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@hamclub.org
Cc: amps@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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