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How to Improve Accuracy in CNC Machining Plastic Parts

2026-02-14

How to Improve Accuracy in CNC Machining Plastic Parts? | Practical Factory Guide

Introduction – Why Plastic CNC Parts Often Miss Tolerance

If you have ever machined aluminum successfully and then switched to plastic CNC machining, you probably noticed something frustrating:

The same program suddenly produces:

oversize holes
warped surfaces
melted edges
±0.2 mm deviation

We faced exactly this issue three years ago when producing POM (Delrin) precision gears for an automation customer.
The drawing tolerance was ±0.02 mm, but our first batch averaged ±0.08 mm — 4× out of spec.

After dozens of trials and real production adjustments, we reduced deviation to ±0.015 mm stable mass production.

In this guide, we’ll share the actual factory methods, tested parameters, and tooling solutions we use daily to improve:

plastic machining accuracy
dimensional stability
surface finish
repeatability

So you can avoid scrap and hit tolerance the first time.

H2 – Why Plastic Parts Are Harder to Machine Than Metal?

Before fixing accuracy, you must understand the physics.

Plastics behave completely differently from metals:

Property	Metal	Plastic
Thermal expansion	Low	3–8× higher
Stiffness	High	Flexible
Heat resistance	High	Easy melting
Chip removal	Stable	Sticky/stringy
Stress recovery	None	Elastic rebound

Real impact in machining:

Heat → expansion → oversize parts
Clamping → deformation → shape spring-back
Tool friction → melting → poor tolerance

Shenzhen Perfect Precision Product Co., Ltd.

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How to Improve Accuracy in CNC Machining Plastic Parts

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