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- Dec 25, 2011
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I'll add one thing that only becomes apparent after you learn a bit about the Atlas lathes, but will allow you to tell at a glance whether or not a threading chart is applicable to your 10F. The original Atlas lathe, which was a 9", had change gears in sizes from 20 to 96 Tooth (nothing between 64T and 96T). The original 10" up through 10D used the same gearing. This was also used on the 101.07360 through the 101.07401 12" except that the 12" had a tumbler with a 32T tumbler gear that the variable gear train meshed with instead of with the 32T Spindle Gear. Some 12" charts call the Tumbler Gear the Spindle Gear because the charts were originally drawn for the 10" and didn't get completely edited before they were used with the early 12". The largest gear on the 10F is 64T. And it has a 32/16 compound gear called the Stud Gear on the charts. Sometimes the first idler gear meshes with the 32T and sometimes with the 16T.
Also, although most of the change gears in the two sets have the same have the same tooth count, gears from the two sets are not readily interchangeable. The early gears have a 3/8" face (tooth width) and a 3/8" hub length. The later ones still have a 3/8" face but have a 1/2" hub length. The late gears can be turned into early gears by facing the hub off 1/16" from each end..
Also, although most of the change gears in the two sets have the same have the same tooth count, gears from the two sets are not readily interchangeable. The early gears have a 3/8" face (tooth width) and a 3/8" hub length. The later ones still have a 3/8" face but have a 1/2" hub length. The late gears can be turned into early gears by facing the hub off 1/16" from each end..