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Tool Talk Discussion Forum

Heli-coil question..

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Carol Martin

06-08-2005 08:35:56




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I know we have some real smart cookies in this group: I would like to know how you guys drill out the holes for helicoils for instance I have three holes with worn 5/8 threads that I need to replace.. Now the hole is allready there at 5/8 and when I go to drill out with the drill for the heli-coil tap It tries to feed too fast and jams the drill. (I know go slow) but still likes to grab and tear things up.. anyone have a good solution to this problem..maybe fill the hole with something to hold it back,(wood plastic,fibreglass filler) lany suggestions would be greatly appreciated..I know this is a common problem. never found a good solution..

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Slowpoke

06-15-2005 11:22:43




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 Re: Heli-coil question.. in reply to Carol Martin, 06-08-2005 08:35:56  
Will this work for hand drilling? Before any drilling use an old lead tire weight and either melt it into the hole or mash it in tight with a hammer and some sort of punch, like a short rod or bolt. Otherwise, if the hole can be brought to the drill press, clamp it to the table and feed slow. Then it won't climb the bit. A good line up tool for portable drilling is a Portalign drill guide, but it's only for 3/8" drills.

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Arthur

06-09-2005 06:38:12




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 Re: Heli-coil question.. in reply to Carol Martin, 06-08-2005 08:35:56  
If it's already stripped out, your onlt taking out about .02-.04 out of the hole....Try to use a reamer instead....That will not grab



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Bus Driver

06-08-2005 18:11:49




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 Re: Heli-coil question.. in reply to Carol Martin, 06-08-2005 08:35:56  
I found that drilling through a drill bushing mounted on a steel plate helps keep the drill straight- which reduces grabbing. Regrinding the bit for shallow cutting angle is a legitimate practice.



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Carol Martin

06-09-2005 10:53:30




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 Re: Heli-coil question.. in reply to Bus Driver, 06-08-2005 18:11:49  
Hi. Ok I got the heli-coils in place now. I used bus-drivers suggestion and made up a plate with a guide bushing and that worked rather well. still had to go slow and carefull but much better that trying to do it without the guide.. Thanks everyone..

Carol..



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Bob

06-08-2005 16:51:34




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 Re: Heli-coil question.. in reply to Carol Martin, 06-08-2005 08:35:56  
If you've got an "eye" for grinding drill bits, simply regrind the bit with less than standard "rake", so it doesn't try to feed so fast, and grab.



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havvey

06-08-2005 15:29:07




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 Re: Heli-coil question.. in reply to Carol Martin, 06-08-2005 08:35:56  
is it possible to move up to 11/16 or 3/4 bolts end results no heli coil



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Randall Goldsmith

06-08-2005 14:58:53




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 Re: Heli-coil question.. in reply to Carol Martin, 06-08-2005 08:35:56  
I think your idea of putting something down the hole sounds better than any of the help you got so far, maybe some soft aluminum or copper, but you would hace to locate it so it would drill out along with your intended bit. I use Helicoils a lot, and this is a common problem, if you have a dedicated bit you could sharpen it differently so it had almost no bite thus slowing the cut and giving you more control, just don't make it so it builds up heat and hardens your hole! All the best, R

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big fred

06-08-2005 14:29:34




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 Re: Heli-coil question.. in reply to Carol Martin, 06-08-2005 08:35:56  
If you use cutting fluid, it will allow better control. Probably won't totally solve the problem, but should improve it.



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Bob - MI

06-08-2005 13:08:23




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 Re: Heli-coil question.. in reply to Carol Martin, 06-08-2005 08:35:56  
I used to run hand operated screw machines and we had a trick for drilling existing holes in brass that involved dulling the end of the drill so it wouldn"t cut too quickly and grab. The setup guy would take the new drills and go to the bench grinder and put a small flat out at the end of the flutes. Drove the cutter grinders nuts but we didn"t break near as many drills.

If you could find a reamer the right size that might do the trick too.

Best of luck

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wdtom

06-08-2005 17:45:40




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 Re: Heli-coil question.. in reply to Bob - MI, 06-08-2005 13:08:23  
Yes, for drilling brass, plastics, and materials that tend to grab as you discribe, you need to midify the drill point. the cutting edge where it slopes up,where the chip would go up the drill shank, grind this surface so it is in line with the drill length ways. In other words if the drill is standing up straight as in adrill press, the cutting edge instead of slanting back away from rotation should be verticle too. You don't need to grind it much to do the job, and if you grind much it will take more grinding to get it back to normal after the special job is done.

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Ron from IL

06-08-2005 10:18:04




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 Re: Heli-coil question.. in reply to Carol Martin, 06-08-2005 08:35:56  
Carol,

If you have a drill bit set, you could drill the hole out with some intermediate-sized bits, gradually working up to the size you want (say at a 64th or a 32nd at a time) so that it wouldn't grab so much. Just go SLOWLY.

Good Luck!

Ron



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lucasss

06-08-2005 09:35:05




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 Re: Heli-coil question.. in reply to Carol Martin, 06-08-2005 08:35:56  
i just use very light pressure on the drill . lucas



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