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Drill press, big holes, I'm glad I did!

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Bill Oakes NY

02-27-2003 05:28:04




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I had asked for advice a while ago about drilling larger holes with my old drill press that turned too fast. I bought a Grizzly, 3/4 HP unit with a low speed of 140 rpm. Just put it together last night. The castings are a little rough but all machined surfaces seem to be done well enough. I drilled a 7/8 inch hole in a piece of 1/2 inch plate as a first test. It was REAL nice; no chatter, cutting fluid stayed right where I put it. I will no longer cringe at the thought of drilling larger holes. Just thought you would appreciate the followup.

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Scott Green

03-01-2003 05:45:06




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 Re: Drill press, big holes, I'm glad I did! in reply to Bill Oakes NY, 02-27-2003 05:28:04  
Hi Bill , nothing to do with drilling at home , useing the drill press. What I stood and watched what was amazing to me. I thought I would pass it on. I was watching a machine drill 4" holes through steel which was at least three inches thick. Didn't even use a pilot drill.



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Bud in NC

02-27-2003 15:53:23




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 Re: Drill press, big holes, I'm glad I did! in reply to Bill Oakes NY, 02-27-2003 05:28:04  
Trick to try - next time you have to drill a large hole, drill about a 1/4" or 3/8" pilot hole, change to the large bit for the finish size hole (or middle step) and then tear a strip of emery cloth a little wider than the large bit's diameter and about 3 times the length of the bit diameter. Fold it over to make a "pad" with 3 thicknesses of emery cloth. Center it over the pilot hole and drill through it. It acts to reduce the rake angle and prevent the bit from trying to self-feed and acts like a "shock absorber" - eliminates the chatter. Use oil like normal.

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Jet9N

02-27-2003 16:52:40




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 Re: Re: Drill press, big holes, I'm glad I did! in reply to Bud in NC, 02-27-2003 15:53:23  
I usually use a pilot hole 1/2 the diameter of
the next drill size. For 1" hole, start with 1/4,
then 1/2, then finish with 1".

MHO

Jet



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