Need high clarity, lightweight precision acrylic parts? VMT delivers acrylic CNC machining to tolerances of ±0.01mm, using cast acrylic exclusively. Your parts stay dimensionally stable, crack-free over time, and ready to assemble straight out of the box. Precision and aesthetics in every part we deliver.
With 16 years of precision CNC machining experience, we have produced cnc acrylic parts for customers in automotive lighting, medical devices, aerospace, and optical instrumentation. From complex geometries to demanding surface requirements, every part is built to your exact drawings. Send us your files and we will make it happen.
| Capability | Details |
|---|---|
| Lead Time | 1~10 days |
| Wall Thickness | 0.5mm (0.0197″) |
| Tolerances | ±0.01mm (±0.0004″) |
| Min Part Size | 1×1×1mm (0.039×0.039×0.039″) |
| Max Part Size | 130×63.5×63.5cm (51.1×25×25″) |
| Material Colors | Clear / Black / White |
| Machining Options | CNC Milling (3 axis / 4 axis / 5 axis) / CNC Turning / Waterjet Cutting |
| Secondary Operations | Thread Tapping / Heat Staking Insert / Heat Bending / Adhesive Assembly |
| Surface Finishing Options | Standard (As-Milled) / Bead Blasting / Polishing |
Many machine shops use extruded acrylic to cut costs. Unlike cast acrylic, extruded acrylic is forced through a die at high speed, leaving directional internal stress built into the material. Under machining heat, this stress releases, causing warping, melted edges, and micro-cracking (crazing) during post-processing like vapor polishing.
At VMT, we use only virgin cast acrylic (PMMA), formed by slow curing in molds for uniform molecular structure, low internal stress, and consistent optical quality. Each batch comes with a Material Test Report (MTR), and every sheet undergoes incoming spectral analysis to verify material identity before machining begins. This ensures your CNC acrylic parts are dimensionally stable, with smooth, burr-free edges, and able to maintain strict tolerances over a long period of time.
Surface hazing on acrylic is almost always a machining process problem. Excessive cutting speed generates heat at the tool-material interface, melting the surface at a microscopic level and leaving that characteristic white, cloudy appearance.
At VMT, we control this through optimized cutting parameters specific to acrylic, including lower spindle speeds, sharp single-flute or double-flute end mills, and consistent coolant application to keep temperatures stable throughout the cut. For parts with optical clarity requirements, we follow machining with manual wet sanding and flame or vapor polishing to restore full transparency, delivering a finish that is smooth, clear, and true to your design intent with no secondary rework needed on your end.
Acrylic crazing isn’t just a machining issue; it’s an unresolved stress disaster. Micro-cracks propagate when aggressive tool vibration generates localized frictional heat, or when incorrect drill-exit feeds induce mechanical breakout. Worst of all, residual stresses inevitably trigger catastrophic cracking the moment your parts contact alcohol or assembly lubricants.We stop cracking at the source through strict process control:
Acrylic has a thermal expansion coefficient significantly higher than most metals, meaning temperature fluctuations during machining directly affect dimensional accuracy. A part that measures within tolerance on the machine can drift out of spec by the time it reaches room temperature.
At VMT, we manage this through temperature-controlled machining environments, staged cutting strategies that minimize heat buildup, and in-process measurement at key dimensions to catch drift before it becomes a problem. Every finished part is measured at stable ambient temperature before leaving our facility, ensuring your parts arrive within the tolerances specified on your drawings and ready for assembly without adjustment.
Transparent acrylic surfaces scratch easily, and a single contact point during transit can render an otherwise perfect part unusable. Standard bulk packaging is not designed with clear parts in mind.
At VMT, every acrylic part is individually wrapped in protective film immediately after final inspection, cushioned in pearl cotton, and packed in separate compartmentalized layers to prevent any part-to-part contact during shipping. Every order is packed to the same standard we apply to our own inspection process, so parts arrive in the same condition they left our facility.
