Re: Geckodrive

=rque limit independent of speed. Nothing is gained by slowing the

> motor down; if the continuous rated torque 250 in-oz, it's the same
> at 3,000 RPM and at 1 RPM. The only benefit would be if the work-load
> decreases with speed.
>
> In a word, if the G100 can monitor the servomotor encoder, it can
> adaptively slow the servo down if the following error exceeds a set
> threshold.

Well, that certainly will work in milling applications, as I will
be doing, along with many other applications. Lighter the cut,
the lighter the load on the motors.

>
> An apt analogy with which to view step motors is to imagine a
> constant-speed motor attached to an infinitely-variable gearbox. The
> step pulse frequency modifies the gearbox reduction ratio; double the
> ratio and you get half the speed at twice the torque, etc.
>
> You don't get that with servomotors.

No you can't. But nothing is free. If you size the servo motors
right you will not need "variable torque". You will get all your
torque regardless of speed. And yes, I have properly sized motors.

>
> Finally, give the poor step motor a break.:-) It too is a mighty
> servomotor deserving of respect when run closed-loop. What is your
> servomotor outside a closed-loop? Just an ordinary AC or DC utility
> motor.
>
> Mariss

I am on the verge of buying drivers and was thinking about Rutex,
but I would certainly use yours if this G100 interface provides
me with a significant advantage. What I liked about the Rutex is
the adjustable following error, the runaway control if you loose
an encoder, and a couple of other neat features.

Thanks,
Scott