a frame into something that runs; and the fourth is the test bay, with a bench, a set of instruments and the parts a customer has sent us to try. Past the fourth bay is the loading door.

The assembly floor at the Xiamen works: yellow racking running down the shop, with machines in build order along the aisle and the bay doors at the far end — The assembly floor: parts move down the racking in build order, and the same team runs the machine on the bench before it is crated.

What we build, and what we do not

We build six lines of equipment: vibratory, disc, barrel, magnetic and centrifugal machines, and the dryers that go with them. We also make the media and the compounds that run in the equipment, because the result comes out of the combination of the three and not out of the machine alone. The machines page lists every model with its capacity, and the company profile is the manufacturing file — the workshop, the capacity, the type-examination reports and the equipment in full.

What we do not do is pretend the numbers are better than they are. If a figure is not ours to publish, this page says so rather than filling the gap with an estimate.

How a job runs

Every job follows roughly the same path, because the decisions are taken in the order they can be checked.

The enquiry A photograph of the part, the material, the size and the result you want. A drawing, a sample or a tolerance figure are better than a description, and we will say so if what we have is not enough.

The trial Your parts, on our bench, against a figure or a reference part. It costs a day of our time and it is what turns the quotation from a guess into a number.

The quotation The machine, the media, the compounds and the cycle time, as a price that can be set beside any other on the same basis. If a cheaper combination would not hold the figure, we say so.

The drawings The layout of the machine for your part, drawn here, with the guarding, the loading and the access around it. Nothing is cut until the drawing is signed.

The build slot A standard machine is built and shipped in 25 to 35 days from the deposit. A built-to-order configuration takes longer, and one with a separator, a dryer or a special supply longer again. The slot is agreed first.

The test run A loaded run in the test bay, on your parts if you have sent them, with the settings written down. What leaves the building is what was proved on the bench.

The loading Crated, wrapped and lifted onto the vehicle at the loading door. The site is close to Xiamen port, which is why we can quote the freight instead of passing it on.

The work that comes through the door

The same six lines turn up in very different workshops, and the difference is usually the acceptance rather than the work: a bracket that has to come out of a tray without a particle on it, a blade that has to keep an edge, a frame that must not go white. The short version is on the finishing machine FAQ.

What the acceptance changes

The work itself is often the same. What changes is what the customer has to be able to show somebody afterwards, and that requirement decides the process — which is cheaper to design for than to correct.

Steel scissors and hand tools finished by Jintaijin, laid out on the bench for inspection — Hand tools and cutlery

Stainless instrument and implant brackets finished by Jintaijin, packed in a tray — Instrument and implant brackets

Acetate and plastic eyewear frames finished by Jintaijin, front and temple pieces — Eyewear frames

Machined and hydraulic fittings finished by Jintaijin, photographed on the shop bench — Machined and hydraulic parts

On aluminium there is a note on shine against a surface that measures and another on improving the surface quality. On medical work, finishing without scratches, residue or rounded edges. On frames, polishing without whitening and the dry and wet process guide. On titanium, electropolishing against mechanical polishing.

The people who answer afterwards

The machine is the part of the relationship that is easiest to deliver and the hardest to make useful on its own. Most of what a customer needs once the crate has gone is somebody who will take the call, and the calls are rarely about the machine. They are about the media, the compound, or a batch that came out differently from the last one.

A magnetic finishing drum opened up in the shop, showing the stainless barrel, the water in it and the magnetic pins that do the cutting — A magnetic drum opened in the shop: the pins work where a bowl cannot reach.

The media is ours, and so is the answer

We make the media and the compounds ourselves rather than reselling somebody else's: the grinding media, the ceramic media and the consumables are ours, so the advice that comes with them is advice we can act on. When a result is not right, the first question is whether the charge was right for the material, and that is a question we can answer without looking it up.

Ceramic and plastic tumbling media in two bowls beside finished stainless and aluminium parts from the shop — Tumbling media, beside the parts it finishes.

Stainless steel washers after a finishing run, piled bright and burr-free on the grey inspection bench — Stainless washers, checked on the bench.

