help please

It is possible to set up gears so that two gears on one shaft are engaged with two gears on another shaft. Simply, if the sum of the gear teeth on one shaft is the same as the sum on another shaft. For example, a 64 and a 32 on one shaft engage with a 40 and 56 on another shaft woould lock the gear train. If the sums are close to each other, there still could be enough tooth engagement to lock the gear train. Normal threading and power feed setups are calcu;ated not to let this happen but the PO may have been playing around with the gears.
 
Yes, that's a possibility. And a better outcome than to find one of the gears or the lead screw seized up
 
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