Re: [CAD_CAM_EDM_DRO] EMC error message, etc

Ozzie@... 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