What is in the crate

Each machine leaves with the settings proved on the bench, the manuals, the arrangement drawings, the spare parts list and the installation paperwork. We would rather a customer could put a machine into production without us than have them call every time the same question comes up.

Commissioning, wherever the machine is

A machine that runs in Xiamen can behave differently in another workshop, because the supply, the room and the operator are different. We commission in person and leave the settings written down for the next shift.

Inside the plant

The photographs below are of this workshop, grouped by what each one shows: the machine lines, then the machining, assembly and dispatch bays. A buyer reading a factory page is usually settling one question — whether this is a works that builds machines or an office that forwards them — and that reads off the floor.

The machine lines

Barrel finishing machines on their roller racks along the aisle of the workshop, with the roof trusses and the windows above them — Barrel machines along the aisle, with the media kept beside them.

Finished vibratory bowls and barrels wrapped in protective film, standing in the dispatch bay before crating — Finished bowls and barrels wrapped, waiting to be crated.

Machining, assembly and dispatch

The machining shop at the Xiamen works: lathes, a milling machine and part-machining benches under strip lighting — The machining shop: frames, shafts and brackets are cut here before assembly.

A finished barrel finishing machine with its control panel, standing on the workshop floor with the rest of the order wrapped behind it — A finished machine on the floor, with the rest of the order wrapped behind it.

A forklift loading crated finishing machines onto a truck at the loading door, under the Jintaijin works sign — Loading at the door: the machine is crated at the address it was built.

Crated and shrink-wrapped finishing machines stacked on a trailer outside the works, ready for the port — Crated and wrapped on the trailer outside the works, on the way to Xiamen port.

Certifications and patents, in three groups

Sixteen certificates are printed below in three groups: the machinery attestations, the quality management certificate, and the patent certificates. Each carries a number and a date, and the pages no longer in force are shown with that said plainly. The numbers are also collected on the Certifications and Patents page.

Machinery conformity — CE attestation M.2023.206.C88121 and M.2023.206.C88120

Both attestations were issued by UDEM International Certification Centre against Machinery Directive 2006/42/EC, with EN ISO 12100:2010 for mechanical safety and EN 60204-1:2006+A1:2009+AC:2010 for the electrical equipment. Reports DTT230706S005 and DTT230706S006 cover the vertical polishing machines, reports DTT230706S003 and DTT230706S004 the horizontal ones.

Each certificate number exists in two issues, and both are shown. The 2023 issue of each was assessed on 2023-06-05, registered on 2023-06-07 and is valid to 2028-06-06. The 2017 issue of each was assessed on 2017-06-05, registered on 2017-06-07 and expired on 2022-06-06. The expired pages are here on purpose: shown only the current certificate, a buyer cannot tell whether the earlier one was replaced or withdrawn.

UDEM attestation of conformity M.2023.206.C88121 for vertical polishing machines, assessed 2023-07-24, registered 2023-07-25, valid to 2028-07-24 — **M.2023.206.C88121 — vertical**2023 issuevalid to 2028-07-24

UDEM attestation of conformity M.2023.206.C88120 for horizontal polishing machines, assessed 2023-07-24, registered 2023-07-25, valid to 2028-07-24 — **M.2023.206.C88120 — horizontal**2023 issuevalid to 2028-07-24

UDEM attestation of conformity M.2016.201.N1362 for vertical polishing machines, the 2017 issue, assessed 2017-06-05 and expired 2022-06-06 — **M.2016.201.N1362 — vertical**2017 issueexpired 2022-06-06

UDEM attestation of conformity M.2016.201.N1363 for horizontal polishing machines, the 2017 issue, assessed 2017-06-05 and expired 2022-06-06 — **M.2016.201.N1363 — horizontal**2017 issueexpired 2022-06-06

Quality management — GB/T 19001-2016 / ISO 9001:2015, certificate 00726Q01571R001

The quality management system was certified by Zhongjian Certification Co., Ltd. to GB/T 19001-2016 / ISO 9001:2015, certificate number 00726Q01571R001, scope covering the design, development and production of grinders. The certificate prints a term of validity from 2026-06-03 to 2029-06-02 inclusive, and that printed term is what is quoted here rather than a claim about its status today. If you need the current position before you quote, ask us and we will tell you where it stands.

