Posted by Butch(OH) on November 11, 2013 at 17:54:45 from (74.135.32.232):
In Reply to: set screw removal posted by jim_uny on November 11, 2013 at 15:02:46:
If they will still hold a wrench heat red and try again. If they wont hold a wrench everyone has their favored tricks. I prefer methods that don't make the problem worse if they don't work. Welding, easy outs, heating and then quenching all have that distinct possibility. A Cobalt drill that is to tap size for the screw thread is what I would use. Do not step drill. You need good bits with the correct percentage of Cobalt not cheapo junk that claims to be Cobalt so go to McMaster -Carr or Grainger web site, or a machine tool supply if you have one near and get a couple extras, Cobalt bits are brittle. The set screws are hard but not super hard and the trick to drilling with Cobalt bits is to run the drill slow, use plenty of any kind of oil but cutting oil is best and take it easy pushing until you have the bit past the broaching for the wrench and then push hard enough so the bit is pulling a good chip, this is what cools the bit and keeps it cutting, zing the drill wide open just once with no pressure and you will know why I said get extra bits. It is easy to tell when you break through the screw.
This post was edited by Butch(OH) at 05:58:47 11/12/13.
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