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Milling cutters with screwed shanks | Model Engineer
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New Chuck won t screw on | Model Engineer
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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:
BSW 1 1/2 x 6 | Model Engineer
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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 thread away from the chuck. Usually slow speeds are used and the forces are not great enough to be in much danger of unscrewing the chuck. I would loosen and retighten the chuck firmly before doing this tye of work.