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[TowerTalk] drilling chromoly es similar pipe

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Subject: [TowerTalk] drilling chromoly es similar pipe
From: (Barry Kutner)
Date: Mon, 30 Jun 1997 11:00:04 +0000
On 30 Jun 97, Bud <> wrote:

> i am doing some antenna repair and part of the repair requires drilling
> heavy mast.  by heavy i mean 1/2" wall thickness chromoly steel.  after
> burning up several bits and a few $$$ let me pass this tip:  use a 
> masonry bit ( carbide tip ), lowest speed on drill press, and lot of
> oil.  the most expensive bit i have used only did about 1/8 inch deep
> ( cost about $12 ) and the least expensive was the carbide tip masonry
> type.  it has taken me over 4 hours of drilling to make a 5/8 hole in
> some of this stuff but i am betting it wont bend!
I've used a "Cobalt Heavy duty drill bit." It's labelled "for tough 
steel and stainless steel." Went thru the mast easy, after killing a 
few regular bits...

Barry Kutner, W2UP              Internet:
Newtown, PA         FRC         alternate:

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