Servo turning the wrong direction during calibration

[Gero]

I changed to bottom feed because:

• replacing bungees with weight. That gives a constant weight on the slack chain. Bungees are weakest when needed and strong when not needed.
• getting the chains away from the sides gave me the chance to slide my sheet left/right to utilize the more accurate centre of the frame if the project does not need a full sheet.
• the chains get less chips/dust at the top

My at that time 0$ approach that work perfect is here:

Poor man weight chain tensioning

A ugly proof of concept that it is possible with scrap and the stock material. Remodelling my frame 1 to become frame 2, life has set the budget to -0$, so that is what I had to work with. Targets: Switch from top-feed to bottom feed Reduce top beam flex as much as possible Get rid of the bungee cords Align the chains with the motor sprockets on sled and slack side (I assume I can get away without any chain guides. If not they are easily added at no cost as well) The start was a balanced sl…