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You've hit the root of my question. Why cut the power to the Chalupa? The drill and Chalupa would both operate in their strongest rpm window during low gear mode- no fighting. In high-gear the Chalupa would be spun at 2.4xs its free load rpm as the drill motor would be doing all the work (all we've changed is the drill assembly output speed by shifting its gear from low to high). The voltage would still be applied to the Chalupa so it's turning resistance should be less. Also back current shouldn't be able to over power the 12v applied? J#
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