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Clockwise
I'm not sure that a tap is definitively the way to go for what you want. It might be worth asking your local CNC machinist if they can thread mill your cranks instead. Fixturing is going to a PITA either way, especially for the NDS, and threadmilling will have much lower cutting loads than a great big tap, so you're less likely to rip the crank out of the vice.
https://www.youtube.com/watch?v=rDnavOlGcdc