Re: [CAD_CAM_EDM_DRO] Brush DC servo not for contouring?

I would offer that max rpm does not mean high speeds
and accelerations are not possible. It's like saying a car
can only go so fast because of max engine rpm. Well, there
is the little matter of what the transmission does.

Getting to high speed fast really depends (among other things) on the motors
ratio of torque to polar moment of inertia.

And DC brush motors can be very very good at this figure.
The ones I use are not particularly low inertia but give
7100 rad/sec^2 lightly loaded. That's pretty quick.

Les
Leslie Watts
L M Watts Furniture
Tiger, Georgia USA
http://www.rabun.net/~leswatts/wattsfurniturewp.html
engineering page:
http://www.rabun.net/~leswatts/shop.html

----- Original Message -----
From: "kdoney_63021" <kdoney_63021@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, April 08, 2002 12:10 PM
Subject: [CAD_CAM_EDM_DRO] Brush DC servo not for contouring?


> In a recent post to another news group I got the advice:
>
> "I presume you will want to countour with this machine,
> possibly at fairly high feedrates. If so, stay away from DC
> brush-type servos since most are limited to 2300 to 3500
> RPM"
>
> Does this mean to contour I need high speed motors? To do general
> high power milling and routing on a gantry, which type of motors
> would be best.
>
>