PMMA (Acrylic) CNC Machining Services On Aria
PMMA (polymethyl methacrylate), commonly known as acrylic, offers exceptional optical clarity, weather resistance, and versatility—ideal for prototypes, displays, lenses, and industrial components.
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Why Choose CNC Machining for PMMA?
Optical Perfection
Mirror-smooth finishes with minimal post-processing
Tight Tolerances
Tolerances(±0.1mm)Precision cut parts for demanding applications.
Fast Turnaround
Prototypes in days, production runs in weeks.
Design Freedom
Complex geometries, engraving, and edge-lit features.
What is PMMA (Acrylic) CNC Machining?
CNC (Computer Numerical Control) machining removes material from an acrylic sheet or block using high-speed milling, drilling, or turning operations.
The process involves:
- CAD Design – A 3D model guides the CNC machine’s toolpaths.
- Precision Cutting – Specialized tools carve the acrylic with minimal heat buildup to prevent melting or cracking.
- Finishing – Optional polishing, flame treatment, or coatings enhance clarity and aesthetics.
CNC Machined Acrylic (PMMA) Material Properties
Tensile Strength
Elongation at Break
Tensile Modulus
Flexural Strength
Hardness, Rockwell
Test Method
ASTM D638
ASTM D638
ASTM D638
ASTM D790
ASTM D785
Machined Arylic
8,038 psi
2.7%
350,000 - 500,000 psi
12,000 psi
M80 - M100
Acrylic (PMMA) CNC Machining Parameter
Parameter
Typical Value
Description
Spindle Speed
12,000–18,000 RPM (for small tools)
Lower speeds (8,000–12,000 RPM) for larger tools to avoid melting.
Spindle Power
3–10 kW
Higher power for heavy material removal.
Feed Rate
1,000–3,000 mm/min (40–120 in/min)
Adjust based on tool diameter and depth of cut.
Cutting Depth
≤0.5 × Tool Diameter (per pass)
Deeper cuts risk chipping; use multiple shallow passes.
Cutting Width
0.2–0.5 × Tool Diameter (stepover)
Smaller stepovers improve surface finish.
Machining Accuracy
±0.05–0.1 mm (standard), ±0.02 mm (high-precision)
Depends on machine rigidity and tool condition.
Surface Roughness
Ra 0.8–3.2 µm (unpolished)
Can achieve Ra <0.4 µm with post-polishing.
Tool Type
Single-flute or double-flute carbide end mills
Sharp, polished edges reduce heat buildup.
Tool Diameter
1–10 mm (common), up to 25 mm for roughing
Smaller tools for fine details; larger for bulk removal.
Coolant Type
Compressed air or mist coolant
Avoid water-based coolants (can cloud acrylic).
Chip Load
0.05–0.15 mm/tooth
Too low causes melting; too high risks cracking.
Ramp Angle
≤5° (for plunging)
Steeper angles increase tool stress.
Stepover
30–50% of tool diameter
20% for mirror finishes; 60% for roughing.
FAQs
Q: How does PMMA compare to polycarbonate?
Q: Can you machine acrylic without cracking?
Q: Is polishing necessary for transparent parts?
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