My robot would have 4 wheels with the rear two wheels differential driven (powered by motors).
I need 4 wheels because it would be driven on a road condition, so I 'd need the stability.
1) How well would this work ? Would the front two wheels provide a lot of turning difficulty ?
2) How do I make (or mount) the front wheels free turning (idler wheels)? I can't seem to find a long rod of 3mm diameter to connect the two wheels. Any ideas ?
Thanks a lot!