I made an internal action wrench today. I had intended to cut a square 1/2 inch hole and use a 1/2 inch pull handle to twist the action off. Well I screwed that up. So I drilled out the end of the wrench and threaded if for a 7/8 bolt. Then I JB welded the bolt into the wrench. How mech adhesion is JBs gonna get. Is that bolt gonna just spin outta there when I apply pressure. this thing will probably only be used once or twice.
Gunsmithing JB weld strength on bolt threads?
- Thread starter eddybo
- Start date
Re: JB weld strength on bolt threads?
Shear capability of the JB Weld is around 12.5ksi
Calculate the surface area of the inside of the bolt hole.
Calculate the shear failure at 12.5ksi on that area and see how much load that is
Calculate the moment resolution at that bolt necessary to create say, 200 ft-lbs
Compare the two values, if the shear value is higher than the load share on the bolt then you're good.
Seems like a lot of work for a very rough approach...
Or, you can just try it. If/When it breaks, drill the epoxy out, buy a bigger tap, some new bolts and don't screw up the job.
Shear capability of the JB Weld is around 12.5ksi
Calculate the surface area of the inside of the bolt hole.
Calculate the shear failure at 12.5ksi on that area and see how much load that is
Calculate the moment resolution at that bolt necessary to create say, 200 ft-lbs
Compare the two values, if the shear value is higher than the load share on the bolt then you're good.
Seems like a lot of work for a very rough approach...
Or, you can just try it. If/When it breaks, drill the epoxy out, buy a bigger tap, some new bolts and don't screw up the job.
Re: JB weld strength on bolt threads?
You can JB it, then drill and pin through the bolt and wrench for added peace of mind....
You can JB it, then drill and pin through the bolt and wrench for added peace of mind....
Re: JB weld strength on bolt threads?
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bohem</div><div class="ubbcode-body">Shear capability of the JB Weld is around 12.5ksi
Calculate the surface area of the inside of the bolt hole.
Calculate the shear failure at 12.5ksi on that area and see how much load that is
Calculate the moment resolution at that bolt necessary to create say, 200 ft-lbs
Compare the two values, if the shear value is higher than the load share on the bolt then you're good.
Seems like a lot of work for a very rough approach...
Or, you can just try it. If/When it breaks, drill the epoxy out, buy a bigger tap, some new bolts and don't screw up the job.
</div></div>
Finally, a point of view where I differ, however slightly, from bohem.
I don't trust epoxy in shear. I have seen too many epoxied on sights pop off with tiny amounts of recoil.
I assume 20kpsi failure in compression and use screws to take up the tension and shear.
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bohem</div><div class="ubbcode-body">Shear capability of the JB Weld is around 12.5ksi
Calculate the surface area of the inside of the bolt hole.
Calculate the shear failure at 12.5ksi on that area and see how much load that is
Calculate the moment resolution at that bolt necessary to create say, 200 ft-lbs
Compare the two values, if the shear value is higher than the load share on the bolt then you're good.
Seems like a lot of work for a very rough approach...
Or, you can just try it. If/When it breaks, drill the epoxy out, buy a bigger tap, some new bolts and don't screw up the job.
</div></div>
Finally, a point of view where I differ, however slightly, from bohem.
I don't trust epoxy in shear. I have seen too many epoxied on sights pop off with tiny amounts of recoil.
I assume 20kpsi failure in compression and use screws to take up the tension and shear.
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