Sorry, I didn't make myself clear.
Instead of a rack, you can use an open timing belt stretched and held at both ends.
The timing belt is looped over a pulley wheel that is driven by a motor.
The motor turns the pulley and the motor moves because the belt is held at both ends.
Very easy to build and minimal precision required for manufacturing.
Andy
__________________
Drat, imperfection has finally stopped working!! |