JB weld for cast iron repair

if you apply any glue to the bolt, make sure you have a hole somewhere to let the glue out and air out. you don't want a hyrdaulic seal preventing you from tighening it. You can even drill a hole in the bolt to let the shmooo out.:)
 
You may want to look at this product too, Low temp weld - says it creates a joint stronger then the original cast iron.

Castaloy
 
Devcon is great stuff. Loctite also makes great products. In a past life we used Loctite to hold carbide "teeth" on a crusher that applied over 6 million pounds of cyclic force. That being said all these products are designed for certain situations. some require a gap, some don't. Some thrive under pre-load, some don't. They will all make you do a lot of swearing if you need to remove them because you need to braze or solder the joint.

A question to ask first though, is why is the foot broken? If it got wacked or something happened that's one thing, but if there is a vibration or mounting issue you're going to continue having issues.
 
Well, I think I know the answer already, but looking for the voice of experience on this one.

Iam trying to reattach a 1" x 1" x 2" cast iron foot to the body of an old, very large electric motor body casting off my Van Norman 12 horizontal mill. This little piece holds one of four 3/8" motor mounting bolts, that secure the motor to the top of the machine. Alas, This little foot broke off the base of the motor body when the mill tipped over during a move.

I have drilled and tapped two holes to bolt the piece back onto the body. Using 1/4x 20 bolts, the piece seems to attach strong and stable. Yet, I would like to have a permanent bond along the fracture for added strength. (The motor mounting bolts apply shearing force to the bolted together part when then are torqued down.)

I don't want to braze this part back onto the casting as I don't want to risk damaging or melting the copper wiring and old insulation affixed inside the motor. So thinking about using JB weld to glue the edges together, and then hold with the two set screws into the holes I made.

Wondering if using JB weld is a wasted effort? (It only has 1000# shear strength)

Anybody have a similar experience?

Thanks
Glenn B.

Devcon is great stuff. Loctite also makes great products. In a past life we used Loctite to hold carbide "teeth" on a crusher that applied over 6 million pounds of cyclic force. That being said all these products are designed for certain situations. some require a gap, some don't. Some thrive under pre-load, some don't. They will all make you do a lot of swearing if you need to remove them because you need to braze or solder the joint.

A question to ask first though, is why is the foot broken? If it got wacked or something happened that's one thing, but if there is a vibration or mounting issue you're going to continue having issues.

It was a moving issue.
 
We used JB Weld to fabricate a new carburetor flange on the head of a welders gas motor when it broke off as a result of falling off a truck. Welder saw rough field work at the ski area for several years before we replaced the welder. Carb stayed bolted to the JB Weld flanges (with heli-coil threads) and the flanges never cracked.
If you would have bet me on this before hand you could have won a lot of money!
 
Generally agree with all of the above. I have never used JB weld, but I've heard a lot of good things about it. I have had great success with Devcon, I've even repaired a large flame gouge in the mating face of cylinder liner and head on a large marine diesel engine. was quite succesful. I would think any good quality epoxy would work, especially if you apply the adhesive and then bolt it up tight, the bolts will be a bit like putting reo rods in concrete, Depending on the contact area available you may have room to drill some small holes to act as an extra key. Also follow the rules good prep, and very clean surfaces. Should be a great success.
 
Went out looking for Devcon today. Of course none to be found. Any chain stores on the west coast known to stock it?
 
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