CNC Acrylic Machining: The Ultimate Guide for Precision Plastic Parts
Acrylic (PMMA) is one of the most widely used transparent plastics in CNC systems, offering superior advantages over polycarbonate and glass. Its versatility makes it ideal for industries ranging from automotive to medical. This guide covers everything from material properties to machining best practices.
What is Acrylic (PMMA)?
Acrylic, or poly(methyl methacrylate) (PMMA), is a rigid, transparent thermoplastic. Known as a shatter-resistant alternative to glass, it’s available in pellets, sheets, or extruded forms. Key features include:
· High optical clarity (92% light transmission)
· UV stability for outdoor use
· Recyclability and chemical resistance
Why Choose CNC for Acrylic Machining?
CNC machining delivers precision-cut acrylic parts with:
✔ Tight tolerances (±0.1mm)
✔ Smooth edges (minimal post-processing)
✔ Complex geometries (laser cutting, milling, engraving)
Acrylic Properties for CNC
|
Property |
Value |
Advantage |
|
Density |
1.17–1.20 g/cm³ |
Lightweight yet durable |
|
Surface Hardness |
85–105 Rockwell M |
Scratch-resistant |
|
Thermal Expansion |
0.07mm/m·°C |
Requires machining compensation |
CNC Acrylic Machining Processes
1. CNC Milling & Routing
· Best for: Signage, displays, prototypes
· Tool Tip: Use single-flute carbide bits to reduce melting.
2. Laser Cutting
· Best for: Intricate designs (e.g., retail fixtures)
· Settings: Low heat input prevents edge yellowing.
3. Injection Molding
· Best for: High-volume parts (e.g., lenses, knobs)
· Mold Design: Include draft angles (1–2°) for easy release.
Top 5 CNC Acrylic Machining Tips
1. Minimize Heat Buildup
2. Use compressed air to cool cuts. Optimize feed rates (e.g., 1.5 m/min for 3mm sheets).
3. Avoid Cracking
4. Drill holes ≥3x material thickness from edges. Anneal parts post-machining for stress relief.
5. Achieve Optical Clarity
6. Polish edges with flame polishing or diamond buffing.
7. Select the Right Acrylic Type
8. Extruded: Cost-effective for simple shapes. Cell-cast: Superior for precision optics.
9. Use Solvent Bonding for seamless joints (e.g., Weld-On #4).
10. Applications of CNC Acrylic Parts
|
Industry |
Uses |
|
Automotive |
Tail lights, dashboards, windshields |
|
Medical |
Incubators, surgical tools, dentures |
|
Architecture |
Skylights, sound barriers, facade panels |
|
Retail |
Display cases, POS stands, signage |
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FAQs
What international standards does the product quality meet?
The products have passed ISO, CE and other certifications, and meet the building material standards of Europe, America, the Middle East and other regions, and provide third-party inspection reports.
Quality & Warranty
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Customization & Manufacturing
Can you cut, drill, or bend acrylic sheets to my specifications?
Samples & Prototypes
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Product-Related Questions
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Foshan Chinaplas Material Co.,ltd
Foshan Chinaplas Material Company Limited
FOSHAN CHINAPLAS MATERIAL CO.,LTD
Foshan Chinaplas Material Co.,ltd
CHINAPLAS ACRYLIC
Whatsapp: +8613927780518