How big of a motor should I use?

[runinbymdnt]

I am finishing an industrial (light duty) router I purchased.
The cutting envelope is 50x50x12.

The gantry is constructed from thick aluminum tooling plate and must weigh 70-100 lbs. once constructed with rails, cars, screws, motors and all hardware and bearings. Not to mention the router.

It was designed for steppers and for simplicity, I can live with that for now. (34 frame)

What I dont know is how big a motor I should be thinking of using.
Dont know what is a good brand either.

I listen to any and all tips and advice.

If any of you could put me in the ballpark with motor size or some specs and a brand name, I wont be guessing when I go to the trade show (anaheim convention center) next week and look for a deal ( you know, the special show price game!!)

thank you as allways
Jim

[higgrobot]

Depends, what are you going to cut with it? Are the screws an ACME or a Ballscrew?

I'd be happy with 550 ozin if it had ballscrews, double if i were planning on cutting aluminium. If it had ACME screws then it's going to have 1/3-1/4 torque transfer of the ballscrews so look at bigger steppers and drivers. I'd be looking at cheap rolled ballscrews before getting huge steppers and drivers, like i said, it all depends.

[runinbymdnt]

Thanks Higgrobot. I will be using rolled ball screws.
You say bigger if I will be doing aluminum. I might do some.

Do you have a brand or a co. you like?

This project would be much harder without this forum. Thanks for the help.

[higgrobot]

Have a look over some of the US builds in the forums and you should get an idea of what's being used. In Australia where everything is very hard to find we can get cheap Italian 1070ozin MAE's and Japanese 1300ozin MYCOM's, so in the USA you should just about be falling over them.