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08-29-2012, 07:54 PM
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Join Date: Aug 2012
Posts: 2
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drill bits
where do you guys buy your drill bits for pins and thong tubes? On-line? Shoot me an email at tud51427@temple.edu. Also, how much oversized should I drill ? 2 0r 3 thousands of an inch?
THanks for your help
Last edited by Red Shed Knives; 08-29-2012 at 07:55 PM.
Reason: left something out
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08-29-2012, 08:42 PM
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Founding Member / Moderator
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Join Date: Jun 2002
Location: Wauconda, WA
Posts: 9,840
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Yes, 2 or 3 thou should do it, depending on what you're drilling through - some handle materials tend to close up and might need a larger hole. Any machinist supply has drills in any size by thousandths. If you don't already have a drill chart be sure to get one when you order the drills - every question you might have about drill sizes is on these charts and the charts are very cheap, sometimes even free. Check MSC, Enco, or McMaster-Carr for the drills. For knife related work, I prefer cobalt drills (not carbide - cobalt) in screw machine length...
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08-29-2012, 11:25 PM
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Hall of Famer
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Join Date: Sep 2006
Location: Decatur, IL
Posts: 2,612
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I used to get drill bits just a little over sized, like 6.4mm for 1/4" pin stock. Now I just drill the hole with the same size drill bit and then use a carbide burr on my Dremel to ream the hole just a little larger. I can get tighter fits that way but I have to grind a little and check a lot to keep from over enlarging the holes.
Doug
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08-30-2012, 08:28 AM
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Super Moderator
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Join Date: Jun 2002
Location: Great Falls, Montana, USA
Posts: 4,393
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Here's a little chart that I made up and have hanging near the drill presses and the mill in my shops:
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09-02-2012, 12:11 PM
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Founding Member / Moderator
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Join Date: Jun 2002
Location: Wauconda, WA
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I don't worry much about rpm on my drill press or my mill. The rpm spec is useful in manufacturing environments to maximize the life of the drills and cutters and the speed of manufacturing but as long as the drill or cutter is sharp it will work fine at slower speeds which are generally safer for us. My drill press runs at 250 rpms all the time without regard to the type of material being drilled or the size of the drill. You just adjust yourself so that you don't feed the drill any faster than it can cut and you're good to go, more controllable, and less likely to damage anything (including you) if the drill breaks (which it won't if you use sharp drills and don't try to push it too fast) ...
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