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Tool Talk Discussion Forum

Tricky weld

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Errin OH

07-17-2004 17:56:14




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I have a need to make some adjustable brackets. The plan is to have a 3/4" bolt with a T handle welded to it. I see three options.
1) Weld a regular nut and use a jam nut. Requires tools to make adjustment and I want to avoid that.
2) Find a lock type nut (crimped on top)that I can weld in. Concern is that it will be to impossible to adjust with out tools and over time may cause thread damage.
3) Nylon lock nut. Problem is how to weld it in with out distroying the nylon. My thought was to drill a large enough hole to allow the nut Non nylon side) to come through the bracket. Clamp the work together, place the nut (nylon side) in water, with the bracket just above the water and weld the edges (tack three spots) of the nut. Anyone ever try something like this? Weld on a nylon nut with sucess.

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mac

07-23-2004 22:49:04




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 Re: Tricky weld in reply to Errin OH, 07-17-2004 17:56:14  
How about a castlelated type locknut?



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TimFL

07-20-2004 21:59:07




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 Re: Tricky weld in reply to Errin OH, 07-17-2004 17:56:14  
Not sure exactly what you are try to do but this has worked for me. On your T handle, add a second cross piece so that basicly have four handles with 90 degrees of separation. Then fashion a locking devise that will interface with the handles. If fashioned properly it would give you a locking point every 45 degrees, locking on the handle and between the handles. Again not sure of your application but 45 degrees of turn on a threaded nut can be pretty fine adjustment. Good luck.

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leland

07-19-2004 23:14:37




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 Re: Tricky weld in reply to Errin OH, 07-17-2004 17:56:14  
How about drilling a small hole in end of bolt and use a kotter or hitch pin it may get loose but you won't lose it



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Fred OH

07-19-2004 08:16:29




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 Re: Tricky weld in reply to Errin OH, 07-17-2004 17:56:14  
Looks to me like theres enough methods here that you can sort out one of them to work...but if you're afraid you'll lose the tee bolt part after it is assembled, take a hammer and center/prick punch and stake the first thread so that it won't come all the way apart. At least you won't lose it. On a (regular)nut that size...you could drill and tap a quarter or five sixteenth threaded hole in the side of it and insert a piece of brass or bronze with a set screw behind it and run a tap thru it again to thread the brass or bronze piece so it can be tightened down against the bolt threads to secure it. Do your welding on a piece of chain and an allen wrench...welded to the bracket. Fred OH

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Vern-MI

07-19-2004 04:44:51




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 Re: Tricky weld in reply to Errin OH, 07-17-2004 17:56:14  
Take a regular nut and saw cut a slot in the nut about 1/3 of the way through and perpendicular to the axis. Pinch this saw cut section together slightly so as to change the thread spacing at the saw cut area. After welding when the male thread is inserted into the nut the saw cut will spring back to the original thread spacing and keep tension and consequent prevailing torque on the thread.



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T_Bone

07-18-2004 19:26:35




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 Re: Tricky weld in reply to Errin OH, 07-17-2004 17:56:14  
Hi Errin,

You can two point tack weld the nut but you have to be fast plus cool it with water right away. Then I too have had to cut off several nuts before I got one correct.

Expensive 3/4" ny-locs I would look at a different way.

Would a double jam nut work with your "T" handle idea? Or a double jam nut with a multi tooth lock washer.

I too have used the squeezed nut or chisel cut part of the threads but both will quickly need more locking power after using a few times.

T_Bone

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buck

07-18-2004 19:08:26




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 Re: Tricky weld in reply to Errin OH, 07-17-2004 17:56:14  

Instead of farbicating the solid T handle, make the handle like a vice handle. Just weld a short piece of pipe/tubing to the bolt head to acomodate the size of handle you want. Add something to the handle ends for a little weight and to keep it in place. I have found that non threaded round rod with a chain link welded to each end works real good.



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RWK in WI

07-18-2004 18:18:50




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 Re: Tricky weld in reply to Errin OH, 07-17-2004 17:56:14  
How about drilling a hole smaller than the nut and the fileing it out to the size and shape of the nut for a force fit. You might not even have to weld it.



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bill b va

07-18-2004 10:17:23




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 Re: Tricky weld in reply to Errin OH, 07-17-2004 17:56:14  
i should have posted this here instead of below..... ..... ..... ..... ..... ..... a self locking nut can be easily made from a plain nut by slightly flating it to cause a interfirence fit . wrenches and sockets will still work . i have made small one by hitting with a hammer . larger ones could be made by squeasing in a hyd. press . test first you might like it .



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Vern-MI

07-18-2004 06:50:54




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 Re: Tricky weld in reply to Errin OH, 07-17-2004 17:56:14  
Instead of trying to weld without damaging the nylok insert why not use a product which can be brushed on to both the nut and the thread. This will provide the prevailing torque characteristic which you trying to achieve. The product can be applied to both the nut and the threaded fastener to also provide corrosion resistance in addition to the prevailing torque feature. It can be renewed if desired to restore the prevailing torque aspect.

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Scott Green

07-18-2004 06:43:08




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 Re: Tricky weld in reply to Errin OH, 07-17-2004 17:56:14  
Another option! Weld the nut on as you mentioned. Install a good rugged spring between the nut and "T" handle.



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JT

07-17-2004 21:11:17




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 Re: Tricky weld in reply to Errin OH, 07-17-2004 17:56:14  
Don't know quite what your application requires but would this work?

Weld a regular nut where you need it. Make your T handle bolt as described. Weld a piece of rod or whatever to a jam nut. This would give you the jam nut you need without the tools for adjustments.

JM2CW
JT



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Jim in Va

07-17-2004 20:35:59




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 Re: Tricky weld in reply to Errin OH, 07-17-2004 17:56:14  
Nylon nuts are intended for one time use.



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MarkB

07-17-2004 20:00:31




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 Re: Tricky weld in reply to Errin OH, 07-17-2004 17:56:14  
It sounds like what you want to do is to weld a captive nut to something, and you're concerned that the bolt that goes through the nut will shake loose. So you want to use a self-locking nut instead of a plain nut.

There is such a thing as an all-metal self locking nut. Exhaust manifold nuts are frequently made this way. However, you're going to have a hard time finding an all-metal self-locking 3/4" nut.

I think even if you use a self-locking nut, you won't be happy with it. It's really agravating to use a self-locker for something you're constantly adjusting. The problem is that it's hard to tell if your bolt is tight or not when it's in a self-locker. I think you'll be happier going with a jam nut. You should be able to weld a handle directly to a 3/4" nut with no problem.

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bill b va

07-18-2004 00:15:22




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 Re: Re: Tricky weld in reply to MarkB, 07-17-2004 20:00:31  

a self locking nut can be easily made from a plain nut by slightly flating it to cause a interfirence fit . wrenches and sockets will still work . i have made small one by hitting with a hammer . larger one could be made by squeasing in a hyd. press . test first you might like it .



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lee

07-17-2004 19:40:33




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 Re: Tricky weld in reply to Errin OH, 07-17-2004 17:56:14  
very tricky to weld that nylon nut without damage
even if it worked how long would it last and it would be time consuming to adjust if many turns are required of the T handle, buy a cheap wrench to keep with the brackets so you can loosen the jam nut and or bolt. weld a box wrench to the jam nut and cut the wrench off short so to make it like half a wing nut. Maybe you have space limitations. It's not really clear what you are trying to accomplish.

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Hermit

07-17-2004 19:11:45




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 Re: Tricky weld in reply to Errin OH, 07-17-2004 17:56:14  
Can you use epoxy instead of welding?



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