# Z-axis grinding and going up then down and triggering estop **URL:** \ **Category:** Uncategorized\ **Created:** [January 13, 2025, 5:36pm UTC](https://forum.onefinitycnc.com/t/z-axis-grinding-and-going-up-then-down-and-triggering-estop/30441 "2025-01-13T17:36:39Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![Glacys](https://avatars.discourse-cdn.com/v4/letter/g/ccd318/32.png) [@Glacys](https://forum.onefinitycnc.com/u/Glacys)\ **Post date:** [January 13, 2025, 5:36pm UTC](https://forum.onefinitycnc.com/t/z-axis-grinding-and-going-up-then-down-and-triggering-estop/30441/1 "2025-01-13T17:36:39Z")
I am having issues with the Z-axis. When i start the machine up and home it the Z axis goes up and down then triggers the Estop. When i try to manual move the z after it just grinds and doesn’t move at all or moves in the opposite direction I’m trying to move it ---
**Author:** ![OnefinityCNC](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/onefinitycnc/32/7_2.png) [@OnefinityCNC](https://forum.onefinitycnc.com/u/OnefinityCNC)\ **Post date:** [January 13, 2025, 5:47pm UTC](https://forum.onefinitycnc.com/t/z-axis-grinding-and-going-up-then-down-and-triggering-estop/30441/2 "2025-01-13T17:47:26Z")
Wire issue in z: > [@Troubleshooting: Rail is getting hung, stuck, grinding, or moving in opposite direction](https://forum.onefinitycnc.com/t/troubleshooting-rail-is-getting-hung-stuck-grinding-or-moving-in-opposite-direction/10826): > > Rail is getting hung/stuck/grinding. Special notes to read before following each step: A rail getting stuck/hung is typically one of two things, either a wire/connection issue or the grub screw on the ball screw isn’t tight on the side that isn’t moving. One thing to remember, stall homing adjustments do NOT affect rail movement during cutting or jogging. If the rail isn’t moving correctly during cutting or jogging, incorrect stall homing is an affect of this greater issue. Any time the axis …