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Old 02 April 2010, 02:49   #11
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Use a center punch and start with a smaller drill bit for the first hole
then use a larger drill bit to finish.
and as everyone else has said keep the rpms low .
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Old 02 April 2010, 03:24   #12
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I agree with everything said, but took some advice from a fabricator who said dont try to drill the hole in one go, drill a bit then let the drill bit and material cool, before drilling some more, I found this worked quite well, and drills tend to last a bit longer.
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Old 02 April 2010, 05:46   #13
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Nice and slow with plenty of lube
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Old 02 April 2010, 06:37   #14
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And if yerv got the skill, resharpen the drill to around 80, it'll transform its cutting ability. If you're using a powerful hand drill, take care as the drill penetrates because it is likely to spiral in and wrench you wrists. The technique is to hold off the pressure for the last part of the cut.
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Old 02 April 2010, 07:33   #15
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If your drilling above the tubes cover them too
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Old 02 April 2010, 11:26   #16
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I prefer to use cutting oil as a lubricant for metal work. A can (or bottle) runs about $6, and lasts quite a while. The difference in cut/drill quality is reasonably notable. Stuff is usually sold as "thread cutting oil", "cutting fluid", or somesuch. I use it on drill bits, hacksaws, pretty much any kind of metal cutting. A locksmith once told me its one of the better products for lubricating a sticking front door lock (though I have no idea why.)

jky
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Old 02 April 2010, 13:04   #17
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a local engineering firm that uses loads of stainless steel in the manifacture of mortury equipment,recons that for drilling in plate stainless a few drops diesel fuel will make it drill as good as some of the cutting oils ,it he who says its sometimes easier to punch a hole through if its thin enough .
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Old 02 April 2010, 20:56   #18
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I had no idea hole drilling answers would get beyond one page, thanks for all the advice, particularly the centre punch idea as I'd anticipated a slippery start to drilling and was contemplating using some adhesive tap over the drill area until I saw this idea. Drilling tomorrow, I feel prepared and confident !
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Old 03 April 2010, 03:11   #19
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Quote:
Originally Posted by jyasaki View Post
I prefer to use cutting oil as a lubricant for metal work. A can (or bottle) runs about $6, and lasts quite a while. The difference in cut/drill quality is reasonably notable. Stuff is usually sold as "thread cutting oil", "cutting fluid", or somesuch. I use it on drill bits, hacksaws, pretty much any kind of metal cutting. A locksmith once told me its one of the better products for lubricating a sticking front door lock (though I have no idea why.)

jky
Yep but then you have to clean it up, if it's just a couple of holes on an aframe mounted on the rib, water is far easier and minimum mess

Jim
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Old 03 April 2010, 03:26   #20
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Quote:
Originally Posted by cgf10 View Post
I had no idea hole drilling answers would get beyond one page,
But this is Ribnet We can spin out some total mince for ages and ofcourse hole drilling is a specialist subject ... 2 pages and some usual contributors havent even warmed up yet ?
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