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CNC machining materials

CNC Machining PMMA (Acrylic)

PMMA (Polymethyl Methacrylate), commonly called acrylic, is a transparent engineering thermoplastic known for excellent optical clarity, weatherability, surface appearance, dimensional stability, and relatively good CNC machinability. It is widely used for transparent covers, inspection windows, light guides, display components, optical prototypes, equipment guards, and custom enclosures.

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CNC Machined Parts from PMMA (Acrylic)

PMMA (Acrylic)

Description

Applications

CNC machining produces parts with excellent mechanical properties, accuracy and repeatability from metal and plastic. 3-axis & 5-axis CNC milling available.

Strengths

Excellent mechanical properties,High accuracy & repeatabillity

Weaknesses

Greater geometry restrictions than 3D printing

Characteristics

Price
Mill Lead Time

As fast as 3 days

Colors

Optically clear, opaque

Available material grades

CNC Machining Service for PMMA (Acrylic)
PMMA (Acrylic)

PMMA (Polymethyl Methacrylate),is a transparent engineering thermoplastic known for excellent optical clarity, weatherability, surface appearance, dimensional stability, and relatively good CNC machinability. It is widely used for transparent covers, inspection windows, light guides, display components, optical prototypes, equipment guards, and custom enclosures.

PMMA (Acrylic) FAQs

  • Can CNC cut acrylic?

    Yes, acrylic is a common material used in CNC machining. Acrylic is a scratch-resistant plastic, which in thin-walled areas can be fairly brittle. For this reason it isn’t ideal for parts that require delicate or complex shapes.

  • What are some CNC acrylic cutting tips?

    These five tips will help you avoid difficulties and maintain a smooth cut when using CNC to cut acrylic:
    To avoid vibration, make sure the workpiece is properly secured.
    Use a bit specifically designed to cut acrylic.
    Larger bit sizes tend to perform best
    Cut at a steady rate through the acrylic as quickly and steadily as you can while maintaining control.
    Keep the acrylic cool by putting it in a freezer for an hour prior to making the cuts.

  • What are common uses for acrylic in CNC?

    Acrylic is transparent and is frequently used as a lightweight substitute for glass or for light pipes. Other uses include plastic parts such as car lights, light tubes, tanks, panels and optical applications.

  • What is the cutting speed for acrylic?

    At least 18,000 RPMs is the recommended speed for cutting acrylic. Although higher speeds are possible, you may need to adjust your feedrate to prevent the material from melting from the heat. This also depends on the diameter of the tool being used.
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