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Yes, I
have taken the gear ration of 72:1 for my rotary table into account in figuring
the steps per degree which works out to 80 steps per degree when using 400 steps
per revolution on the stepper. 400 x 72 = 28800 / 360 = 80 steps per
degree. A unit of travel on the angular axis is 1 degree therefore
steps/unit = 80 which EMC does not seem to like at this time. I have
experimented with different settings and anything less that 1000 steps per
degree just does not work well at all. It seems that it is something to do
with a ratio of steps per unit vs steps per revolution on the axis.
Anything less than about 3.5% of the total step count for a revolution of the
table, 28800 x .035 = 1008 and EMC just can't handle it. I am sure it is a
granularity issue, it could even be a PID tuning issue. I just don't know
at this point. What I do know is that I will be doing my 4 axis work using
TurboCNC until this gets fixed or I figure out how to configure it. EMC
thinks it is moving the axis at the proper speed based on the display, but is
sure as heck isn't
John
Guenther
Sterling, Virginia
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