Mornin' Gents,
Had a little time to play yesterday evening to play around with my
machine, so I decided to stick a dial indicator on both my X and Z
axes (I only have those two, it's a gantry machine that cuts tapered
triangular bamboo strips for making bamboo fly rods). The Z axis was
dead nuts on, but I was get varied responses to jogs on the X
axis. I tried it at .001, .05, .01 and .1 on the jog movement. At
.001, sometimes I'd get no movement (I'd here stepper motor noise but
no movement on the dial indicator), other times I'd get a half-thou,
and other times it would jump .002" - .004". At .01, the first
couple of jogs would show about .001" - .002" short of the full .01"
movement, then occasionally move the full .01", and then sometimes
slightly more than .01". About the same for the .05" movement. At
.1", the movement for the first few times was .003" - .004" short,
but then would move almost dead nuts on to .1" each jog. I don't
think backlash would come into play since all the moves were in the
same direction.
I disconnected the pinion gears from the racks, moved the gantry
back and forth the length of the X axis a few times by hand, and
didn't really notice any binding. It seemed pretty smooth, and
relatively easy to move a 165 lb gantry on the rails.
I thought maybe it was a software setting, so I futzed around with
the MAX_VELOCITY, MAX_ACCELERATION, and the STEPGEN_MAXACCEL. It is
pretty cool to see a heavy gantry zipping back and forth on the
machine at 180 inches a minute... ;-)
Anything else I should look at? Or should I keep concentrating on
tuning with the three variables above?
Thanks,
Mark
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