Have never done much machining of plastics, but I need to make up some
small parts that will be used in gasoline environment. Looking at the
softer plastics, such as nylon, delrin, teflon etc. Turning, milling,
tapping, possibly some external threading.

Do these plastics machine equally, or somewhat so? Any special
requirements as to clearance or rake angles, lubricants or speeds?

John Martin