Turning can be difficult with threads if you dont do 1 or 2 things…
On the bottom of our robots we had a idlers that the chain ran against and these idlers had a slight “curve” to them…
Never had any problems with this design of tread…
http://www.theforumisdown.com/uploadfiles/050102/robot.jpg
The optical sensor was part of the “Traction Control” we had that we never used…
*Originally posted by Clark Gilbert *
**The optical sensor was part of the “Traction Control” we had that we never used… **
Oh well, it was a learning experiance 
We experimented with cleats this year. We built some prototype wheels and even a test jig with spring scales for testing traction. We ultimately settled on the cleated design you see in the picture. The wheels are 3 layers of 1/2" plywood with 1/2" C-channel aluminum for the cleats. They were definitely above average on traction but not as good as those beast machines. We could easily be pushed around sideways. We will probably try something else next year.
Our wheels:
*Originally posted by Clark Gilbert *
**The optical sensor was part of the “Traction Control” we had that we never used… **
Not true
it was used a little bit, then the wire for the sensor was ripped, after it was repaired we used it once more and then it was turned off…
Hey did anyone see team 25’s wheels
we had wheels w/ a 9in dia. and 4in wide we then
ground them flat and cut a criss cross pattern
our sponors called them carpet meshers (thats what they did)
AND REMEMBER IF IT AIN’T F.I.R.S.T WATER IT AIN’T WATER