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!
put em up high and hope they stay up!
73, de bud
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