We are in a bind. We have a 1500 piece job that has to be delivered by
the end of next week and we have yet to get the job to run to the surface
finish we need. The part is about .750 inches long and formed up to .250 inches deep in
some places. The material is gummy and is welding to the edges of our
tooling. We have tried different rake angles with little luck and are
looking for a quick and economical solution.
Shop Doc Forum » Screw Machine Issues
Surface finish problem. Material gummy, welding to edges of tooling
(4 posts) (4 voices)-
Posted 1 year ago #
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What material are you running? I'm assuming you've tried various lubricants and cooling fluids?
Posted 1 year ago # -
I use an air grinder to angle the cutting edge so as to direct the chip away from the work. The finished chip curler is usually conical with the large end away from the work.
Careful attention to the cutting edge, as mentioned before, is critical. Use a fine stone to finish all edges, and hone by hand.
Oil coolant is recommended.
TomPosted 1 year ago # -
I would look at your coolant. If material is welding to your cutting tool, you are not removing enough heat. This is either from the lack of sufficient coolant or poor chip evacuation. Be sure the coolant is mixed to the right proportions and you have enough pressure delivering the coolant.
Posted 1 year ago #
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