Hello, I`ve not spent much time tread cutting on this lathe as I tend to use my mini-lathe to do most of it. I did give it a go, I think 28TPI or something like, right when I got the lathe. Not much of a problem once I had figured it all out, worked very well.
Anyway, I tried to cut 8TPI for my current project and since the mini lathe only goes down to 12TPI I needed to use the Boxford. the project is for a Rotary table adapter to fit my boxford chuck - I needed 8TPI 1 1/2" whitworth.
I set it all up and as the stub is only a short distance I made a massive mistake, I took it too quickly and hit the end. It didn`t sound like a massive calamity, I managed to stop it almost immediately but when I took it back to take my next cut found that the gearing for the lead screw were not meshing. No, problem, I`ve obviously strained them with colliding and also on such a low thread. I unbolted the adjustable gear which can move up and down on the slot to allow correct alignment but I just can not get into a position where both mesh! I can have it meshing with the top and bottom but not together!!!

I`ve been looking at it for the last hour or so and really can`t see what else I can do. The top gear seems to be locked in position on the gear engage and forward/reverse select lever and the bottom gear is fixed in alignment with the lead screw so neither of these can be adjusted.
Any ideas or advice. I guess I must have done something else than force this gear out of position but I can`t work out what!
Any advice appreciated.