Delrin CNC Precision Machining

±0.003 mm on CNC milling, ±0.002 mm on CNC turning; ±0.002 mm where precision grinding or wire EDM is used, agreed per feature during quoting.

Choosing a grade within stainless steel

Austenitic, martensitic, and precipitation-hardening stainless grades are the grades that come up in practice. 303 for free-machining work, 304 and 316L for corrosion resistance, 17-4 PH where strength is needed after ageing, 416 and 420 where hardness is required.

Your grade selection is usually settled by the service environment — corrosion, strength, or temperature, and only then by machinability. If you choose on machinability first, your part meets the drawing and fails in service.

What happens to tolerance on stainless steel?

Dimensional stability is good once the part has stopped moving, but thin walls distort from the residual stress released by removing stock. Stress-relieving between roughing and finishing is the standard response on a tight-tolerance thin-wall part.

The general rule for your part is that a tolerance is held by the process, not by the machine. Where a feature is tight, the finishing pass is separated from roughing, the part is allowed to stabilise, and the measurement is taken at a controlled temperature.

What finishing and surface treatment apply to stainless steel?

Passivation after machining restores the chromium oxide layer that free iron from cutting tools has contaminated.

You specify finishing on the drawing, not assume it at the end. Where a coating adds thickness, threaded and press-fit features need the allowance stated, because a coating applied after inspection changes the fit.

Tool consumption and cycle time on stainless steel

Heat does not leave with the chip, so it stays in the cutting zone; the surface layer work-hardens, and the next pass cuts through hardened material, which accelerates tool wear.

The lever that matters most for you is usually design rather than process: pocket depth, corner radius, and wall thickness change cycle time more than any tooling choice, because they determine the tool that can be used and therefore how much material can be removed per minute.

Who is on the other side of the purchase order?

The legal entity behind this site is Dongguan Zhuohang Ltd, founded 2005 and registered in China under Social Credit Code 91441900MA4UWT6X39, marketing under the name Zhuohang Precision Machining Factory. Its registered and production address is No. 8, Shuibian Songyuan Road, Hengli Town, Dongguan, Guangdong, China 523470.

Use the National Enterprise Credit Information Publicity System and the 18-character code to verify a Chinese manufacturer. Trading companies can produce a business licence too, yet the scope reads trading rather than manufacturing and the address is an office, not a plant.

Depth in the relevant machine family

Total machine count is not the question, the question is how many machines sit in the family that makes your part, because that is the queue your part waits in. The floor runs over a hundred machines: 50+ three-axis centres for prismatic work, 20+ four-axis, 20+ five-axis, 25+ turning and mill-turn centres, Swiss-type lathes for long slender parts, precision grinding and wire EDM for the tightest features.

The spare capacity in that family is what lets a part send work to a free machine instead of letting it wait when a machine is pulled for service. That, not the headline machine, is what protects a delivery date.

Delrin CNC precision — the engineering polymer discipline

Delrin (acetal, POM) is the engineering polymer with the highest strength, stiffness, and dimensional stability in common machining use. Properties: tensile 70 MPa, flexural 2,600 MPa, friction 0.21, service -40 to 105 °C. Application: gears, bearings, bushings, valve bodies, pump impellers, electrical insulators, food-grade. The tolerance: Delrin holds ±0.05 mm on milled, ±0.03 mm on turned, ±0.1 mm on long (thermal expansion 80-110 µm/m/°C — 5× aluminum). The tolerance band on Delrin is 10-30× wider than on aluminum. The cost: Delrin $4-8/kg (comparable to aluminum); per-part cost 0.8-1.2× aluminum (faster cycle). Material: Delrin 150 (general-purpose), 500 (high-performance), 570 (20 percent glass-filled). Food-grade Delrin FDA-compliant per 21 CFR 177.2480.

