# Calibration, chain length issue

**URL:** <https://forums.maslowcnc.com/t/calibration-chain-length-issue/15385>\
**Category:** Troubleshooting\
**Tags:** accuracy, calibration\
**Created:** [November 30, 2020, 8:03pm UTC](https://forums.maslowcnc.com/t/calibration-chain-length-issue/15385 "2020-11-30T20:03:33Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Mantisas](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/mantisas/32/18924_2.png) [@Mantisas](https://forums.maslowcnc.com/u/Mantisas)\
**Post date:** [November 30, 2020, 8:03pm UTC](https://forums.maslowcnc.com/t/calibration-chain-length-issue/15385/1 "2020-11-30T20:03:33Z")

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Have a problem with calibration. With tape measure distance between motors are about 3500mm, with automatic length calibration 342.01. After chain length adjustment pin inserted in second hole, then I say to sled go 550mm down in reality it goes 548, then up 550 - reality are 539, sides from center 550-551. Tryed to insert pin in to the first hole, but measurments are more far away from reality 550-530 center-top. So the best measurments are then pin are in third hole center top 550/548,5, center-bottom 550/549, center sides 550/550. There is problem? I missed somthing in calibration? Is way to do thine chain length adjustment? Or sprockets was not ideal leveled?

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**Author:** ![Orob](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/orob/32/16344_2.png) [@Orob](https://forums.maslowcnc.com/u/Orob)\
**Post date:** [December 2, 2020, 1:03am UTC](https://forums.maslowcnc.com/t/calibration-chain-length-issue/15385/2 "2020-12-02T01:03:45Z")

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webcontrol?