Re: [CAD_CAM_EDM_DRO] Re: deskcnc servo driver

Gregory Kamysz wrote:

>With servo controls how does the software know the machine has reached
>it commanded position if it starts to lag behind? I understand that the
>servo control knows that the motor is behind but if the pc sends the
>next command and it hasn't reached it's destination from the previous
>command what happens?
>
>

True closed-loop servo systems have position info available at the computer.
The Geckodrive systems don't generally work that way.

>I guess Geckos will only allow 125 step lag before faulting. Is this
>really a problem?
>
>

No, normally you don't want a lot of following error. Except in some
systems
with very high resolution encoders, the 128 count error limit is already a
bit large. For instance, in a system with encoder resolution equal to
.001",
an error of 128 counts is over 1/8"!

Jon