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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Textured Acrylic Sheet
Will the texture affect the cutting accuracy?
No, we use CNC compensation technology to ensure ±0.5mm accuracy.
What thickness is recommended for outdoor use?
Recommended ≥5mm (need to cooperate with UV treatment).
Acrylic Magnetic Frame
Can I order a custom size?
Yes, custom dimensions are supported.
Acrylic Mirror Sheet
How to clean acrylic mirrors?
Use mild soap water + microfiber cloth. Avoid ammonia-based cleaners.
Acrylic LED Lightbox Signs
Can I customize the size and color?
Yes, we offer full customization on size, thickness, and color to meet your needs.
Premium Acrylic Photo Frame Block for Weddings, Portraits & More
This product is perfect for all types of images such as wedding photos, family or single portraits, random images or natural or holiday photos, and makes a wonderful gift idea. Please ensure your image is in proportion for this size so you do not have to crop the image. The acrylic mounting block you are ordering comes ready to display and is cut from 2 cm clear Perspex with diamond-polished edges.
Acrylic 3D Letter Signs — Custom-Made, Eye-Catching, and Ready in 7 Days
Our acrylic 3D letter signs are crafted to make your brand stand out with bold, dimensional impact. Designed for commercial signage and branding purposes, these signs are made from high-quality cast or extruded acrylic, offering a sleek finish, excellent durability, and vibrant color options. Whether for indoor walls or outdoor facades, we provide tailored solutions that reflect your unique identity—with fast turnaround times of just 7 days for most custom projects.
Wholesale Acrylic Mirror Sheets for Business | Bulk Orders & OEM Solutions
Our acrylic mirror sheets are made from 100% virgin PMMA material, offering superior reflectivity (up to 92%) while being 50% lighter and 10x more impact-resistant than traditional glass mirrors. Available in silver, gold, and bronze reflective finishes.
Optical-Grade Clear Acrylic Sheets – 92% Light Transmission | Cast & Extruded Options
We offer optical-grade clear acrylic sheets with up to 92% light transmission and the clarity of glass, but at half the weight and with greater impact resistance. The products are manufactured from pure new PMMA raw material, available in casting process (high precision) or extrusion process (cost-effective), with a thickness range of 1mm-30mm, and support for customized sizes and surface treatments.
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Email: sales@chinaplas-material.com
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