Re: [CAD_CAM_EDM_DRO] Re: stepper motor in servo loop question

ballendo wrote:

>Elliot,
>
>What do you gain over just replacing the servo motors/drives in
>the "old...equipment"? Prices are lower. Reliability is higher.
>Tuning is easier. Why do this?
>
>Price, maybe???
>This method requires that the analog output section of the control be
>working. You trade the cost of the servo drive for the cost of the
>stepper drive(plus whatever VCO related circuitry you use). The
>motors will similarly balance out,IMO.
>
>In the end, you have lower performance at possibly a HIGHER cost...
>For reasons Mariss has eloquently explained, the stepper will never
>reach the performance of the servo.
>
>Could it be done? prob'ly. But should it be done? Not IMO.
>
>You may want to talk to Otto at MaxNC, as his CL "servo" system uses
>steppers with encoders....
>
>

My universal stepper controller board also can command stepper drivers
with step/direction
inputs and take advantage of encoder feedback. See
http://jelinux.pico-systems.com/univstep.html
for more info. This board can be used with EMC.

Jon