I have a base with 4 wheels, the rear axle is a motor which drives the base forward or backwards, this contains a diff, so there's no problem there.
The front axle is a steering axle like that in a car, except where the steering column would be extends vertically, and not at a diagonal in a car.
In spare parts, I have an arm which is capable of pushing and pulling (depending on which way the DC current goes), and this is affixed to a plate at the rear of the wheel base, and points at 90 degree angle from the plate, towards the steering column. The arm is affixed 20cm to the left of the steering column. I want to use this arm to turn the steering axle.
If I fit another (fixed, non extending) arm onto the steering axle so it can be pushed and pulled, what could I do to connect the two arms so that the extending arm can turn the steering axle? Would the non extending arm also need to be extendable (like a piston)?
Below is a very poorly drawn diagram that I've rushed a bit. The yellow section is the extending arm, the blue bar is the bit for steering. The black bar that extends from the blue bar is the steering column (with the proposed fixed arm pointing left)