I am refurbishing a South Bend 13 that I got from a tool dealer back in October. I ran it through all the gearbox combinations, checked out the reversing gears, etc. and all seemed fine. I brought it home and took it apart for cleaning, repainting, and repair of whatever parts might need it. I now have the spindle, gear train, gearbox, and leadscrew assembled. All runs fine, I can change gears, reverse the feed, change speeds, etc.
Now I have one question. On the tag on my gearbox, it says that the stud gear choices are 24T and 48T. Likewise in the parts sheet (Form 914C Section 2), it says those gears are 24T and 48T. However, my gears are 48T and 64T. I am able to adjust the banjo to set it up to run with either gear. One strange thing is that the geartrain cover won't fully close with the 64T gear on the outside (48T gear in use). With the 48T gear on the outside (64T gear in use), it closes fine. I never tried swapping the stud gears around before I took everything apart, so I can't be sure whether the cover originally closed with the gears in either position. This lathe came out of a tech school where I think it had served since its manufacture in 1971. Does anyone know of a reason why somebody would have put different stud gears on one of these lathes? As all the numbers are even, I am guessing they are not transposing gears for metric threading. I'm trying to figure out whether the gears I have are a legitimate setup for this lather or if I will want to obtain a 24T gear for it. I'm guessing that if I stick with the gears I have I'll probably have to make up a new threading chart. Or is there an alternate threading chart available for the gearing that I have?
Thanks in advance,
-- mike
Now I have one question. On the tag on my gearbox, it says that the stud gear choices are 24T and 48T. Likewise in the parts sheet (Form 914C Section 2), it says those gears are 24T and 48T. However, my gears are 48T and 64T. I am able to adjust the banjo to set it up to run with either gear. One strange thing is that the geartrain cover won't fully close with the 64T gear on the outside (48T gear in use). With the 48T gear on the outside (64T gear in use), it closes fine. I never tried swapping the stud gears around before I took everything apart, so I can't be sure whether the cover originally closed with the gears in either position. This lathe came out of a tech school where I think it had served since its manufacture in 1971. Does anyone know of a reason why somebody would have put different stud gears on one of these lathes? As all the numbers are even, I am guessing they are not transposing gears for metric threading. I'm trying to figure out whether the gears I have are a legitimate setup for this lather or if I will want to obtain a 24T gear for it. I'm guessing that if I stick with the gears I have I'll probably have to make up a new threading chart. Or is there an alternate threading chart available for the gearing that I have?
Thanks in advance,
-- mike
