Sent from my Commodore 64 on a 2400 Baud Modem.
Eric P
"Be as beneficent as the sun or the sea, but if your rights as a rational being
are trenched on, die on the first inch of your territory." Ralph Waldo Emerson
-----"Shop-talk" <shop-talk-bounces@autox.team.net> wrote: -----To: "shop-talk"
<shop-talk@autox.team.net>
From: "john niolon"
Sent by: "Shop-talk"
Date: 08/11/2016 23:07
Subject: [Shop-talk] step drilling holes
One trick I learned was to start with a spotting center drill. Something like
these...
https://www.amazon.com/Atoplee-Industrial-Premium-Combined-Countersink/dp/B00M3TEF4I/ref=sr_1_2?ie=UTF8&qid=1470994860&sr=8-2&keywords=spotting+center++drill
Once that small center hole is in the metal, normal drill bits work much better.
Also, there are hole saws for metal that are great to use for 1" + hole sizes
to prevent having to drill the same hole 3 times with increasing sizes.
John asks...
had to drill some one inch holes (several) in 1/2â?? plate. Using a
drill press so that helps... I wouldnâ??t try a 1â?? hole with a hand drill !
Didnâ??t
really think a hole saw was the right way so I just stepped up starting with a
3/8â?? bit then up to 3/4. then up to 1â??... Worked fine.. lots of oil, took
my
time... but while I was bored (pardon the pun) I was thinking about the best
steps to use...  when drilling large diameter in thick steel is there
an accepted increment you should use ?? 1/4â?? increments ?? 1/8â??
??     job is done but I was never taught this I just
kinda used what I thought would work.  Suggestions ??
Â
thanks
John
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