I'm very new here, but have spent the last few months reading the forums and doing some research on a CNC mill. The general advice on machines was bigger is better, so I jumped on a deal for a ZAY7045. The machine is set up in the shop and has made some manual chips, but now it is time to make the machine sing. The G540 driver seems like a fantastic bargain, but I am wondering if it is too small for this mill? I don't need super fast rapids, so 1200 oz-in steppers seem overkill. I am mainly making small aluminum parts right now that have less than a 4" x 4" x 2" envelope.
In your experience, what size stepper motors do I really need?
It seems that any motor over 480 oz-in would be fine with reasonable travel speed.
homeshopcnc.com sells a RS23-570 @ 570oz-in that seems like it would work with the G540 (inductance is right, but it can take more current than a G540 can provide) = lower torque if only driven with 3.5A?
kelinginc.net has a KL23H2100-30-4BM @ 495oz-in, but the inductance is ~7mH which is more than the specs for G540
Are there any other steppers out there that would match up better?
Budget for the electronics (3 motors, drivers, BOB) is <$800 and simple is better. Am I asking too much out of the G540? Should I step up to G203s and NEMA 34 motors?
Thanks for your help!