Re: Best source for Servo's ??

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Les Newell <lesnewell@f...>
wrote:

>
> Umm, A Bridgeport sized mill is usually fitted with something in

the

> region of a 30 in-lb motor. If you used a 250 in-lb monster on a

plasma

> cutter it would probably tear the gantry off and throw it though

the

> nearest wall!

Wow, am I way off. I assumed that a stepper with 300 in oz would be
too small for a Bridgeport and that some guys have problems with 50
inch oz on the Sherlines.

All this is great to know. I can't wait to start to move an axis
and see how it works !

Dave

>
> Assume that the motor has a top speed of 2000rpm and is geared for

a top

> speed of 200IPM. This gives 10 revs/inch.
>
> Assuming 100% transmission efficiency the thrust available would be

250

> * 2 * pi * 10 = 15707 lbs. If your gantry weighs 100 lbs you would

have

> an acceleration of 157g
>
> If you want a smaller driver than Gecko or Rutex then IMService

have a

> 30V 5A servo driver
> <http://www.cadcamcadcam.com/index.asp?

PageAction=VIEWPROD&ProdID=11>

>
> I think somewhere between 20 and 30 in-oz with a top speed of 2000 -

> 3000 rpm would be ideal for a plasma cutter.
>
> Les
>
> >We are obvously talking different types of machines. For a

plasma

> >cutter with a 4 ft table, I would expect that something on the

order

> >of 250 inch pounds to move the gantry, but double that for higher
> >speeds ?
> >
> >It appears to me that those motors are very light ???
> >
> >I was assuming that shotting for more than 20 watts was in order ?
> >
> >What driver would be best ? The Rutex and Geckos shoot for 70

plus

> >volts and some of the links show 9 volts.... Is there a lower

cost

> >driver that would handle the smaller motors for half the price ?
> >
> >Dave
> >
> >
> >
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