Re: [CAD_CAM_EDM_DRO] Re: EMC Contouring Settings/ downloading BDI

Art Fenerty wrote:

> Hi All:
>
> I have an EMC question. Does a move like "G01 X .01 A180" cause a servo
> fault or stepper motor race condition? The Math of my trajectory planner,
> which is based on EMC's exhibits this problem. I have performed a fix to
> stop it for now, but I'm curious if EMC's trajectory planning routines have
> the same bug. I'd appreciate someone with a rotary axis giving this a try.
> You can actually see just from looking at the display that the A takes off
> too fast so you don't really need a physical A-Axis to see it.

Well, what is the feedrate? How, in fact, do you calculate the feedrate
without knowing the radius of the object relative to the center of the
A axis? The only way I can figure this out for EMC, is that you'd
manually have to figure out the acceptable time for the A axis to
move 180 degrees (I assume that is what you are doing) and then
compute a linear feedrate for the X axis that will take as long.
Assuming it takes 6 seconds for the A axis to turn 180 degrees,
the feedrate should be .1 (minute) * .01 (inches) = .001 IPM.
Is this the problem you are having?

Jon