POM CNC Machining Services

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

What is POM CNC Machining?

POM (acetal, e.g., Delrin®) is a stiff, low-friction engineering plastic with excellent wear, dimensional stability, and moisture resistance. With sharp tools and stable fixturing, it machines very cleanly for precision bushings, gears, manifolds, and fixtures.

Tooling: Sharp polished carbide / O-flute; positive rake to shear, not rub.
Chip control: Aim for continuous chips; avoid rubbing that causes heat and whitening.
Feeds/Speeds: Moderate–high SFM with steady chip load; add a light finish pass on show faces.
Workholding: Soft jaws or vacuum; support thin webs to prevent chatter.

POM (acetal/Delrin) CNC machining with polished tools and steady chip flow

Acetal parts with crisp edges and uniform surface after CNC machining

Key Considerations

POM-H (homopolymer) offers slightly higher strength and hardness; POM-C (copolymer) provides better hot-water and chemical resistance. Keep tools sharp, clear chips, and use a light deburr to maintain color and edge quality.

For tight flatness on large plates: rough → let the part relax → finish. Avoid excessive clamping that can imprint surfaces.

Precision POM CNC Machining

3/4/5-axis milling in acetal for pockets, plates, and housings

3, 4, 5-Axis CNC Milling

Clean pockets, slots, and contours with minimal burr. Balanced holders and sharp tools deliver uniform textures and tight tolerances on cosmetic faces.

CNC Turning & Mill-Turn

Smooth OD/ID finishes and roundness on bushings and pulleys. Positive-rake inserts reduce fuzz; add a final sizing pass on critical diameters.

POM 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	POM-H (Delrin® / Homopolymer), POM-C (Copolymer), Lubricated (PTFE / MoS₂), UV-Stable / Outdoor, ESD / Antistatic

Machinable POM Grades

Pick strength, wear, chemical/UV resistance, and antistatic properties to fit your spec.

POM-H (Delrin® / Homopolymer) POM-C (Copolymer) Lubricated (PTFE / MoS₂) UV-Stable / Outdoor ESD / Antistatic

POM-H (Delrin® / Homopolymer)

Higher strength/hardness, crisp edges
Very low friction & wear
Great dimensional stability
Gears, pulleys, cams

Use sharp O-flute/carbine, steady feed; add a light finish pass on cosmetic features.

POM-C (Copolymer)

Better hot-water & chemical resistance
Lower centerline porosity risk
Stable for large plates/manifolds
Flow components, fixtures

Similar parameters to POM-H; for big plates, rough → relax → finish for flatness.

PTFE/MoS2 lubricated acetal wear parts (3:2)

Lubricated (PTFE / MoS₂)

Lower friction, improved wear life
Great for dry-running sliders/guides
Chip behavior slightly different
Conveyors, automation, tooling

Maintain sharp edges; tune feeds to avoid smearing on low-friction surfaces.

UV-stable acetal parts for outdoor use (3:2)

UV-Stable / Outdoor

Improved color/strength retention outdoors
Enclosures, covers, hardware
Machines like standard POM
Check pigment/finish specs

Confirm film/coating removal and desired surface texture before finishing.

ESD-safe acetal fixtures and trays (3:2)

ESD / Antistatic

Static-safe covers, trays, nests
Fillers can change chip flow
Surface resistivity to spec
Semiconductor handling

Adjust feeds for sharp edges; verify resistivity targets and cleaning/handling processes.

Display of Our POM CNC Machining Parts

White POM (Acetal) CNC machined gear showing wear resistance and durability

POM (Delrin/Acetal) CNC machined parts with high stiffness and low friction

Precision POM CNC milled components for mechanical and automotive use

Custom POM CNC prototype parts with excellent dimensional stability

POM CNC turned bushings and spacers with smooth finish and tight tolerance

Material Machining Guide

POM CNC Machining: Selection, Process, and Quality Notes

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

Good Fit

Use POM when the application benefits from excellent machinability and dimensional stability 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 POM
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 POM With Nearby CNC Materials

ABSlow cost, impact resistance, and easy machining Acrylicoptical clarity and polished appearance Delrindimensional stability, low friction, and strong machinability 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 TECAFORMAHstable acetal performance and clean machining

FAQ

Is POM suitable for CNC machining?

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

What should I send for a POM machining quote?

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

Can POM 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 POM 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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