Polycarbonate demands a process built around its properties — not a generic plastic workflow. VMT’s CNC machining polycarbonate service is developed specifically for PC: no stress cracks, no surface haze, no tolerance drift. From prototype to production, your parts arrive right.
From enclosures that need optical clarity to structural components that take impact, polycarbonate CNC milling and turning handles the full range. Every part is machined to your drawing, your tolerances, and your surface requirements.
Complex internal geometry machined to tight tolerances in clear PC, with vapor polished surfaces for full optical clarity.
Two piece clear PC chamber with precision threaded lid and internal flow features, machined for leak-free assembly.
Black PC structural bracket with precision bore and mounting holes, machined for exact sensor or optical component positioning.
Clear PC circular tray with multiple precision-bored lens seats, machined for repeatable optical alignment across all positions.
Black PC enclosure with integrated side port and rectangular aperture, machined for sealed electrical or sensor installations.
Two piece clear PC medical housing with precision threads and internal spherical seat, machined to tight tolerances for sterile assembly.
Black PC lens mount with precision bore and clip features, machined for secure optical component installation in camera and imaging systems.
Black PC cylindrical barrel with stepped profile and end face mounting holes, polished to achieve a smooth metallic surface finish after machining.
Clear PC square plate with precision center bore and integrated standoff studs, machined for stable optical component alignment in laboratory and imaging equipment.
Residual stress builds up during cutting and triggers delayed cracking days or weeks after assembly, long after the part has passed visual inspection. Here is how we prevent it.
Polycarbonate expands and contracts with heat, and a standard machining workflow treats it like any other plastic. That is where tolerance drift starts. Here is how we keep it under control.
| Capability | Specification |
|---|---|
| Dimensional Tolerance | ±0.05 mm |
| Surface Finish (Ra) | 0.4 μm |
| Feature Position | ±0.02 mm |
| Max Part Size | 400 mm |
| CNC Axes | 3 / 4 / 5 Axis |
| Machining Processes | Milling, Turning, Drilling, Tapping, Boring, Stress Relief Annealing |
| Material Grades | Clear, Black, GF20 |
| Surface Finish Options | As Machined, Bead Blasting, Painting, Polishing, Vapor Polishing |
Choosing the right grade affects clarity, strength, and machinability. Here is a quick comparison to help you decide before submitting your drawing for polycarbonate machining services.
| Grade | PC Clear | PC Black | PC GF20 |
|---|---|---|---|
| Transparency | High | None | None |
| Impact Resistance | High | High | Medium |
| Tensile Strength | 55 MPa | 55 MPa | 75 MPa |
| Heat Deflection Temperature | 120°C | 120°C | 140°C |
| Surface Finish (Ra) | 0.4 μm | 0.4 μm | 0.8 μm |
| Relative Cost | $ | $ | $$ |
| Best For | Optical covers, light guides, inspection windows | Structural housings, brackets, mechanical components | High-rigidity parts, load-bearing components |
Choosing the right finish for polycarbonate custom machined parts depends on whether your priority is optical clarity, surface protection, aesthetic appearance, or cost. VMT supports the following surface treatments for CNC machined polycarbonate:
Polycarbonate behaves differently from metal and standard plastics at every stage of machining. Our engineering team reviews every drawing before production starts, catching issues before they become real problems.
Every part is different. Submit your drawing for a free DFM review before production starts.
Polycarbonate responds to heat and stress differently from metal. Our inspection process is built around these specific variables, so every polycarbonate CNC machining parts order leaves our facility documented and verified.
Which polycarbonate grade is best for optical applications?
Clear PC is the standard choice for optical applications, offering high light transmission and a surface finish down to Ra 0.4μm after vapor polishing. For higher rigidity requirements, GF20 is available but sacrifices transparency. Submit your drawing and we will recommend the right grade for your custom polycarbonate parts.
How long does it take to get a polycarbonate part quoted and produced?
Most CNC machining polycarbonate quotes are returned within 24 hours of drawing submission. Production lead time runs 7 to 14 business days depending on part complexity and surface treatment requirements.
How does polycarbonate compare to acrylic for CNC machining?
Polycarbonate offers significantly higher impact resistance and handles stress better during cnc cutting polycarbonate operations. Acrylic is more brittle but produces cleaner edges and lower cost. For functional parts requiring durability, PC is the stronger choice.
What file formats does VMT accept for quoting?
VMT accepts STEP, IGES, DXF, DWG, and PDF formats for polycarbonate cnc quoting. STEP files are preferred as they carry full 3D geometry and tolerance information. 2D drawings in PDF are recommended as a supplement.
Can polycarbonate parts be painted or coated after machining?
Yes. Polycarbonate mechanical parts support a range of post-machining finishes including painting, hard coating, UV coating, anti-fog coating, and water transfer printing. Surface preparation is handled in-house before any coating is applied.
Is there a minimum order quantity for polycarbonate CNC parts?
There is no minimum order quantity for cnc polycarbonate cutting. VMT machines single prototypes through to production runs, with the same inspection and documentation standards applied at every volume.
Most shops treat PC like any other plastic. Wrong speeds, wrong tooling, no stress relief after cutting. The white patches and surface haze you see are the result of that — not a material defect, not bad luck.
At VMT, every cnc polycarbonate job runs with parameters built specifically for PC. Cutting heat stays controlled. Residual stress gets annealed out before the part ships. Where optical clarity matters, vapor polishing brings the surface back to spec.What you receive is a part that looks right, measures right, and goes straight to your assembly line.
Transparency doesn’t survive a bad machining process. Heat buildup, wrong coolant, and aggressive tool paths all leave their mark. Haze, micro-scratches, and a surface that looks nothing like the material you specified.
At VMT, polycarbonate CNC machining treats optical clarity as a measurable output, not an afterthought. Cutting parameters are dialed for PC, coolant application is controlled to avoid thermal shock, and surface roughness is verified against your drawing before the part moves to finishing. Where clarity needs to be fully restored, vapor polishing is available as a final step.The part you receive is the part you designed: transparent where it needs to be, to the finish your application requires.
Upon receiving your 3D CAD file, our dedicated customer service engineer will thoroughly review your design for manufacturability, ensuring it meets your precise specifications and budget requirements. Contact us today for a free quote!
