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I made a 62.5 tooth gear. Help me fix this

will two DP16 Gears with, say 28 teeth each, function differently than two similar gears cut with DP18 cutters. Allmof the same pressure angle. The only difference would be gear diameter, correct?
Correct. You cannot mix and match DP of meshing gears. (Gears in a cluster can have different DP, but the layers in a cluster gear do not mesh with one another.) But if you just need a pair of meshing gears, they don't need to mesh with anything else, and you have the room, you can use whatever DP cutters you have handy.