# Machine not able to be calibrated

**URL:** <https://forums.maslowcnc.com/t/machine-not-able-to-be-calibrated/3410>\
**Category:** Troubleshooting\
**Created:** [April 16, 2018, 8:24pm UTC](https://forums.maslowcnc.com/t/machine-not-able-to-be-calibrated/3410 "2018-04-16T20:24:20Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![bar](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/bar/32/10_2.png) [@bar](https://forums.maslowcnc.com/u/bar)\
**Post date:** [April 16, 2018, 8:50pm UTC](https://forums.maslowcnc.com/t/machine-not-able-to-be-calibrated/3410/2 "2018-04-16T20:50:01Z")

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Are you seeing this error at the end of the calibration process?

This usually happens when the math can’t find a value for the chain sag correction which isn’t negative (which would make the chain lighter than air).

Just to establish some baseline sanity I would try doing manual calibration:

 ![image](https://canada1.discourse-cdn.com/flex031/uploads/maslowcnc/original/2X/b/b4abc361b8e8cdb51cef71ea8107eec2ba4bd2ee.png)

And then to dial it in run the test pattern:

 ![image](https://canada1.discourse-cdn.com/flex031/uploads/maslowcnc/original/2X/4/4dce113b843af96fc7f77c318500a8ba785b8896.png)

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