[Boatanchors] Help on drilling out knob setscrew

[Lloyd KK7IZ]

Harbor Freight sells some kits/sets of small diamond drills and burrs that are excellent for removing hard screws etc.
Thanx
Lloyd  KK7IZ
kk7iz at cox.net


  ----- Original Message ----- 
  From: Bob Hardie- W5UQ 
  To: W9RAN at oneradio.net 
  Cc: boatanchors 
  Sent: Friday, January 23, 2009 4:31 AM
  Subject: Re: [Boatanchors] Help on drilling out knob setscrew


  you know, that's a very good question... if it's harden steel, then how did it round out?  
  A GOOD drill bit is needed... it will let go after drilling and some of the set screw threads WILL be left inside.  After knob removal, a "tap" the right size will remove the threads.  
  Me thinks your drill bits were a bit dull....  :-)     Even good ones can become a bit dull and you need brand new ones...  left handed drill bits will work too if your drill is reversible.  
  Gud Luk and gud nite...
  Bob 

  Robert Nickels wrote: 
BOB wrote:
  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.

    That was going to be my suggestion as well.  I had to drill out two 
setscrews each on about a dozen knobs on a Hallicrafters HT-20 that 
suffered corrosion, not a single one would budge!

Have to admit I'm puzzled as to how the hex head got rounded out if the 
screw is made of such tough hardened steel.   But I'm sure you can drill 
it out with a carbide bit.

73, Bob W9RAN
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