Half Nut Repair Clausing 100

[ltlvt]

This is a repair of the Half Nut on my Clausing 100 lathe. I also made a new cast iron cross slide nut from cast iron as well. I finally got around to sawing the nut in half today and re assembling the apron to the Saddle and putting the lead screw back in it. To my great surprise and being tickled pink all works just as it should with new parts. I have pictures scattered everywhere including thumb drives -phone-tablet etc. So, bear with me if the pictures are not in order. I may even come back later and add more pictures as I find them. There is very little on these old lathes, so my intent is to post my success here to help others. Thanks for stopping by my thread.

 

[ltlvt]

kHere is some more pictures. Sorry they are not in order

 

[DavidR8]

Thanks for this.
I'm looking at picking up a Clausing 100 Mk3 and one of the things that concerns me is the condition of the half nuts. I saw a video where a fellow made an Acme threaded insert from brass then bored out the half nuts to accept the insert and then epoxied in the brass insert.
Having never seen the half nuts on a Clausing I have no idea if this would be possible.
It looks like you milled/turned off the old threaded portion and then brazed on a new piece to be Acme threaded?

 

[ltlvt]

Thanks for this.
I'm looking at picking up a Clausing 100 Mk3 and one of the things that concerns me is the condition of the half nuts. I saw a video where a fellow made an Acme threaded insert from brass then bored out the half nuts to accept the insert and then epoxied in the brass insert.
Having never seen the half nuts on a Clausing I have no idea if this would be possible.
It looks like you milled/turned off the old threaded portion and then brazed on a new piece to be Acme threaded?

I am pretty sure I saw the same video where the guy JB-Welded the bronze insert in the existing half nut. I originally gave his idea some serious thought, but the Half-nut and Lead screw are under some serious pressure when turning. The original half nut was cast-iron, so I decided to go all the way with cast-iron. I have not looked at these pictures in a while, but I used a modified aluminum 3/4" rod to make a long center punch to align the center of the lead screw with the apron and cast-iron blank Half Nut. Works like a charm. I did the same thing with the Cross Slide lead screw NUT. Almost no back lash.