An example on how to compute external-toothed gear ratios. It explains: the direction of rotation of external-toothed gears; simple gear ratios for two gears in mesh, three gears in mesh; and compound gear ratios (four gears in mesh). The trainer was designed with a stepped pin that allows the larger gear to mesh with the cluster gear to form a compound gear ratio.
The 3D printable STL files are on Thingiverse
https://www.thingiverse.com/thing:7347293
For a related video on the origin of this trainer.
https://www.youtube.com/watch?v=qip0_5czymk
Here is a link to my textbooks.
https://www.g-w.com/heavy-equipment-power-...
https://www.g-w.com/hydraulic-systems-mobi...
Here is a link to our summer workshops.
https://kccte.pittstate.edu/workshop/mobil...
