# How does scaling work

**URL:** <https://forums.maslowcnc.com/t/how-does-scaling-work/26201>\
**Category:** Uncategorized\
**Created:** [September 5, 2026, 6:51pm UTC](https://forums.maslowcnc.com/t/how-does-scaling-work/26201 "2026-09-05T18:51:42Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Martijn](https://avatars.discourse-cdn.com/v4/letter/m/dbc845/32.png) [@Martijn](https://forums.maslowcnc.com/u/Martijn)\
**Post date:** [September 5, 2026, 6:51pm UTC](https://forums.maslowcnc.com/t/how-does-scaling-work/26201/1 "2026-09-05T18:51:42Z")

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I’ trying to cut a part which came out 2mm short in the y-direction.  
I set the y-scale factor to 1.003, and was expecting it to be 2mm larger in y-direction. Instead it is 2mm shorter. I assume the Y-scale is used to multiple, correct?

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**Author:** ![ian\_ab](https://avatars.discourse-cdn.com/v4/letter/i/a587f6/32.png) [@ian\_ab](https://forums.maslowcnc.com/u/ian_ab)\
**Post date:** [September 5, 2026, 8:07pm UTC](https://forums.maslowcnc.com/t/how-does-scaling-work/26201/2 "2026-09-05T20:07:46Z")

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Overall 4mm out?  
There is a manual adjustment you can make in the maslow.yaml file FluidNC then Config Items Maslow\_Scale\_X and Maslow\_Scale\_Y.  
Mine are set to 1.005 and 0.997 but this is a variable dependant on your setup.  
I moved the Maslow so it the edge was aligned with the spoil board. I then jogged the Maslow 2000 mm, then measured the distance travelled from the edge of the spoil board to the corresponding point on the sled. Distance theoretical/distance measured should give a good value.  
I used a laser measure to calculate how far the Maslow actually moved. Repeat process for other direction.  
Some people have reported that this varies for different points on the grid.

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**Author:** ![Tyke](https://avatars.discourse-cdn.com/v4/letter/t/76d3ee/32.png) [@Tyke](https://forums.maslowcnc.com/u/Tyke)\
**Post date:** [September 5, 2026, 8:36pm UTC](https://forums.maslowcnc.com/t/how-does-scaling-work/26201/3 "2026-09-05T20:36:40Z")

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Based on ian-ab’s reply I looked at my Maslow config and see that the X scale is 0.996 and the Y scale is 1.017.

Good to know. I will now have to check whether I need to tweak my defaults.

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**Author:** ![Martijn](https://avatars.discourse-cdn.com/v4/letter/m/dbc845/32.png) [@Martijn](https://forums.maslowcnc.com/u/Martijn)\
**Post date:** [September 6, 2026, 6:05am UTC](https://forums.maslowcnc.com/t/how-does-scaling-work/26201/4 "2026-09-06T06:05:01Z")

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Thanks both for your replies.  
The x dimensions are spot on, but in y direction it is slightly too small.  
I thought entering an y-scale \>1.0 would result in a larger workpiece in that direction. Instead it came out smaller, which took me by surprise.