![]() EG: if B is 120 teeth and D is 48 teeth then the ratio of B:D is 2.5:1. The final ratio between B and D will remain unchanged. The number of teeth of gear C does not matter, you can use any spare change gear that you can get in there. ![]() So assuming that right now gear A (Clockwise) drives gear B (CCW) which in turn drives gear D (CW), inserting a gear between B and D changes things to A (CW) > B (CCW) > C (CW) > D (CCW). What you need to do is insert a gear into the change gear train between the headstock and the lead screw. They are still rotating in lockstep.ĭon't believe me? Chuck up a piece of material, mount a sharpie marker to the tool post, throw the lathe in reverse and see which direction the "threads" turn. Similarly, whether you turn the tool upside down (or mount the tool upside right on the back side) and cut in reverse makes no difference, you will still end up with a right hand thread because the relationship between the chuck and the lead screw has not changed. ![]() In other words, it just slows things down and has nothing to do with changing feed direction. I think "back gear" refers to a low gear between the motor and the headstock, not between the headstock and the lead screw.
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