Thanks to David Roseman for his pics on the original spindle on the G0766. His dimensions pretty much mirror mine.....I think mine measure .0001 more than his, but that is probably either the differences in calipers from his to mine, or possibly one of us was a smidgen over to one side more by .0001? When I get a chance Iwill post dimensions of the new spindle threads.......I did not neasure thread pitch on my original.
Thanks for the pictures, David. David's G0766 spindle pictures are similar to my original spindle - - a bit undersized in the major OD, although my spindle was rougher looking. But with some wear and tear (plus a jeweler's file and wire hand brush) the roughness is less now. Also, I have received a new spindle because Grizzly considered the physical appearance of my original spindle to be undesireable/unacceptable. I had posted some new G0766 spindle pictures a few weeks ago. The physical appearance of the threads and the Morse taper is much nicer now. But, the major OD decreased by at least 0.010, making the new spindle even further out-of-spec. (Kind of like cutting a board an inch too short and then re-cutting it thinking that it may get longer... ).....
I've actually been content with my original spindle -- finish as well as tolerances. I posted the five pics just to provide another data point, as Brice, Hu and maybe several other members have had issues with theirs. It does seem that the production has been uneven on this part in particular. Glad to see Grizzly is trying to address it. Thread finish on my particular spindle is very good, and for me, 1.234" is quite satisfactory for the major diameter. Awhile back, another longtime SMC member measured the major diameter of the spindle threads on his PM 3520B at 1.2305 with his set of Starrett calipers. Just another data point, but that seems a bit shy to me on a PM. But these are wood lathes, after all.
David, I sent my first 766 back due to shipping damage. The spindle in it looked and felt great. Since I didn't get as far as turning anything I don't know if that spindle was undersized or not. The OD is one of the more minor measurements, especially if it has obviously been deburred with a file. The OD is valid as one of the datum points to determine the profile if it hasn't been knocked down. Sharp or ragged edges are at least an indication that the shaft was oversized before turning the threads or the threads were cut too deep. The shaft being a little oversized but not so much the threads couldn't be cut to specifications is no issue of course and might be a good thing other than hard on tooling. The threads cut too deep means the entire profile is too small, not just the top of the threads. That is the problem with threads that need a determination, a lot of variables so it is always tough to determine how good threads are. Hu
