Hi,
I am trying to cut 7/8 x 14 threads to make the equivalent of a Lee push through sizer. This is the first time I have ever cut threads. The problem I ran into is that I don't have the correct change gears. The diagram in my lathe says that I need one spindle with both 20 and 40 tpi gears. I don't have either one!
Can I substitute another 2:1 ratio set of gears for these, such as 24x48? If I did that, would I also need to reduce the size of the next gear in half to compensate? I would think so, but it may not be possible with the gears I have.
The lathe is a Craftsman/atlas 6" lathe. The change gears I have are 24, 32 (two), 36, 44, 46, 48, 52, 54, 56, and 64.
The screw gear for the 14 tpi is 56.
Any suggestions on where to pick up a 20 and 40 tooth gear? I checked eBay but didn't find the specific gears.
Thanks,
John