PTFE can be machined to extremely close tolerances but comes with a few nuances you should be aware of. Here are three tips for machining PTFE:
- When holding PTFE sheet, rod or tube in place for machining, make sure the holding jig or fixture distributes forces evenly. PTFE is soft and vulnerable to deformation under the strong force of a vice grip.
- While non-cooled high-speed steel drill bits and router bits may work for virgin and unfilled PTFE, filled PTFE grades generally require carbide tooling. PTFE also responds well to coolants due to high moisture and chemical resistance.
- When drilling, use a high feed rate and consider using air to blow away chips. Leave plenty of room for chips to eject. Interstate Plastics recommends Onsrud HHS High-Speed Drill Bits, available online or over the phone.
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