Delrin CNC Machining Services

Precision Machining for Strong, Low-Friction & Dimensionally Stable Delrin Parts
Custom Prototypes and Production with Advanced CNC Capabilities

What is Delrin (POM) CNC Machining?

Delrin® (acetal homopolymer, POM-H) and acetal copolymer (POM-C) are stiff, low-friction engineering plastics used for gears, bushings, wear guides, fixtures, and precision mechanisms. They machine quickly and hold tight tolerances with clean edges.

Tooling: Sharp O-flute / polished carbide; high rake to shear cleanly.
Heat control: Prefer air blast or mist; avoid chip-weld/melting.
Feeds/Speeds: Higher feed with modest step-over; constant chip load.
Workholding: Soft jaws/vacuum; support thin walls to prevent chatter.

Delrin (POM) CNC machining with O-flute tool and air blast

Delrin machinability, low friction, and dimensional stability

Key Considerations

POM-H (Delrin) has slightly higher strength/stiffness; POM-C offers better hot-water/chemical resistance and lower center-line porosity on thick sections. Both cut best with sharp tools and steady chip flow.

For precision parts: rough → optional stress relief/anneal → finish passes. Deburr lightly to keep edges crisp; plan a skim pass on show faces for uniform texture.

Precision Delrin CNC Machining

3, 4, 5-Axis CNC Milling

Fast milling for wear plates, cams, pockets, and thin walls. Balanced holders and sharp tools produce uniform textures ready for assembly—no post-polish typically required.

CNC Turning & Mill-Turn

Low-friction OD/ID finishes for bushings, rollers, and pulleys. Sharp inserts and positive chip-breaker geometry keep diameters consistent and reduce fuzz.

Delrin CNC Machining Capabilities

Standards	Detail
Max Part Size (X/Y/Z)	2300 × 1500 × 600mm
Minimum Feature Size	⊘1mm
Wall Thickness	0.25mm
Tolerance	+/-0.01
Surface Finish (as milled)	Ra0.5–Ra3.2
Standard Lead Time	3 working-days for rapid prototyping
Pricing Level	To be confirmed after design review
Type of Machine	Gantry CNC / 3-4-5-Axis CNC / Mill-Turn Compound CNC / Swiss-Type CNC / Turning Machine...etc...
Common Grades	Delrin® (POM-H), Acetal Copolymer (POM-C), Glass-Filled Acetal, ESD/Antistatic Acetal

Delrin & Acetal Grades

Pick the right balance of strength, stability, chemical resistance, and ESD performance.

Delrin® (POM-H) Acetal Copolymer (POM-C) Glass-Filled Acetal ESD/Antistatic Acetal

Delrin® (POM-H)

Higher strength & stiffness
Excellent fatigue and wear
Great for gears, cams, bushings
Good dimensional stability

Use sharp tools and air blast to avoid chip-weld; plan a light finish pass on show faces.

Acetal copolymer fluid manifold machined with clean ports (3:2)

Acetal Copolymer (POM-C)

Better hot-water & chemical resistance
Low porosity on thick sections
Good creep resistance
Food/medical friendly options

Similar parameters to POM-H; confirm media compatibility for service environment.

Glass-Filled Acetal

Higher stiffness & heat deflection
Abrasive—use coated carbide
Structural brackets, housings
Dimensional stability under load

Reduce SFM, maintain coolant/air to control heat; expect more tool wear than unfilled grades.

ESD acetal machining tray for electronics handling (3:2)

ESD / Antistatic Acetal

Static-safe handling and tooling
Fillers affect chip behavior
Trays, nests, fixtures
Surface resistivity to spec

Verify resistivity targets; tune feeds to keep edges sharp and reduce fuzz.

Display of Our Delrin CNC Machining Parts

Delrin CNC machined bushing with reamed bore for smooth rotation

Delrin CNC machined fixture plate with tapped holes and countersinks

Delrin CNC machined guide block with precision slots and chamfers

Delrin CNC machined timing pulley with clean grooves

Material Machining Guide

Delrin CNC Machining: Selection, Process, and Quality Notes

Delrin is commonly considered for gears, bushings, rollers, spacers, and low-friction precision plastic parts. It is selected because of dimensional stability, low friction, and strong machinability. For CNC machining, the final result depends on material grade, toolpath strategy, tolerance allocation, surface finish, and inspection planning.

Good Fit

Use Delrin when the application benefits from dimensional stability, low friction, and strong machinability and the design can be machined with stable workholding.

Watch Points

Confirm wall thickness, hole depth, thread callouts, burr control, cosmetic surfaces, and finish buildup before production.

Quality Planning

Define critical dimensions, inspection method, tolerance class, and documentation requirements before the first article.

Topic	Practical Guidance for Delrin
Design review	Send 3D CAD, 2D drawings, material grade, finish notes, quantity, and critical-to-function dimensions.
Machining process	MTSPi can review whether milling, turning, drilling, tapping, boring, or a combined route is best for the geometry.
Surface finish	Plan cosmetic and functional finishing early, especially where coating thickness, polishing, or deburring affects fit.
Inspection	Use calipers, micrometers, gauges, CMM, or visual inspection based on tolerance risk and assembly function.

Related Material Choices

Compare Delrin With Nearby CNC Materials

ABSlow cost, impact resistance, and easy machining Acrylicoptical clarity and polished appearance Nylonwear resistance, toughness, and fatigue performance PPchemical resistance and low density HDPEtoughness, low friction, and chemical resistance PEimpact resistance and low moisture absorption PCimpact strength and transparency PEIheat resistance and dimensional stability ULTEMtemperature resistance and strength PEEKhigh temperature, chemical, and wear resistance POMexcellent machinability and dimensional stability TECAFORMAHstable acetal performance and clean machining

FAQ

Is Delrin suitable for CNC machining?

Yes, Delrin can be CNC machined when the grade, geometry, tooling, workholding, and tolerance requirements are planned correctly.

What should I send for a Delrin machining quote?

Send CAD files, 2D drawings, quantity, material grade, finish requirements, tolerance notes, and any inspection or packaging needs.

Can Delrin parts be finished after machining?

Often yes. The right finish depends on the material family and part function. Confirm finish thickness and cosmetic expectations before machining.

How do I reduce cost on Delrin CNC parts?

Use practical tolerances, avoid unnecessary deep pockets or tiny holes, simplify setups, and reserve tight control for functional features.

CNC Plastic MaterialsReturn to the material category page. CNC Materials LibraryCompare all metals and plastics. Surface TreatmentChoose finishing options for machined parts. Request a QuoteSend files for manufacturability review.

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Delrin CNC Machining Services