What size stepper motor do I-need.

[masinecc]

How can i calculate what motor size i need for my gantry if i use rack and gear on both sides. This example is for ballscrews. Looking forward for your answer.

[Boyan Silyavski]

How can i calculate what motor size i need for my gantry if i use rack and gear on both sides. This example is for ballscrews. Looking forward for your answer.

Backwards. Choose the RP size, gearing so that you have as a result normal rapid speeds with acceptable resolution. Then figure how many RPM you need in reality so you have mostly that in mind. Then you go back to the gearing ratio and gantry weight and from there you decide Nema 23 or 34.

Obviously as the RPM is the important part here cause most possible it will be well geared, then you finish with low impedance motors driven by high voltage.

And knowing that nema 23 motor driven at 70VDC moves a gantry max 50-60kg with gear 1:1 without problem at 10m/min via ballscrew, you can figure the motor you need for your case.

[Robin Hewitt]

Nobody works it out, they just assume that the biggest motor they can find has to be the best option. Then they buy a set of 3 because that saves even more thinking and they end up with a Z axis that could raise the Titanic and is so heavy the gantry has to be made from RSJ

[Boyan Silyavski]

Nobody works it out, they just assume that the biggest motor they can find has to be the best option. Then they buy a set of 3 because that saves even more thinking and they end up with a Z axis that could raise the Titanic and is so heavy the gantry has to be made from RSJ