# Inaccurate test carve

**URL:** <https://community.inventables.com/t/inaccurate-test-carve/144330>\
**Category:** Troubleshooting\
**Created:** [June 13, 2023, 5:41pm UTC](https://community.inventables.com/t/inaccurate-test-carve/144330 "2023-06-13T17:41:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![MathiasMaier](https://avatars.discourse-cdn.com/v4/letter/m/b38774/32.png) [@MathiasMaier](https://community.inventables.com/u/MathiasMaier)\
**Post date:** [June 13, 2023, 5:41pm UTC](https://community.inventables.com/t/inaccurate-test-carve/144330/1 "2023-06-13T17:41:36Z")

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Unfortunately I have problems with the accuracy of my x-carve 1000x1000mm (upgraded version).

Today I milled a test cube with dimensions 50x50mm from 18mm pine (1/8 double flute straight, suggested cut-settings).

The cube measures only 49mm in both the x and y axis, even though I calibrated the steps in GRBL.

In addition, a small lip remained at the starting point of the carve passes.

Do you have any idea what this could be or has anyone ever had similar behavior?

 ![20230613_193656](https://canada1.discourse-cdn.com/flex009/uploads/inventables/original/3X/5/9/59c14e1a9f579ff4003d20cc95546723a179e41b.jpeg)  
 ![20230613_193645](https://canada1.discourse-cdn.com/flex009/uploads/inventables/original/3X/f/4/f4b796e534b0fecf41b44c06a30aee0f978189c3.jpeg)

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**Author:** ![MarkA.Bachman](https://avatars.discourse-cdn.com/v4/letter/m/bb73d2/32.png) [@MarkA.Bachman](https://community.inventables.com/u/MarkA.Bachman)\
**Post date:** [June 15, 2023, 12:35am UTC](https://community.inventables.com/t/inaccurate-test-carve/144330/2 "2023-06-15T00:35:22Z")

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Is that lip about 0.5 mm?  
If so I would guess the problem is deflection. I would not expect the bit to deflect that much so I am guessing you have play in the V wheels or your belts are not tight.