I am wanting to true up the I.D of a lathe spindle and was wanting feedback on my potential plan of attack. The spindle bore is about 18" in length and 1.300 on the I.D. My plan was to do it like a line bore. I would first get a piece of rod stock 1"dia or maybe even 1 1/4" and a little over three times the length of the spindle. Drill a hole about 19" from one end and mount a tool in it. My next step would be build a couple of bronze bushings with an I.D to fit my bar. Now I would mount one bushing in the back end of the spindle and do what ever I needed to do to have that bushing run concentric. Finally I would mount my bar in my tool post and lock my cross slide so my bar was on centre. In short I would use the bushing in the back of the spindle to guide and steady my bar and I would move the tool on the bar to set my depth of cut. I would run my second bushing in the chuck after passing the tool into the spindle. I was hoping if I ran the lathe at a reasonable rpm and I kept my bushings well lubed I could get a reasonable finish. My motive is not to enlarge the spindle bore by any great amount but only to have it concentric with the spindle bearings. Please do not ask why I need to do this let's just say I have my reasons.
Your feed back will be very much appreciated
thanks.
Your feed back will be very much appreciated
thanks.