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I watched that video too - and was about to comment on it after responding to everyone's replies. Yes, it's a good video and is making me feel more confident about this as a solution. Didn't he use epoxy to fix the sleeve? Haven't got there yet, now you've spoiled the ending! Boxford nuts might be more awkward to set up for the boring operation because of the levers but I think the the overall process looks very convincing. It might be handy to have a stub of leadscrew to help centre the nuts for boring. W. Posted by Howard Lewis on 03/04/2021 16:04:24:

The Atlas 12 x 24 which we are getting into running order has a screw on spindle mount similar to the Boxford and, slightly bigger than Myford. When I decided to add a 160mm three jaw chuck, the chuck body had enough metal in it to enable the bore to be increased to just about 1 3/4". The spindle thread is 1 1/2", so a drawbar with a flanged end 1.74" diameter would stop the backplate from unscrewing if reverse was used. This has the drawback of blocking the spindle bore. As already mentioned, threading in reverse using a left handed threading tool to produce a right hand thread allows you to...

hello, what a fascinating place this is, I just went down a 4 hour worm hole reading the threads of what you guys make & what you use. i have lurked here sporadically over the years as Google has lead me to landing on threads with answers I had to engineering questions. I'm no model engineer or engineer of any kind, woodworker by day hand making drums (musical) or restoring & repairing them for people.... but its a trade that has often needed me to do small amounts of metal working & this seems to be getting more & more frequent as I build/repurpose/modify more complicated machinery to do t...