Take a look at an example of some PTFE (teflon) turning we do at East Coast Precision Manufacturing. The part you see here is thin walled. It features a OD grooving with a notched feature on one end.
PTFE is often used in the electrical and chemical industries. It is very chemical resitant, stable, and a good insulator.
Teflon machining is one of our core competencies here at East Coast Precision. We have been working with it for a long time and look foward to quoting on your teflon work today!
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Tags: bore, contour, lathe, machined plastic, ptfe, slot, teflon, turned

This was interesting. You might want to check out http://www.toefco.com.