# X motor calibration **URL:** \ **Category:** General\ **Created:** [May 21, 2026, 5:21pm UTC](https://forum.pwncnc.com/t/x-motor-calibration/3712 "2026-05-21T17:21:41Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Paultommy](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.pwncnc.com/paultommy/32/340_2.png) [@Paultommy](https://forum.pwncnc.com/u/Paultommy)\ **Post date:** [May 21, 2026, 5:21pm UTC](https://forum.pwncnc.com/t/x-motor-calibration/3712/1 "2026-05-21T17:21:41Z")
Hi can anybody help with the following problem that keeps occurring ? When jogging my X axis from the home start position (then zeroing ) to a setting of 832 mm, it only measures 520mm when finished, but the reading on the Masso control panel says 831.99 mm The other axis are all fine , I’ve checked the settings, and they all seem to be correct ---
**Author:** ![Chris](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.pwncnc.com/chris/32/54_2.png) [@Chris](https://forum.pwncnc.com/u/Chris)\ **Post date:** [May 21, 2026, 5:29pm UTC](https://forum.pwncnc.com/t/x-motor-calibration/3712/2 "2026-05-21T17:29:21Z")
Check your dip switches on the motor themselves and validate that’s what the software says. Don’t adjust your dip switches with the unit powered on. Then for the calibration… > [@Masso Stepper Calibration](https://forum.pwncnc.com/t/masso-stepper-calibration/3567): > > The other day I cut a 42" diameter circle for a table, to my surprise it was 41¾ x 41⅞. I don’t normally do projects this size, and the .006" per inch was something that never bothered or was noticed by me. I used the built in calibration wizard at like 12", and it was good enough for smaller projects. What i did to correct it: Create a gcode in my Cad software with 2 single lines 46" apart about 1" long. Make sure the tool paths are on the outside of the lines with the smallest bit (1/16" e… ---
**Author:** ![Paultommy](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.pwncnc.com/paultommy/32/340_2.png) [@Paultommy](https://forum.pwncnc.com/u/Paultommy)\ **Post date:** [May 21, 2026, 5:48pm UTC](https://forum.pwncnc.com/t/x-motor-calibration/3712/3 "2026-05-21T17:48:38Z")
Thanks @Chris , I’m not sure what the settings are but I dropped the distance per revolution down from 15.90000 to 10.00000, and it’s spot on, give or take 0.25mm, but I’ll collaborate to precision when I’ve got a bit more time on my hands, much appreciated 🙂