On 30 Jun 97, Bud <email@example.com> 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: firstname.lastname@example.org
Newtown, PA FRC alternate: email@example.com
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