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Tool Talk Discussion Forum

Bi-Metal Hole Saw

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BobInMN

11-26-2003 18:25:48




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Has anyone ever used one of these? I have a project I want to build and it will require me to drill several 2" holes in 1/4"X3"X3" square tubing. I was just wondering if they work well or if I will end up buying one for every hole I want to cut.




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wolfe in tx

11-28-2003 17:20:49




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 Re: Bi-Metal Hole Saw in reply to BobInMN, 11-26-2003 18:25:48  
Hole saw aren"t cheap. Check with your local machine shop see what they would charge you. Mite be cheaper than hole saws and faster. Just a thought. Good luck



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john d

11-27-2003 07:07:31




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 Re: Bi-Metal Hole Saw in reply to BobInMN, 11-26-2003 18:25:48  
Good advice in the previous posts! Only thing I'd add is to clamp your material so solidly that it CAN'T POSSIBLY move while you're using that saw!



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Paul Janke

11-27-2003 06:23:00




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 Re: Bi-Metal Hole Saw in reply to BobInMN, 11-26-2003 18:25:48  
It can help to drill a couple of holes across from each other on the cut line of the saw so the chips can fall out. When you cut deeper than the teeth are, it is hard for the saw to get rid of the cuttings. I use about 1/4" holes with the outside of the holes even with the outside of the cut.



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Fred OH

11-27-2003 04:40:43




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 Re: Bi-Metal Hole Saw in reply to BobInMN, 11-26-2003 18:25:48  
And...use a drill press and blow out the shavings frequently as they are what binds it up and yanks the teeth off. Like he said...use plenty of cutting oil or 20 wt non-detergent motor oil will work in a pinch. Some of the larger hole saws have two holes next to the screw on arbor (so does the arbor) and they are for dowels to help drive it. The drilling of the larger holes will sometimes strip the threads from the arbor without the dowels to help take the load off the threads. I have drilled 4" holes in 1/2" plate steel using the above rules and did lose a couple of teeth but succeeded.
Stay slow...pi x dia x rpm over 12 = cutting speed so, don't go over 200 rpm. Fred OH

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jailkeeper

11-26-2003 19:05:33




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 Re: Bi-Metal Hole Saw in reply to BobInMN, 11-26-2003 18:25:48  
Hole saws work good on steel as long as you keep the drill speed slow and use plenty of oil.



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