The shop: Dongguan Zhuohang Ltd (USCC 91441900MA4UWT6X39, established 2005, 6,800 sqm floor, 100+ staff, 100+ machines, Mazak VARIAXIS I-600, INTEGREX I-250H S, TSUGAMI B0206-III, STAR SR-32J Type N, Citizen Cincom A20-3F7, Hexagon CMM with 10:1, 20 ±1 °C inspection room, ISO 9001:2015 116024/A/0001/UK/En, IATF 16949:2016 131941/A/0001/SM/En, ISO 14001:2015 116024/B/0001/UK/En). Tolerance: ±0.003 mm milling, ±0.002 mm turning, Ppk ≥1.67, Cpk ≥1.33. Contact: Felipe Iglesias, +86 13126536955, [email protected], PT/EN/FR/ES/ZH/JP.

Delrin vs aluminum for low-load structural parts — the cost-mass-stiffness matrix

The choice between Delrin (acetal, 70 MPa tensile, 2.6 GPa flexural, 1.42 g/cm³) and aluminum 6061-T6 (310 MPa tensile, 69 GPa flexural, 2.70 g/cm³) for low-load structural parts runs on three axes: cost (Delrin $4-8/kg, aluminum $4-8/kg — parity), mass (Delrin 1.42 vs aluminum 2.70 — Delrin is 53 percent lighter), stiffness (aluminum is 26× stiffer on flexural modulus). A low-load part that needs mass savings (a drone frame, a wearable, a packaging component) wins on Delrin; one that needs stiffness (a fixture, a structural bracket, a precision housing) wins on aluminum. The tolerance decision: Delrin holds ±0.05 mm on milled features, ±0.03 mm on turned, ±0.1 mm on long dimensions (thermal expansion 80 µm/m/°C — 5× aluminum's). Aluminum holds ±0.003 mm on milled, ±0.002 mm on turned, ±0.05 mm on general.

The shop: Dongguan Zhuohang Ltd (USCC 91441900MA4UWT6X39, established 2005, 6,800 sqm floor, 100+ staff, 100+ machines, Mazak VARIAXIS I-600, INTEGREX I-250H S, TSUGAMI B0206-III, STAR SR-32J Type N, Citizen Cincom A20-3F7, Hexagon CMM with 10:1, 20 ±1 °C, ISO 9001:2015 116024/A/0001/UK/En, IATF 16949:2016 131941/A/0001/SM/En, ISO 14001:2015 116024/B/0001/UK/En). Tolerance: ±0.003 mm milling, ±0.002 mm turning, Ppk ≥1.67, Cpk ≥1.33. Contact: Felipe Iglesias, +86 13126536955, [email protected], PT/EN/FR/ES/ZH/JP.

Delrin moisture and temperature — the dimensional stability limits

Delrin's dimensional stability limits: moisture absorption 0.22 percent (low for a polymer, but enough to grow 0.05-0.10 mm on a 50 mm dimension over 24 hours in 50 percent RH); thermal expansion 80 µm/m/°C (5× aluminum); service temperature -40 to 105 °C (above 105 °C the polymer softens and the tolerance drifts). A buyer who specifies Delrin for a part above 100 °C should pick PEEK (250 °C) instead; one for a precision part at ±0.003 mm should pick aluminum (the polymer cannot hold that tolerance). The post-machining stress relief: Delrin builds internal stress during machining, the part warps after the cut. The stress relief: 30-60 minutes at 145-155 °C (then air cool), before the finish cut.

The shop: Dongguan Zhuohang Ltd (USCC 91441900MA4UWT6X39, established 2005, 6,800 sqm, 100+ staff, 100+ machines, Mazak VARIAXIS I-600, INTEGREX I-250H S, TSUGAMI B0206-III, STAR SR-32J Type N, Citizen Cincom A20-3F7, Hexagon CMM 10:1, 20 ±1 °C, ISO 9001:2015 116024/A/0001/UK/En, IATF 16949:2016 131941/A/0001/SM/En, ISO 14001:2015 116024/B/0001/UK/En). Tolerance ±0.003 mm milling, ±0.002 mm turning, Ppk ≥1.67, Cpk ≥1.33. Felipe Iglesias +86 13126536955 [email protected] PT/EN/FR/ES/ZH/JP.

