Re: EMC error message, etc

Yes, following error, sorry.

Thank you for the info
Jerry

--- In CAD_CAM_EDM_DRO@egroups.com, Jon Elson <jmelson@a...> wrote:
>
>
> Ozzie@h... wrote:
>
> > In an open loop EMC stepper system, what is the meaning of:
> > ""Y" axis tracking error" ?
>
> Is that "following error"? EMC really still thinks it is running a
> closed loop servo system, and simulates the motion of the
> servo motors to generate the acceleration and deceleration
> curves for the stepper moves. If the requested acceleration
> exceeds the ability of the simulated servo to accelerate, it
> will lag behind the requested position enough to cause a
> following error. You can either increase the P term in the
> axis initialization parameters, or turn down the acceleration
> parameters in the trajectory section of the .ini file.
>
> > Also when attempting to home with no homing switches, and software
> > set that way, axis sometimes homes at -.00001 ???
>
> That is a combination of roundoff error and the gain of the
simulated
> servo
> system. More gain (P) might reduce the error. If it is
really .00001"
> (or .00001 mm) that is not much to worry about. (Even .0001" is
> pretty small compared to backlash and accuracy on most stepper
> driven systems.
>
> Jon