Possibly a dumb question, but, with regard to the torque curve shown in http://www.cncrouterparts.com/cdata/...rque_curve.pdf it may seem that the best rpm to run that stepper is; well, as low an rpm as possible.
However, based on the fact that horsepower is proportional to rpm x torque, I calculated the following (rpm and torque values from the spec sheet above):
Code:
RPM Torque(N*m) power (no unit specified)
60 5 300
120 4.6 552
240 4 960
360 3.6 1296
480 3 1440
600 2.4 1440
720 2 1440
840 1.6 1344
960 1.4 1344
1080 1.2 1296
1200 1 1200
Based on that, the ideal range for this motor looks to be between 360 and 1080 rpm; indeed if I actually wanted a 60rpm output, it would be better to run the stepper at 600rpm, and gear it down by 10:1. Given (unrealistic) 100% efficient gearing, the 2.4Nm at 600rpm would become 24Nm at 60rpm.
Am I on the right lines here? My question is probably "in general" in relation to steppers rather than this particular model; I have no prior experience with them, but I'm considering having a go at a DIY CNC build.