When machining parts from Teflon® PTFE resins, either
manually or automatically, the basic rule to remember is
that these resins possess physical properties unlike those
of any other commonly machined material. They are
soft, yet springy. They are waxy, yet tough. They have
the cutting “feel” of brass, yet the tool-wear effect of
stainless steel. Nevertheless, any trained machinist can
readily shape Teflon® PTFE to tolerances of ±0.001 in
and, with special care, to ±0.0005 in.