Stepper Motor Question

[Vinny]

I've decided to automate my cheap CDCO rotary table. I have all the electronics except the stepper motor. Well I have a stepper motor but it's WAY too big for this, which is fine 'cuze it's really intended for some level of CNC on my 7x.

So I'm looking at steppers. Is a NEMA 17, 40 oz/in motor sufficient to drive a rotary table?

[arvidj]

I had the same question years ago. It was pointed out that the worm on my table was 90:1 so the big deal was the need to overcome the friction rather than overcome what ever mass based inertia from what might be on the table. A NEMA 23 was recommended. I have the motor, the tables, the stepper driver and the controller ... http://www.worldofward.com/rotarycontroller/ ... but have not gotten a round-to-it to try it out.

http://divisionmaster.co.uk/divisionmaster.html for suggestions.

[EdK]

I have a NEMA 23 stepper motor if you want one for the cost of shipping.

Ed

[arvidj]

(01-29-2016, 11:58 AM)arvidj Wrote: I had the same question years ago. It was pointed out that the worm on my table was 90:1 so the big deal was the need to overcome the friction rather than overcome what ever mass based inertia from what might be on the table. A NEMA 23 was recommended. I have the motor, the tables, the stepper driver and the controller ... http://www.worldofward.com/rotarycontroller/ ...  but have not gotten a round-to-it to try it out.

http://divisionmaster.co.uk/divisionmaster.html for suggestions.

More data points that might be of interest ...

http://www.sherline.com/8700pg.htm ... Stepper Motor—120 oz-in, 2 Amp, NEMA 23 Frame size, 400 steps per revolution

http://bbs.homeshopmachinist.net/threads/45118-Stepper-size-for-a-Rotary-Table?p=616484#post616484 ... for an 8 inch table ...

[chucketn]

I used a NEMA23 with my Arduino setup to control a 4" Vertex RT, which is 90:1. Works great. I have made several gears with it.

Chuck

[Vinny]

(01-29-2016, 12:42 PM)EdK Wrote: I have a NEMA 23 stepper motor if you want one for the cost of shipping.

Ed

Depending on the length, I will probably take you up on that. PM about to be sent.

Thanks Everyone!!!