I am using the hobby cnc driver as well and can say it offers great performace for the price. You will want to use as close to 40 volt supply that you can get so you get the most from the motors. Check Mcmaster Carr for the acme screws and nuts. I would recomend 5 tpi directly connected to the motor. If your table motion is smooth you should be able to cut at 100 imp or better.
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