[Boatanchors] Help on drilling out knob setscrew

[BOB]

If you can get a carbide drill of the right dia. and run it fast enough it will drill any hardened steel. You might have to find a machine tool supplier. If the screw is really hardened tool steel although it would be unusual, an easyout won't be able to bite into it and you won't be able to peel the remaining threads clean with a tap as it will just break the tap. You would have to drill and tap another hole.

Bob W1GTH
  ----- Original Message ----- 
  From: LeeCraner at aol.com 
  To: boatanchors at mailman.qth.net 
  Sent: Thursday, January 22, 2009 8:54 PM
  Subject: [Boatanchors] Help on drilling out knob setscrew


  I've got an aluminum knob on an old rcvr with a completely rounded out allen head setscrew.  I've attempted to drill out the set screw using high speed steel, colbalt and tungsten drill bits, all to no avail.  Seems this setscrew is harded steel, harder than any drill bit I can find.

  Any ideas on drilling this out, guys?  

  Thanks in advance.

  73
  Lee WB6SSW



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