- Acrylic as machined
Component requires superior surface finish for device success. Critical profile eliminates secondary polishing operation as option.
Special designed tooling allows 10 - 16 micro inch finish as machined. Burnish tool cleans part and adds high gloss.
- Acrylic as CNC machined
Customer needs optical finish with low distortion for bubble & liquid visualization.
Cast acrylic has the highest light transmittance. Finish as machined with no secondary polishing.
- Direct machine acrylic polishing
Acrylic lens as machined. Customer requires no scratches for viewing through the long end of the part.
Acrylic Plastic Component
- Machined Plastic Medical Component
Electrophoresis Comb requires no burrs on well sites.
Good machining practice combined with bead blast finish leaves consistent tooth profile.
- Machined Polycarbonate Fitting
Medical device needs near sharp edge (.002-.006) for minimal dead space in blood flow path. No nicks or scratches.
Difficult application as processing through vapor polish can scrap part. Special handling procedures meets the customers quality requirements.
- Bead Blasted Polycarbonate
- Examples of Vapor Polishing of Polycarbonate
Polycarbonate Components, after vapor polishing to achieve optical quality finish.
- 20 Ra finish in Polypropylene
High visibility light pipe in a instrument needs high gloss/polish finish.
On machine plastic polishing consistently brings finish to 20 rms with no tooling marks or feed lines.
- Vapor Polishing, Ultem Machined Component
Customer needs best possible roller surface for tape drive. Ultem is selected for its low inertia with vapor polishing to reach under 20 rms surface finish
- Black Ultem Machining
Interior bead blasted, exterior vapor polished with laser engraving
- Noryl Bead Blasted Plastic
Engineers and designers often ask questions regarding surface finish in plastic machining. Usually, they have had a negative experience working with a metal shop or realize that a good, burr-free finish is essential to the success of the product.
With 20-plus years of experience, Connecticut Plastics will produce on average a 32 finish for most components and materials. This includes more difficult soft materials such as polypropylene and UHMW-PE. Machining without burrs is a cornerstone of our success. The surest way to manage burrs in plastic is to not make them.
Requirements for machined finishes below 32 are increasingly more difficult. In this range, material type and part configuration play a more dominant role. However, using proprietary tooling, a superior finish can be achieved with some materials. Values have reached 10-15 micro inches in certain instances.
Specialized tooling is also capable of near optical-quality finishing. Materials such as polycarbonate and acrylic can be machined clear. This process can be configuration limited, however, and is best suited for exterior work. Interior work — such as bores or cavities — have some success, while this technique is not applicable to features such as tapped holes.
Please see our polishing section for more information on finishes.