Cast leadscrew nuts vs. machined

[KBeitz]

I've done a lot of real castings using Babbitt. One day I needed a acme nut for
a pin router. I know that your to smoke the truning part so what your casting wont
stick to that part but I wanted to try something all new. I cast the nut using JB-weld.
I greased the acme rod instead of smoke. The casting worked great after I got it
loose from the rod but hey... Who would have thought that JB-weld sticks to grease.
Wow did I have a time getting the nut to turn at first... So far its working great. I have
been using it for around a year now.

 

[Eddyde]

+1 on the JB Weld. I used it to successfully repair a gear casing on a Bosch Brute demolition hammer. The pocket that holds a sleeve bearing, receiving the main gear shaft, had worn out and became so enlarged the gears would no longer mesh. I cleaned out the pocket well and coated it with JB weld, inserted the bearing and put the gears in position to set the bering correctly. I only hoped it would make it through the next job but that was 10 years and a couple of dozen jobs ago...

 

[KBeitz]

I'm now repairing something like that using LOCTITE 660 Retaining Compound .

 

[BaronJ]

Thanks for the reply, When it warms up out in the shop will do a test nut and see how that goes. Thanks again!

That was exactly how I made the precision nut for my hight gauge.
I just turned it down for a press fit. The silicon grease helped to reduce the tightness when unscrewing it from the rod threads.


If you look carefully you can see the joint.


That bit underneath is the top of the frame.