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Repairing damaged threads

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Slappy

04-06-2004 05:22:28




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Does anyone know if I can use a Heli-coil insert to restore threads that have been drilled and tapped to 1/4-NC back to a 10-24? If not a Heli-coil, any other suggestions? Thanks in advance.




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scotty

04-06-2004 06:52:48




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 Re: Repairing damaged threads in reply to Slappy, 04-06-2004 05:22:28  
Slappy, MEK has a good idea, but to bring it one step farther, take the 1/4 rod drill and tap the 10/24 thd on a lathe. When installing use some stud lock that you can buy at NAPA this will prevent the repaired piece from moving.

scotty



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Bob

04-06-2004 06:52:04




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 Re: Repairing damaged threads in reply to Slappy, 04-06-2004 05:22:28  
Go to:

mcmaster.com

And search for "threaded insert". The closest you'll find is 5/16" with a #10-24 internal thread. That leads me to believe there would not be enough difference in the 1/4" and #10-24 thread sizes to make a usable insert.

However, if you can enlarge your hole and tap it to 5/16"-18 TPI, you can buy inserts off-the-shelf.



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scotty

04-06-2004 06:55:20




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 Re: Re: Repairing damaged threads in reply to Bob, 04-06-2004 06:52:04  
Bob, Your right there wouldnt be much meat left if you drilled 1/4 and tapped out to 10/24. Sorry.

scotty



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MEK

04-06-2004 06:14:35




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 Re: Repairing damaged threads in reply to Slappy, 04-06-2004 05:22:28  
That's quite a jump. I don't know if they make a helicoil that will do that. Normally, they're some odd size that's only slightly larger than the original thread.

What you might be able to do is center-drill and tap out a short piece of 1/4" threaded rod (or cutoff bolt) for 10-24.



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Slappy

04-06-2004 06:26:20




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 Re: Re: Repairing damaged threads in reply to MEK, 04-06-2004 06:14:35  
Thanks for the great idea. It's an elegant solution, but I dont think I would have ever come up with it. I'm not bright, but I'm learning.



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