GB/T 19001-2016 / ISO 9001:2015 quality management certificate 00726Q01571R001 issued by Zhongjian Certification, term of validity 2026-06-03 to 2029-06-02 inclusive — **00726Q01571R001**GB/T 19001-2016 / ISO 9001:2015term of validity 2026-06-03 to 2029-06-02 inclusive

Patents — twenty-four granted rights, of which six are designs

The group holds twenty-four granted intellectual property rights and the breakdown matters: one invention, seventeen utility models and six designs. A design protects the appearance of a machine or a part rather than a technical solution, so the six are counted as rights of their own kind — twenty-four granted rights in total, not twenty-four patents.

Eleven of the certificate pages are printed below: the invention, six utility models and four designs. The full set, with the patent number, the filing and grant dates and the holder of record for each, is on the Certifications and Patents page.

Invention patent certificate 1969586 for a grinding machine, patent number ZL 2013 1 0112163.4, granted 2016-03-02 — **Invention — grinding machine**ZL 2013 1 0112163.4

Utility model certificate 3157533 for a grinding machine, patent number ZL 2013 2 0199567.4, granted 2013-09-11 — **Utility model — grinding machine**ZL 2013 2 0199567.4

Utility model certificate 11555383 for the oscillating mechanism of an octagonal barrel grinder, patent number ZL 2020 2 0125687.2, granted 2020-09-25 — **Utility model — oscillating mechanism**ZL 2020 2 0125687.2

Utility model certificate 11546734 for the drum drive of an octagonal barrel grinder, patent number ZL 2020 2 0125686.8, granted 2020-09-25 — **Utility model — drum drive**ZL 2020 2 0125686.8

Utility model certificate 10807466 for a work-holding fixture on a high-speed barrel grinder, patent number ZL 2019 2 1876730.2, granted 2020-06-23 — **Utility model — work-holding fixture**ZL 2019 2 1876730.2

Utility model certificate 4885876 for a barrel body with ventilation holes, patent number ZL 2015 2 0684940.7, granted 2015-12-23 — **Utility model — vented barrel body**ZL 2015 2 0684940.7

Utility model certificate 6487609 for a mixing unit for boron carbide lapping paste, patent number ZL 2017 2 0178285.7, granted 2017-09-22 — **Utility model — lapping-paste mixing unit**ZL 2017 2 0178285.7

Design patent certificate 3622449 for a polishing machine barrel body, patent number ZL 2015 3 0341497.9, granted 2016-02-24 — **Design — barrel body**ZL 2015 3 0341497.9

Design patent certificate 5895979 for a running support-wheel mechanism, patent number ZL 2020 3 0038942.5, granted 2020-06-23 — **Design — support-wheel mechanism**ZL 2020 3 0038942.5

Design patent certificate 5894174 for the BJ160 polishing machine, patent number ZL 2020 3 0037824.2, granted 2020-06-23 — **Design — BJ160 machine**ZL 2020 3 0037824.2

Design patent certificate 5949399 for the BJ600 polishing machine, patent number ZL 2020 3 0037818.7, granted 2020-07-17 — **Design — BJ600 machine**ZL 2020 3 0037818.7

The figures we can give you today

Five numbers a buyer usually asks for are not ours to publish yet: the floor area, the number of people on the team, the monthly output, the share of output going outside China, and the machine platforms we own rather than build to order. They are being confirmed by the business and will be added as figures rather than estimates.

Everything else we publish is on this page, on the company profile page, or in the finishing machine FAQ, and it can be checked against the documents behind it.

Talk to us about your part

Send a photograph of the workpiece, the material and the finish you need. We will come back with the machine, the media and the cycle time we would use for it, and we will tell you when the answer is that a different process is the right one.

What we need from you: a photograph of the part, the material, the size and the result you want — a drawing, a photograph of the current finish, or a sample. If there is a tolerance or a roughness figure, that is the most useful thing you can send, because it is what turns the answer from a suggestion into a quotation.

Send us your part

Send a photograph of the workpiece, the material and the finish you need. We will come back with the machine, the media and the cycle time we would use for it.

Send your part →