Slotting Saw Arbor for Unimat

[Paul Jones]

PJs,

I just reviewed my old article about modifying the 40T gears and looked again at the photo of the lathe quick change gear box diagram. I wish I had looked a little closer at the left-hand side diagram because the I could have cut a 1mm pitch thread with the existing 40T gears but have to reverse the lower 40T gear to get the 127/120 ratio.

The 30T gear just provides more typical metric thread pitches. The only challenge with cutting metric threads on this lathe is that the split nut has to stay engaged and the motor reversed for each threading pass.

Paul