[Shop-talk] step drilling holes
eric at megageek.com
eric at megageek.com
Fri Aug 12 03:43:26 MDT 2016
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 at autox.team.net> wrote: -----To: "shop-talk" <shop-talk at 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 1/2” plate. Using a
drill press so that helps... I wouldn’t try a 1” hole with a hand drill ! Didn’t
really think a hole saw was the right way so I just stepped up starting with a
3/8” bit then up to 3/4. then up to 1”... 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 ?? 1/4” increments ?? 1/8”
?? job is done but I was never taught this I just
kinda used what I thought would work. Suggestions ??
thanks
John
More information about the Shop-talk
mailing list