# Z-Axis Zero changes when Circular Sled is Started

**URL:** <https://forums.maslowcnc.com/t/z-axis-zero-changes-when-circular-sled-is-started/4107>\
**Category:** Troubleshooting\
**Created:** [May 27, 2018, 7:21pm UTC](https://forums.maslowcnc.com/t/z-axis-zero-changes-when-circular-sled-is-started/4107 "2018-05-27T19:21:19Z")\
**Posts on this page:** 1\
**Showing post:** 26

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**Author:** ![blurfl](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/blurfl/32/9_2.png) [@blurfl](https://forums.maslowcnc.com/u/blurfl)\
**Post date:** [July 5, 2018, 1:13am UTC](https://forums.maslowcnc.com/t/z-axis-zero-changes-when-circular-sled-is-started/4107/26 "2018-07-05T01:13:54Z")

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It looks to me like the traveller hits the end stop before the motor stops, around 0:35 in the video. See the shaft turning but the traveller unable to move. That’s how the orange ‘locking tab’ gets damaged - not uncommon, [see here](https://forums.maslowcnc.com/t/r22002-z-axis-locking-tab-replacement/4556). In practice, the traveller should live in the center of the lead screw and never come near the end. It can be a chore to move, especially once it has crashed, and I often forget to remove the bungee cord before moving it, but it’s important that the traveller never reach the end of its range of travel.

![34%20PM](https://canada1.discourse-cdn.com/flex031/uploads/maslowcnc/original/2X/9/908c6935785c6d3361444233827d9840ff4f027b.jpg)

The tabs aren’t expensive - $2 or $3 - and the shipping is often higher than the part. Search for ‘Ridgid 513396001’ Look for a vendor with the parts in stock, many list them as ‘special order’.

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