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Messages - jeanhank

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General Mach Discussion / Re: Inconsistent Axis Movement
« on: January 04, 2012, 06:35:53 PM »
Sure enough, the active state was set incorrectly, but fixing that didn't solve the problem.
I'm not sure that the inconsistent movement is caused by motor calibration (see above).  Any other ideas from anyone?

General Mach Discussion / Re: Inconsistent Axis Movement
« on: January 04, 2012, 01:25:18 PM »

Thanks for your reply. 

We are using stepper motors.
I am indeed referring to the utility to set steps per unit.
What do you mean by "active state" of the step pins?  As far as I know, these are configured correctly, as the X and Z axes work fine.

General Mach Discussion / Inconsistent Axis Movement
« on: January 04, 2012, 12:45:12 PM »
Hello all,

I've been configuring Mach 3 to work with our machine, an old Shizuoka knee mill driven with Geckodrive.  I've been using the built-in motor tuning wizard in Mach 3 and running a simple square contour to test programmed movements vs. actual movement.  The problem is that I've been getting a trapezoid -- the machine moves the intended 5.000" in the Y- direction, but 4.9985" in the Y+ direction. 

Our mill has a dial located between the motor and the leadscrew, and the dial indicates this discrepancy as well, which to me suggests that the problem is that the motor itself is not turning the same number of steps in both directions.  If the problem were backlash, the dial would indicate 5.000" in both directions, since the error would be after the motor and dial, correct?  In any case, backlash compensation did nothing for us.

A mistuned motor should move the same (wrong) amount in either direction, right?

Anyone have any idea what the problem might be, and how to fix it?


Pages: 1