# Makermade M2 - CNCjs calibration issue **URL:** \ **Category:** MakerMade\ **Created:** [July 30, 2020, 4:25pm UTC](https://forums.maslowcnc.com/t/makermade-m2-cncjs-calibration-issue/14145 "2020-07-30T16:25:30Z")\ **Posts on this page:** 1\ **Showing post:** 27
**Author:** ![madgrizzle](https://yyz1.discourse-cdn.com/flex031/user_avatar/forums.maslowcnc.com/madgrizzle/32/1372_2.png) [@madgrizzle](https://forums.maslowcnc.com/u/madgrizzle)\ **Post date:** [August 7, 2020, 12:07pm UTC](https://forums.maslowcnc.com/t/makermade-m2-cncjs-calibration-issue/14145/27 "2020-08-07T12:07:42Z")
We worked on this a while back… it’s dated, but does talk about some of your questions… > [@Chain Length Calculations](https://forums.maslowcnc.com/t/chain-length-calculations/6029): > > Components of Chain Length Calculation At any time, the position of the sled on the MaslowCNC workspace is set by the amount of chain that extends beyond the 12 o’Clock sprocket top position, the geometry (or shape) of the frame, and the weigth of the suspended machine components. Sledposition accuracy is controlled by two things: The fitness of the calculation model built into the firmware The accuracy of values for the machine parameters used by the model. Note: This article discusses o… > [@zaneclaes](#): > > Examining the chain on the left sprocket, it seems the chain link at ~8 o’clock serves as a pivot location. This pivot does not actually change more than a fraction of a mm, regardless of the angle of the chain I think there’s a bit of a difference between the sprocket contact point between the lower-left corner and the upper-right corner (and same for lower-right and upper-left). Every little bit adds up when you are trying to improve accuracy. > [@zaneclaes](#): > > The more I look at these extreme corners, the more I’m certain it’s not as good as I had the Maslow Classic working… wondering if I can somehow compensate… With the model of the M2, I think the only way to overcome this is to modify the gcode to compensate for the errors, and I don’t know of any CAM software that will do this for you. --- _[View the full topic](https://forums.maslowcnc.com/t/makermade-m2-cncjs-calibration-issue/14145)._