calculating stepper motor size?

[Jon Jessen]

Hi, This is my first post in this fantastic forum.

And I have some classical questions.
1. What kind of stepping motor is best for my setup?
2. And how do I calculate it?
3. How low/high shall I gear the motor?

Purpose of my mill:
It must be as accurate as my wallet allows, my dream is +/-0.03mm/300mm.
I am hoping to make a high feed mill, with a maximum of 0.2mm in operation.
Dream Feed is 800-1600mm/min.
Materials to be worked in are aluminum, cobber and brass.
Endmill size Ø0.2mm to Ø6mm
HF spindle 8000-24000rpm @ 1500W

Equipment info:

X axis
Minimum load 30kg.
Maximum load 50kg.
Screw pitch 10mm
Screw dia. 31mm
Travel 600mm
Accuracy Grade C3 or C5
Connected with belt to motor, gearing possible


Y axis
Minimum load 21kg.
Maximum load 40kg.
Screw dia. 11.56mm
Screw pitch 3mm
Travel 200mm
Accuracy Grade C2
Connected with belt to motor, gearing possible


Z axis
Minimum load 27kg.
Maximum load 35kg. +operation
Screw dia. 11.56mm
Screw pitch 3mm
Travel 300mm
Accuracy Grade C2
Connected with belt to motor, gearing possible

All linear guides is new THK LM RSR 15WV
4 blocks can carry a 50kg. Load.

I have one special build NEMA 23 size stepping motor. (one of the round ones)
Here is some info:
MAE - HY 200 – 2240 - 460 A8
4 phase 4.6 A/phase – 0.480 ohm
I don’t know holding torque/bipolar but it is properly a more then 162N/cm (230oz/in)

I hope that someone will take the time to help me – thanks.

Jon Jessen

[jschmitt]

try these sites
http://zone.ni.com/devzone/cda/ph/p/id/223
http://www.orientalmotor.com/product.../TecMtrSiz.pdf
http://pminmo.com/PMinMOwiki/index.p...chanical_Power