[davec243]

A newbie jogging question, with Mach 4 and UC100 motion controller.

With Mach 4 incremental jogging set at 0.0010 successive clicks of the X+ button produce the following DRO readings:

.6222
.6241
.6232
.6251
.6242 and so on.

This happens with X, Y, and Z sometimes with bigger jumps.

I am thinking this is a settings issue but not sure what.

[ger21]

What are your steps/ unit set to. If you're steps/unit don't divide evenly into .001 increments, then you can't jog in .001" increments.

[davec243]

Steps per unit is set to 16256 with a 1605 metric ball screw. 10,000 might be better?

[davec243]

10,000 didn't help. Might have to understand the math better.

[ger21]

Steps/unit are dictated by your hardware, and microstepping amount. You can't arbitrarily change them.

[davec243]

According to this math:

The formula for the motor tuning is as such:

5mm pitch ballscrew (common on georges machines)
5mm travel per turn of the ballscrew
Converted to inch = 5.08 turns per inch of travel
Driver Microstep resolution = 4000ppr

4000 X 5.08 = 20320

I should be at 16256 (microstep setting on MX 4660 is 1/16=3200), which is where I was.

I am not sure why it does the "two steps forward and one step back" thing.

[KH0UJ]

Post your drive motors model, Breakout board model, You cant just set things up which is not supported on your current set-up, custom setting it above or below your hardware`s capabilities will result to an offsetting issues on either of your drives, a pain in the ass for short

[davec243]

Motors are Leadshine HS23B30A, with Leadshine driver MX4660, with dip switches set to 1/16 - 3200 steps per revolution, Mach 4, UC100 motion controller converting my USB cable to the 25 pin connector on the MX 4660.

I think the 16256 steps per inch is right.

Just not sure why it goes +X then -X when I am pressing the X+ button both times (see consecutive list of DRO readings above)..

[KH0UJ]

On your scenario I think it`s an acceleration issue, (axis doing backflips) try adjusting the acceleration on the ports and pins to eliminate it.

[davec243]

Thanks, I'll try that after I shovel my driveway.

[davec243]

I tried cutting the acceleration from 30 to 20 and it did not seem to help. I am wondering if it is a shielding issues. My motor wires are not shielded. Today (as on other occasions) jogging the Z axis .001 results in the X axis moving as well. It takes 2 clicks of the mouse to jog .001. The X axis would move .006 on one click and go back on the next - this was when jogging Z. It doesn't seem like it should do that.