What this shop actually runs

If you ask for capability evidence, you deserve a specific answer. This facility operates 100+ CNC machines across 6,800 m2 in Dongguan, China, staffed by 100+ people. The machines, listed by category:

• 5-axis machining centres (10+) - Mazak VARIAXIS I-600 (510/910/510 mm travel, 12,000 rpm, 22 kW, 71.6 N·m, 30-tool BT40) and Mazak INTEGREX I-250H S (B-axis 0.0001°, 24 kW, 124 N·m, 38-tool HSK-A63). Intended for compound-angle parts, single-setup multi-face prismatic work, and aerospace fittings where datum transfer loss is unacceptable.
• 3-axis / 4-axis machining centres (50+) - Brother SPEEDIO S500Z2N / S700Z2N (10,000 rpm, 14/21-tool ATC, 0.7 s tool-to-tool, Z-axis 2.2 G) and Mazak VCE-430A L / VCE-570C L (10,000 rpm, 118 N·m, 24-tool ATC). Intended for prismatic parts, plates, brackets, housings.
• Swiss-type turning centres (10+) - Citizen Cincom A20-3F7 (Φ20 mm, 10,000 rpm), TSUGAMI B0206-III / B0205-III (Φ20 mm, 0.1 µm), STAR SR-32JII / SR-32J Type N (Φ32 mm, 8,000 rpm). Intended for long, slender rotational parts at ±0.002 mm.
• CNC turning centres (20+) - HEADMAN T70M/1250 (720 mm swing, 117 mm bore, 3,000 rpm, BMT75 12-station turret). Intended for shafts, bushings, flanges up to ±0.002 mm.
• Wire EDM (5+) - Sodick AQ535L (550/350/300 mm travel, ±20° taper, 800 kg workpiece). Intended for hardened tool steel, internal splines, sharp internal corners that milling cannot reach.
• Inspection: Hexagon CMM + 20+ gauges - Hexagon CMM for coordinate measurement, plus vision system, profilometer, hardness tester, coating thickness gauge, XRF for material verification. The 10:1 rule (gauge 10x more accurate than the band) is applied to every feature.
• Machine highlights - VARIAXIS I-600: one-setup multi-face 5-axis + MAZA-CHECK auto-calibration; INTEGREX I-250H S: DONE-IN-ONE mill-turn, B-axis 0.0001° + Ai thermal shield; SPEEDIO S500Z2N / S700Z2N: Z-axis 2.2 G + 0.7 s ATC; Swiss-type: guide-bush switchable + 0.1 µm resolution.

Tolerance bands: ±0.003 mm milled, ±0.002 mm turned, ±0.002 mm ground or wire-cut. Capability indices: Ppk >= 1.67 at the initial study; Cpk >= 1.33 ongoing in production.

Certifications: ISO 9001:2015 (116024/A/0001/UK/En) · IATF 16949:2016 (131941/A/0001/SM/En, design clause 8.3 excluded) · ISO 14001:2015 (116024/B/0001/UK/En), held by Dongguan Zhuohang Ltd (USCC 91441900MA4UWT6X39, since 2005).

Service area: we supply Austria, Belgium, the Czech Republic, Denmark, France, Germany, Greece, Hungary, Ireland, Italy, the Netherlands, Spain, Sweden and the United Kingdom in Europe; Brazil, Canada, Mexico and the United States in the Americas; China, Israel, Japan, Singapore and Sri Lanka in Asia; Australia and New Zealand in Oceania; and South Africa in Africa, with worldwide delivery from China.

Contact: Felipe Iglesias, [email protected], +86 13126536955.

Delrin CNC Precision Machining — Related Pages

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• 3 axis cnc precision machining