CNC turning is the ideal manufacturing process for producing precision cylindrical components from engineering plastics. From bushings and bearings to seals and shafts, CNC turning delivers exceptional accuracy and surface finish.
When to Choose CNC Turning
CNC turning excels when your part has rotational symmetry—round, cylindrical, or conical shapes. Common applications include:
- Bearings and bushings — nylon and POM offer self-lubricating properties
- Seals and gaskets — precision tolerances for leak prevention
- Shafts and rollers — conveyor systems, printing equipment
- Fittings and connectors — fluid handling, pneumatic systems
Material Selection for Turned Parts
Nylon vs POM comparison helps determine the best material for your application. Key considerations:
| Property | Nylon | POM |
|---|---|---|
| Friction Coefficient | 0.2-0.4 | 0.1-0.3 |
| Dimensional Stability | Moderate | Excellent |
| Moisture Absorption | Higher | Lower |
Frequently Asked Questions
What tolerances are achievable with CNC turning?
Standard tolerances of ±0.05mm are routine. With precision equipment and controlled conditions, ±0.01mm is achievable for critical dimensions.
Can CNC turning create threads in plastic?
Yes. Single-point threading produces accurate threads in engineering plastics. Thread milling is an alternative for larger threads or hard materials.
How do I prevent chatter when turning plastics?
Use sharp tools with positive rake angles, reduce overhang, and optimize spindle speed. Plastics require different cutting parameters than metals.
What post-processing is needed for turned plastic parts?
Deburring is typically sufficient. For improved surface finish, polishing or tumbling can be applied. No heat treatment is required.
