Sizing servo motor for Rotary 4th axis

[zoeper]

I want to add a 4th axis to my CNC Mill and would like to get some opinions on motor size.

I plan on using a 150mm (6") Diameter rotary table with a 90:1 worm drive.
I would like to do production milling of aluminium parts in the 1-4" diameter range, with the odd steel or stainless steel part when needed.

My machine is already equiped with DC servo's and Anilam Drives for the 3 axis and the machine outputs a 0-10V signal and accepts the encoder signal back.

Can anyone out there please share their experiences as to power requirement, motor/ driver type and gearing to obtain good results with this conversion?

Pieter

[jalessi]

Pieter,

A 6nm servo at 90 to 1 is 540nm

That is a whole lot of torque.

http://www.kelinginc.net/ServoMotor.html

http://www.kelinginc.net/KL34-170-72.pdf

You would never need more than that.

The nema 23 would probably be fine.

http://www.kelinginc.net/KL23-130-60.pdf

[vger]

I built a 6 in turntable with 180:1 reduction. It's stepper driven with a small (nema 23) stepper running at 0.6 amps. It has LOTS of torque. I can't stop it by hand with both hands.

Steve