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Thread inserts

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Mark from Genoa

04-24-2001 09:45:19




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I am currently working a 1957 Oliver Super 55
My problem is that the pin which pivots one of the three point arms is stripped out of the main transmission casting.

It is a 3/4-16 UNF tapped hole(or was). I was wondering if anyone has experience with the different types of thread inserts. I think the heli-coils appear to be better suited for low shock load applications. I have seen the key-locked tapped bushing which would require me to drill and tap a 1-1/8 - 12 unf hole. I am required to torque the pivot pin to 300 ft-lbs.So the insert would have to be self-locking to withstand the torque as well the normal shock loading applied though the three point arms. Just wondering if anyone has any experience with these items. Thanks Mark from Genoa, NY

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big fred

04-24-2001 17:27:50




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 Re: Thread inserts in reply to Mark from Genoa, 04-24-2001 09:45:19  
Mark, I've never used any inserts quite that large, but the principle is the same regardless. The heli-coil works great where you don't have sufficient edge margin to install a keen-sert (the key-locked insert) but as you noted, they will turn out on their own if not properly installed. In aerospace applications, our mechanics use a primer to install the helicoils which inhibits them from backing out. I'm familiar with the process, but not enough to give you a trade name for the primer, sorry. Perhaps a local machine shop could help out there. The self-locking feature isn't going to help with your torqueing requirement, any of the inserts should be able to handle at least as much torque (which equates to clamping force and therefore pullout force) as a tapped hole in the casting. I would just use a non-locking insert installed with primer and use a new split lockwasher when you bolt it up. If you have room for a keensert, it will work also, but they are a little more expensive.

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Ray,IN

04-24-2001 20:54:49




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 Re: Re: Thread inserts in reply to big fred, 04-24-2001 17:27:50  
Big Fred, you are right on to use heli-coil thread repair inserts. The Loc-tite brand of sealer works well, as long as you remember to use the cleaner prior to the sealer. Heli-coils come as a kit, with its own special tap and installation tool for the insert. They are expensive-proving you do get what you pay for. I have used many in the toolroom before I retired, and never had one come loose. Thats my experience anyway.

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Tom

04-25-2001 16:48:49




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 Re: Re: Re: Thread inserts in reply to Ray,IN, 04-24-2001 20:54:49  
I believe that the strength of Heli-coils exceeds the strength of the original thread. The Heli-coil is tough steel and the outside is larger than the original thread, therefore it is holding in more of the original material. A careful installation should make a good repair.



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Mark from Genoa

04-24-2001 14:55:14




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 Re: Thread inserts in reply to Mark from Genoa, 04-24-2001 09:45:19  
No unfortunatly the pin is the special pivot pin for the 3pt arm. so longer or larger is not an option.



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Big Jake

04-24-2001 09:58:08




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 Re: Thread inserts in reply to Mark from Genoa, 04-24-2001 09:45:19  
Can you just tap the existing stripped out hole
with a 7/8-16 tap & use a 7/8 bolt?? Do the existing threads go clear to bottom of hole(is this a blind hole)? If not maybe you can tap the 3/4-16 threads deeper & use a longer bolt.



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