On 02/03/2019 09:49 PM, Robert Duvall
wrote:
Thank you everyone for the great information. Mike what a great
find.that hardened shaft looks amazing. So I do have timken
bearing in this lathe so when ?I restored this lathe a year ago I
changed them out and set the preload correctly. Being that the
headstock is an interference fit to the bed maybe there isn¡¯t a
problem with the headstock to bed alignment. Maybe there
misalignment with the tail stock or something going south with the
cross Slide?
OK, the next thing to check for is twist in the bed.? A master
precision level is the tool for this, but there are some other ways
to measure it.? Also, wear of the bed, especially the rear vertical
face can cause taper problems.? Use the best dial or digital caliper
you can find (or a 6-7" micrometer is the right size, I think) and
measure front to back at several points along the bed (6" from
headstock and 1" from the tailstock end) and see if there is a
difference.? If the difference is significant, then you have a real
problem!
Jon
