On 08/09/2017 11:33 AM, Dan Bloomquist wrote:

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You made me look. :) My wheels have no markings so taped a piece of
paper and made pencil mark. I mounted a .0001" dial indicator. I can't
see any backlash, just my wheel is sloppy. The wheel is 6 1/2" in
diameter and to get a .001" move, the outer rim moves ~.075". This is an
integrating solution to an accurate setup.

... snip

I'll try to remember to take pictures of my dial setup and post them. Each dial is housed in the box where the motor to screw coupler is. There is a window on the box for viewing the dial. One problem I have is that the stepper drivers are setup for quarter stepping so I have 0.00025" jumps. I can see this on the dials well enough, but the DRO display increments between these steps and I feel compelled to work out the DRO value at the time the last step trips, which wastes a bit of time. I replaced the x axis driver with an MA860H which has micro-stepping. The MA860H doesn't sing like the old drives and it can use twice the voltage. I'd like to change out the other axes when I can get around to it.

Kirk Wallace

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