Short answer: There is no safe universal feed-and-speed table for acrylic. Start from cutter diameter, flute geometry, tool manufacturer data, spindle limits, engagement, material grade and workholding. The useful target is a stable chip—not dust or melted smear—then confirm edge quality and dimensions on the real setup.
A useful supplier discussion starts with the failure that must be prevented, the condition in which the part will operate, and the evidence that will be used for acceptance. AcrylicFabWorks has fabricated custom PMMA components since 2014 in an ISO 9001-certified, 15,000 m² facility. Our documented equipment includes eight 3-axis CNC machining centers and one 5-axis center. These firsthand manufacturing observations inform the notes below, but quoted material grade, drawing revision and project-specific test evidence remain controlling.
CNC feeds and speeds: starting points for acrylic
A useful review of acrylic machining feed rate starts with the part’s function, material grade, thickness, dimensions, environment, load, expected access, cosmetic faces and inspection method. Where a safety function, chemical exposure or regulated installation is involved, assign an engineer or qualified compliance professional to approve the requirement.
This guide stays within one practical decision: method for establishing acrylic cutting parameters. Manufacturing capacity, pricing and lead-time questions are covered on the linked capability or product page. Keeping the engineering question separate helps the reader reach a decision without mixing it with purchasing details.
| Situation | Best-fit use or concern | What to verify |
|---|---|---|
| Chip is powdery | Feed per tooth may be too low or edge dull | Check tool and increase chip load cautiously |
| Chip rewelds | Heat or poor evacuation | Improve evacuation; review speed and feed together |
| Chatter marks | Low rigidity or unstable engagement | Review fixture, stick-out and tool path |
| Clean continuous chips | Cutting rather than rubbing | Confirm temperature, finish and size |
Tool geometry and chip control
Use the following sequence during design review. It prevents a cosmetic preference from overriding a functional requirement and gives the supplier a testable acceptance condition. For custom work, AcrylicFabWorks follows GB/T 1804-2000 / ISO 2768-1 for unspecified general tolerances; actual tolerances still depend on the feature size, geometry, material condition and drawing review.
- Identify exact resin, stock type, thickness and tool manufacturer's range.
- Calculate chip load from feed, RPM and engaged cutting edges.
- Begin with a conservative test coupon using the production fixture.
- Change one variable at a time while recording chip and edge condition.
- Lock the proven tool, operation, setup and inspection method in the job traveler.
Do not release production from an illustrative table alone. A sample or first article should reproduce the real resin, thickness, feature geometry, support, process sequence and inspection lighting. If the part will be bonded, cleaned, loaded, heated or installed outdoors, include that downstream exposure in the validation plan. For production orders, our MOQ is 20 pieces per design and specification; samples and one-off prototypes are quoted separately.
What our factory reviews before quoting
Our review of CNC parameters starts from tool geometry: single-flute or O-flute carbide cutters with polished flutes for chip evacuation, 2-flute for finishing. For acrylic, we start at 12,000–18,000 RPM spindle speed with feed rates of 1,500–3,000 mm/min for 6 mm sheet, adjusting for thickness and feature size. Chip load is kept high enough to cut (not melt) but low enough to avoid chipping edges. We confirm coolant or air-blast cooling and climb milling for clean edges on production parts.
What changes when sheet is thick
For this guide on CNC feeds and speeds for acrylic, the failures that matter most in production and service are:
- Check: Copying router settings without matching cutter or engagement.
- Check: Raising RPM alone when the process is already rubbing.
- Check: Using recut chips as evidence of a material problem.
- Check: Optimizing surface appearance while ignoring dimensional drift from heat.
How to verify the result
Agree on inspection before production. State the instrument or visual setup, sample conditioning, viewing distance, lighting, measurement locations and acceptance rule. Save the approved sample and process record with the drawing revision. If a result changes, compare resin lot, tool or adhesive lot, machine setup, environment and test method before changing the specification. This evidence trail is more useful than an unsupported performance claim and makes later supplier or customer reviews much faster.
Related engineering and purchasing resources
- Acrylic CNC machining tolerance guide
- How to request a fabrication quote
- ISO 9001 quality-control process
- Acrylic fabrication FAQ
Primary references
- Plaskolite OPTIX continuous-cast acrylic fabrication guide. Confirm the current edition, scope and applicability for the project.
- ACRYLITE drilling fabrication guidance. Confirm the current edition, scope and applicability for the project.
Related engineering guides
Review your drawing with an acrylic fabricator
If the decision in this guide affects a production part, send the drawing, application conditions and acceptance criteria. See our custom CNC acrylic machining page, then request a manufacturability review. Typical samples can be produced in 48 hours and production in 7 days after drawing approval when the project scope supports that schedule.
Frequently asked questions
Q: What RPM should I use for acrylic? A: RPM cannot be chosen alone; tool diameter, flute count, feed, engagement and machine limits determine the cutting condition.
Q: Why does acrylic melt during CNC cutting? A: Rubbing, a dull edge, recutting chips, excessive engagement or inadequate evacuation commonly create heat.
Q: Should acrylic chips be dust? A: A stable cutting process normally forms identifiable chips; fine dust can indicate rubbing or an unsuitable tool, although operation details matter.
Editorial boundary: This article provides manufacturing and specification guidance. Safety, code, electrical, fire and regulatory decisions remain with the responsible project professionals and relevant authorities.