[Amps] drill bits

[Clint Talmadge]

To drill a 1/2" hole, start with a smaller size and work up in size.  The smaller drills will often have a much easier time with the harder material due to less heat build up.  As you step up the actual cutting area remains small, also reducing the heat.

Hope that helps,
Clint - W5CPT

  ----- Original Message ----- 
  From: carl s. 
  To: TARC at hamclub.org 
  Cc: amps at contesting.com ; mosi 
  Sent: Monday, October 30, 2006 3:37 PM
  Subject: [Amps] drill bits


         to all hams who may read this.!!
        Is there one among us who is a master machinist??
       I need someone who can tell me *exactly* what type of drill bit it 
  will take to drill thru a steel plate, 3/8 in. thick, Very hard (altho 
  hardness is hard to verify) A 1/2 in. Cobalt drill couldn't,touch it.!!! 
  So , how do I drill that plate ??
     I'll give you any more info I have ( which isn't much) 
      Please let me know if you have anything to help.!!!!
      carl / kz5ca
      Mosiarc.!!!!!!!

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