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So my question is, what are some simple methods of gearing this motor down slightly and getting the pseudo-linear motion required to turn the steering bar. Currently I'm considering something along the lines of a lever with a pivot point near the front with a short distance to the bar, and a longer lever arm in the back with a wide travel distance, somehow hooked up by wire or string to the motor.
Any additional ideas or help would be greatly appreciated, thanks!
You could use an aluminium Vee pulley, of a small diameter, say around 20/25mm, mounted directly onto the output shaft, wind kite line/wire fishing leader/etc around it five/six times, pull tight and attach to both ends of the steering tie rod!
If you want to make an Ackermann steering, the two rods connecting the wheels to the steering bar should be made to point towards the midpoint of all 4 wheels, for a smooth steering.They seem parallel to me and that won't give the right steering profile.