Max,you are not going to hurt your spindle machining Delrin(acetal). Delrin was made to machine. Treat it like aluminum,rev the spindle up and GO! It's not going to melt like soft plastic. You don't even have to run coolant on it while turning or milling. I have 20 yrs experience cutting the stuff. The black Delrin puts off formaldehyde fumes that will irritate your eyes,nose,etc..Ugh!
Dan |