# Z axis grind/not moving

**URL:** <https://community.inventables.com/t/z-axis-grind-not-moving/23188>\
**Category:** Troubleshooting\
**Created:** [May 2, 2016, 12:17am UTC](https://community.inventables.com/t/z-axis-grind-not-moving/23188 "2016-05-02T00:17:30Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![ScottWhite](https://yyz1.discourse-cdn.com/flex009/user_avatar/community.inventables.com/scottwhite/32/22120_2.png) [@ScottWhite](https://community.inventables.com/u/ScottWhite)\
**Post date:** [May 3, 2016, 12:33am UTC](https://community.inventables.com/t/z-axis-grind-not-moving/23188/6 "2016-05-03T00:33:22Z")

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I had a similar issue. Take the threaded rod off and roll it on a table, looking for run-out. That said, my issue ended up being an open connection between U1, pin 18 and J2 pin 4. This is the Z driver side on the G-shield and the Z wiring connector. I had also tightened the ACME rod Nyloc too tight causing run-out.

Look through my thread.

> [@Z Axis Wobble / Delrin Nut Run-out](https://community.inventables.com/t/z-axis-wobble-delrin-nut-run-out/22649):
>
> I’ve looked through some other posts but they didn’t seem to be the same issue. This is a new build with only a few test runs. I was noticing binding in the Z axis after assembly. With some tweaking of the motor current, V-wheel adjustments, and a little lube on the ACME screw, I was able to free the axis to some degree. I did my first test run yesterday and after a few minutes the Z axis bound up again. After troubleshooting the carriage, V-wheel tension, I wasn’t able to find it. I removed th…

Here is a link to the G-shield schematics…Z axis driver is U1 on page 3.

> <https://github.com/synthetos/grblShield/tree/master/hardware/gshield_v5_schematic>
>
> //github.com/synthetos/grblShield/tree/master/hardware/gshield\_v5\_schematic

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