# One axis not going perpendicular to other

**URL:** <https://forum.lightburnsoftware.com/t/one-axis-not-going-perpendicular-to-other/185398>\
**Category:** GRBL\
**Tags:** longer-ray5\
**Created:** [November 27, 2025, 5:31pm UTC](https://forum.lightburnsoftware.com/t/one-axis-not-going-perpendicular-to-other/185398 "2025-11-27T17:31:07Z")\
**Posts on this page:** 1\
**Showing post:** 7

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**Author:** ![Aaron.F](https://forum.lightburnsoftware.com/user_avatar/forum.lightburnsoftware.com/aaron.f/32/87478_2.png) [@Aaron.F](https://forum.lightburnsoftware.com/u/Aaron.F)\
**Post date:** [November 28, 2025, 11:49am UTC](https://forum.lightburnsoftware.com/t/one-axis-not-going-perpendicular-to-other/185398/7 "2025-11-28T11:49:00Z")

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Here’s a nice way to test the squarenes:

> [@Gantry not square](https://forum.lightburnsoftware.com/t/gantry-not-square/82739/4):
>
> Set up the largest square / rectangle you can do in your machine, and put a dashed line down the middle. I used old wrapping paper. Cut it and then fold it on the dashed line. If the corners come out even, congratulations, your X is perpendicular to your Y. If they don’t, the mis-match is how far out of square you are. You adjust one end of your Y axis drive by that amount, and you are now square.

 ![image](https://forum.lightburnsoftware.com/uploads/default/original/3X/e/1/e194a8775355afdfb7a71a6a1b136b7ea2023242.png)

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