Servo Control Arm Push Rod Linkage Assembly Mating

james_sleeman

This seems like it should be something that is possible, but I can't work it out

I have a simple pivoting bogie wheels being rotated by a servo through a push rod



Everything is connected, I can rotate the servo horn and te pushrod moves, I can grab the push rod and move it about the servo horn following correctly, I can pivot the front wheel around it's center correctly, but no matter what I ry I can't make that last connection between the pushrod and the wheel bogies,

https://cad.onshape.com/documents/4dc71a6343911d61e19ed1f0/w/6370c16ba2491c37d570ebf0/e/21ccedd5221a9f342eae3737?renderMode=0&uiState=6377114e4780e47070fd091b

Is it possible?

eric_pesty

The axes on the bogie and servo horn are not parallel so that's why you are running into trouble. But you can make it work by using a ball mate at one end and a cylindrical at the other end like this for example:
https://cad.onshape.com/documents/7e3e8c7cb09119281bc5f18d/w/7c888edcded7f862a14cce44/e/4aa37ffedd82f84b7f804f6e

james_sleeman

Perfect, never thought to try a ball mate!