# System to compensate for chain sag

**URL:** <https://forums.maslowcnc.com/t/system-to-compensate-for-chain-sag/1846>\
**Category:** Hardware\
**Created:** [January 10, 2018, 8:03pm UTC](https://forums.maslowcnc.com/t/system-to-compensate-for-chain-sag/1846 "2018-01-10T20:03:18Z")\
**Posts on this page:** 1\
**Showing post:** 20

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**Author:** ![Joshua](https://avatars.discourse-cdn.com/v4/letter/j/48db29/32.png) [@Joshua](https://forums.maslowcnc.com/u/Joshua)\
**Post date:** [February 19, 2018, 6:31pm UTC](https://forums.maslowcnc.com/t/system-to-compensate-for-chain-sag/1846/20 "2018-02-19T18:31:29Z")

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> [@Brr](#):
>
> It is hard to get the tension on the bungees right across the whole work area

@dlang posted on a chain take-up idea a few weeks back, which I thought had a nice alignment with this.

[https://forums.maslowcnc.com/t/chain-take-up-idea/1999](https://forums.maslowcnc.com/t/chain-take-up-idea/1999)

His idea was to have a circular wheel to wrap the excess chain around, and use a stretchy-rope to create rotational tension to pull on the chain. I thought that idea supplemented this idea, because the disk for the stretchy-rope could be a slightly larger diameter than the disk for the chain; it could be larger by any fraction, so that the motion ratio was not restricted to fixed fractions, unlike the above solution. It could be just 10% bigger in diameter, such that the amount of stretchy-rope take-up was only 10% more than chain take-up. This compares to 50% with the above solution. I thought that the ability to tune the motion ratio to anything, not restricted to fixed ratios, would enable better calibration of the tension across the entire work-area.

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