mattallen37 wrote:Tracks often do introduce more friction than wheels, but are often easier to design for. With tracks, you can easily make a skid-steer, and all motor power can go to driving the tracks (you don't need to waste resources for a steering motor). Wheels often have a large diameter, making them harder to drive (you need torque, which means more tolerance issues).
Tracks can be the best option, but it depends on the surface you will be driving on, and the tracks/wheels/design you have.
mightor wrote:At my robotics club we have competitions and the robots with the tracks often find themselves unable to make a pivot turn on the rubber mats due to the friction. I've seen tracks split or just come off the little wheels. Keep that in mind
mightor wrote:If the mat provides too much grip, the tracks have trouble turning the robot on the spot. There is too much friction and you end up either running the track off the cogs or, worse, snapping them. I've seen it happen.
h-g-t wrote:Interesting experiment on traction here - http://www.philohome.com/traction/traction.htm
marcoloca wrote:Another thing, do you think we'd better connect all the three "circles" (it's not the right term, I now) to the same motor, or is better to make move only one circle? And if yes, which of the three (anterior, posterior or middle-high)?
hassenplug wrote:The circles are wheel hubs.
Personally, I wouldn't power all three hubs. As long as one hub is turning the track, two or three won't make it turn "more", and adding gearing to connect all three may add friction, which would not be good.
I would connect the motor to the middle hub to give it good ground clearance, but only if the track goes around 90 degrees of the hub. Less than that, and it may slip.
mattallen37 wrote:You don't want the tracks too tight. Whether you are using the track links or rubber tracks, you want some slop in them (but not enough to make them slip or come off).
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