I recently got hold of an old union graduate lathe for a pretty good price. Here in NZ I couldn't find anything to fit the 6TPI thread. I didn't like the idea of an adapter so I knocked the spindle out and took it down to a friends shop and got him to machine a new thread so that one of the nova inserts would screw onto it.
I don't know what's gone wrong but I seem to have a bit of runout after getting it back together. I've attached a video showing a ~3mm flathead screwdriver up next to the spindle shoulder, no dial indicator sorry. The flange and the taper (MT3 to MT2 sleeve) are both still running true but the whole thread and shoulder seem to be off centre.
What's gone wrong here? Is it too much for wood turning?
There's not enough meat left to turn to a smaller thread. Starting from scratch will double the price of the lathe. Building up and trying again is an option I suppose but I've read it's not a good idea. Do I have any other options?
I don't know what's gone wrong but I seem to have a bit of runout after getting it back together. I've attached a video showing a ~3mm flathead screwdriver up next to the spindle shoulder, no dial indicator sorry. The flange and the taper (MT3 to MT2 sleeve) are both still running true but the whole thread and shoulder seem to be off centre.
What's gone wrong here? Is it too much for wood turning?
There's not enough meat left to turn to a smaller thread. Starting from scratch will double the price of the lathe. Building up and trying again is an option I suppose but I've read it's not a good idea. Do I have any other options?