CUStom Acrylic / PMMA Part
Custom CNC Machining Acrylic
Acrylic—technically known as PMMA—combines optical clarity, weather resistance and low weight. When CNC machining acrylic, we control cutting heat and clamping to produce precision windows, light guides, covers and manifolds from prototypes to repeat production.
Upload Your DrawingAcrylic / PMMA Material Data
Key Mechanical and Optical Parameters
Representative room-temperature values for general-purpose clear PMMA. Confirm the selected supplier grade before final design approval.
Optical, impact-modified, UV-resistant and medical PMMA grades use formulation-specific values and certification.
Machining Capability
Typical Acrylic CNC Machining Capability
Our capability for CNC machining acrylic covers milled and turned cast or extruded PMMA components.
| Maximum work envelope | 3000 × 1200 × 850 mm |
|---|---|
| Typical dimensional tolerance | ±0.1 mm |
| Selected precision features | ±0.05 mm after engineering review |
| Typical minimum wall thickness | 2.0 mm |
| Minimum internal radius | From R0.5 mm, subject to tool access |
| Machined surface roughness | Ra 0.8–5 µm |
Final capability depends on grade, stock thickness, geometry, fixturing, optical finish and inspection method.
Acrylic Forms & PMMA Grades
Select the Right Acrylic Material for Your Part
Match the stock form and formulation to optical quality, impact demand, weather exposure and compliance requirements.
Cast Acrylic (PMMA)
Lower residual stress than extruded sheet supports detailed machining and polished optical surfaces.
Extruded Acrylic (PMMA)
Consistent sheet thickness and economical availability suit panels and simpler profiles with moderate tolerances.
Optical-Grade PMMA
Controlled transmission, haze and material uniformity support demanding optical components.
Impact-Modified Acrylic
Modified PMMA improves impact resistance where standard acrylic is too brittle.
Colored & UV-Resistant PMMA
Tinted, opaque and UV-stabilized options control appearance, light transmission and outdoor durability.
Medical & Dental PMMA
Documented grades support medical, dental and laboratory parts with controlled biocompatibility or cleanliness requirements.
Machined Acrylic Projects
Custom CNC-Machined Acrylic and PMMA Parts
Prototype and repeat-production components machined and inspected to your drawing.
Clarity, Texture & Graphics
Surface Finishes for Acrylic and PMMA Parts
Select the finish according to transparency, glare, texture, branding and scratch-resistance requirements.
As-Machined
Controlled cutting leaves a functional surface with visible tool marks.
Mechanical Polishing
Removes fine machining marks and restores a clear gloss.
Diamond Polishing
Produces controlled optical edges and flat surfaces.
Frosted Finish
Creates a uniform matte texture and diffuses light.
Printing & Marking
Adds permanent text, scales, logos or graphics.
Hard Coating
Improves scratch resistance or adds anti-glare performance.
Process & Quality Control
From Drawing Review to Final Inspection
For CNC machining acrylic, optical faces, residual-stress risks, tolerances and inspection requirements are defined before production.
DFM Review
Grade, geometry, tolerances and optical faces are confirmed before machining.
Stress Control
Sharp tooling, light clamping and controlled heat reduce cracking and distortion.
Inspection
Critical dimensions, surface condition and specified optical features are checked.
Protected Delivery
Finished PMMA parts are cleaned, protected and packed to prevent scratches.
Acrylic Machining FAQ
Plan Your Custom Acrylic Parts
Practical answers about stress control, cutting tools, machining speed, threads and project cost.
How are cracking, crazing and residual stress controlled?
Use low-stress stock, sharp tools, light clamping and controlled cutting heat. Avoid incompatible coolants and apply a grade-specific annealing cycle when machining, polishing or bonding may expose residual stress.
What type of CNC bit is best for cutting acrylic?
A sharp, polished carbide O-flute or single-flute cutter provides clean chip evacuation and limits heat. Polished two-flute carbide tools suit rigid milling operations.
What is the best CNC cutting speed for acrylic?
For 3–6 mm carbide router tools, 12,000–20,000 rpm is a practical starting range. Feed must form clean chips instead of dust while preventing edge melting.
How can custom acrylic machining costs be reduced?
Use standard stock thicknesses, practical tolerances, adequate internal radii and consistent wall sections. Combining similar parts into one order also reduces setup cost.
Can threads be CNC machined into acrylic parts?
Yes. Coarse threads, adequate wall thickness and generous edge distance reduce cracking. Metal threaded inserts provide stronger joints for repeated assembly.