The following mechanical properties apply to cast acrylic (PMMA) used in our acrylic CNC machining services, tested in accordance with ASTM standards.
| TENSILE STRENGTH | ELONGATION AT BREAK | TENSILE MODULUS | FLEXURAL STRENGTH | HARDNESS (ROCKWELL) | HEAT DEFLECTION TEMPERATURE | LIGHT TRANSMITTANCE | |
|---|---|---|---|---|---|---|---|
| Test Method | ASTM D638 | ASTM D638 | ASTM D638 | ASTM D790 | ASTM D785 | ASTM D648 | ASTM D1003 |
| Cast Acrylic (PMMA) | 8,038 psi (55 MPa) | 2.7% | 350,000~500,000 psi (2,400~3,400 MPa) | 12,000 psi (83 MPa) | M80~M100 | 185°F (85°C) | 92% |
CNC machined acrylic rarely requires surface finishing, as most treatments would compromise the material’s inherent optical clarity. Where a finish is needed, we recommend options that enhance rather than obscure these properties.
The default finish straight off the machine. Cut faces may show light swirl patterns from tool paths. Suitable for structural or non-optical applications where surface appearance is not a priority.
Produces a uniform matte frosted appearance across all surfaces, effectively concealing tool marks. Recommended for parts where a diffused, non-reflective finish is preferred over optical clarity.
Restores full optical transparency through manual wet sanding, vapor polishing, or mechanical buffing. Recommended for display panels, optical components, and any application where crystal-clear surfaces are required. Available at additional cost.
We back the quality of our acrylic CNC machining services with international certifications and a rigorous inspection process built specifically for transparent and optical-grade components.
To ensure every acrylic CNC part meets your specifications, we follow a dedicated quality process:
We combine international certifications with rigorous protocols to ensure every acrylic CNC machining part meets your standards:
Our team of 6 experienced engineers reviews every acrylic CNC machining parts project before production begins, providing DFM feedback to help you avoid costly redesigns. Here are the key design parameters we work within:
● Min Wall Thickness
0.5mm (0.02in)
● Min End Mill Size
0.8mm (0.03in)
● Min Drill Size
0.5mm (0.02in)
● Max Part Size
130×63.5×63.5cm
● Internal Corner Radius
≥0.5mm
● Radii : Depth
Max 10x drill diameter
Can you machine acrylic to optical-grade clarity?
Yes. We follow optimized cutting parameters and offer manual wet sanding and flame polishing as post-processing options for our CNC acrylic service, restoring full transparency and delivering optical-grade surface quality where required.
What industries use CNC machined acrylic parts?
Our acrylic CNC machining parts are used across automotive lighting, medical devices, aerospace, optical instrumentation, and consumer electronics. Any industry requiring lightweight, transparent, and dimensionally stable components can benefit from precision acrylic machining.
Do you provide material test reports for acrylic parts?
Yes. Every order of acrylic CNC machining parts includes a Material Test Report (MTR) confirming the cast acrylic grade used. We also perform incoming spectral analysis to verify material identity before machining begins.
What is the lead time for CNC acrylic parts?
Standard lead time for acrylic CNC machining is 1 to 10 days depending on part complexity, quantity, and surface finish requirements. Contact us with your drawings for a precise timeline.
Can you handle both prototype and production quantities?
Yes. Our acrylic CNC machining services support both single prototype runs and high-volume production orders with no minimum order quantity, giving you full flexibility at every stage of your project.
How do I get a quote for CNC acrylic machining?
Simply upload your 2D or 3D drawings to our instant quoting platform. Our team reviews every acrylic CNC machining project within 4 hours and provides a quote with DFM feedback included at no extra cost.
Acrylic and glass share similar optical clarity, but differ significantly in weight, machinability, and impact resistance. For most precision part applications, acrylic offers practical advantages that glass cannot match.
| Property | Acrylic (PMMA) | Glass |
|---|---|---|
| Weight | Light (1.18 g/cm³) | Heavy (2.5 g/cm³) |
| Light Transmittance | 92% | 90% |
| Impact Resistance | 10x stronger than glass | Brittle, shatters on impact |
| Machinability | CNC machinable to ±0.01mm | Difficult to machine precisely |
| Cost | Lower | Higher |
| Chemical Resistance | Moderate | High |
For applications requiring lightweight, tight tolerances, and complex geometries, acrylic is the preferred choice. Glass remains suitable where extreme chemical resistance or high-temperature performance is the priority.
Acrylic performs well in most industrial environments, but contact with certain chemicals can cause surface crazing, stress cracking, or complete structural failure. Before specifying acrylic for your application, verify that your operating environment does not involve the following:
Avoid exposure to:
Acrylic is generally compatible with water, mild detergents, and diluted inorganic acids. If your application involves chemical exposure, consider polycarbonate (PC) as an alternative. Our engineering team can advise on material selection as part of the DFM review process.
