Posted by Eric in IL on December 30, 2009 at 06:51:02 from (66.116.6.243):
In Reply to: Re: Drill Bits posted by Paul from MI on December 30, 2009 at 04:41:01:
My experience with step drilling is to drill only twice. The first hole is the size of the web on the final drill bit.
I realize this depends on the equipment available. If you are only using a small electric hand drill this may not be possible, depends on how strong you are/how hard is the material. If power feed is available I only drill one pilot hole. Drilling the pilot hole bigger than the web of the final drill makes the final drill chatter. Chatter is a sharp drill killer.
Paul, not trying to dispute your post, just adding my experiences.
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