No need to know the vocabulary first
A few words, explained
- CNC
- Computer numerical control: a computer directs a cutting machine.
- Workholding
- The way you keep a piece securely in place while working on it.
- Feed rate
- How quickly a cutting tool moves along the material.
- RPM
- Revolutions per minute: how many full turns a tool makes each minute.
Choose tooling and settings for acrylic
Use the material and tool manufacturer's guidance, then test conservatively. A setting that creates chips and clears them can behave very differently from one that rubs, heats, and melts the edge.
Protect the sheet and hold it flat
Use an appropriate holding method and consider the protective surface where suitable. Avoid a setup that lets a thin sheet chatter, lift, or release near a final cut.
Inspect the chips and edge after each change
Watch for melting, welding, chipping, chatter, and surface scratches. Change one variable at a time and document the successful combination for that exact acrylic and bit.
Shop 101
Apply this reference to your project
Use your own project measurements and record how the result affects the material, setup or estimate.
- Name the material, dimension, or cost input that affects the decision.
- Use the reference and related calculator to check the measurement or estimate.
- Test or compare the result before committing final material, time, or client scope.
Try it with your own numbers
Common questions
Why does acrylic melt on a CNC?
Heat can build when the bit rubs instead of making and clearing chips. Bit geometry, feed, RPM, depth, tool condition, and chip clearing all affect the result.
Can I use wood CNC settings for acrylic?
Do not assume so. Acrylic has different heat and chip behavior. Start from material and tooling guidance, then test on matching scrap.
Should I leave protective film on acrylic?
Follow the material supplier's guidance and test the full process. The film can protect surfaces in some operations, but it also changes what is present at the cut.