Craftsman 101.07403 change gears

If you just need the gears to control feed rates, a variable speed motor on the lead screw will work
 
Unless you have the ability to exclude hydrogen bubbles from your castings, you will be better off using some other method. Those tinny H bubbles really weaken castings. The castings will be brittle. A broken gear tooth getting loose among the other gears is a disaster waiting to happen. Zinc alloy is stronger!
 
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While the statement above about running the lead screw off of some sort of variable speed motor is true, I have yet ti see a practical implementation by an owner of any brand of engine lathe that was capable of cutting usable threads. You need to start out with about a thousand line spindle tac (not spindle motor tac) and a zero backlash drive to the lead screw capable following the master tac with a step by step accuracy. The typical implementation that people come up with starts with what amounts to a one-line tac and from there goes downhill.
 
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