I will be turning Delrin to make plugs to tubes. I was wondering if anybody out there had a recommendation of if coolant was needed. I was thinking it would not be necessary but a guy at my shop said delrin can were your inserts faster than some metals. Also, speed/feed recommendation would be appreciated. Thanks.
Black Delrin is very abrasive and will wear HSS very rapidly but carbide does last fairly well. Try to get micrograin carbide so you have the sharpest cutting edge possible. Delrin likes a nice sharp tool with little or no top rake, but avoid negative rake tooling. Speed and feed can be like brass or a bit slower than aluminum. Coolant is a good idea to keep things cool, Delrin will melt on the cutter at high speeds. For drilling use plenty of coolant, a new drill and peck frequently to get the chips out. For tapping watch out for chips wrapping around the tap and getting carried into the next hole, also new tap.
An open mind is a virtue...so long as all the common sense has not leaked out.
Once again Geof, I appreciate the quick answer.