Maslow Chain Tensioner / Keeper (outta trouble)

thingiverse

After adjusting the chain around the sprocket due to low bungee tension, I created this system with specific objectives in mind. No springs were incorporated, and no bungees were used, ensuring that the chain stays on the same plane as the sprocket at all times. Excess chain was kept away from interfering with loading a sheet of plywood. I am grateful to Min T Lin for his work on his parametric pulley file (I added a few lines of code to it so you can press fit a 608 pulley into it using a vise). The square pulley design was necessary, which is why I created that specific one. The small wedge pieces are used to hold the rear rail in place, securing the 1/8 by 1" aluminum rail for the rear pulley. To secure the front rail, I simply used two 1/2 nuts. For a full video of this project, check out YouTube JtandHz. When setting up, use the square bottom pulley for the rails and the curved bottom pulley for the rope and chain. Two 2.5# weights were utilized to maintain constant tension on each chain at all times.