Hello everyone! I'm in the process of designing my first cnc. I have a few questions. The electronics kit im looking at uses 620 oz nema 23's. I want to do rack and pinion direct (no gear reduction). What size gear should I put on the motors and anyone know the cheapest place to get the rack and pinion parts? Also looking for best bang for the $ Z axis. Also any insight on grounding would be great! I appreciate any input!

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