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Originally Posted by Carlo
With a multi-speed transmission, we're having a slight problem moving our robot. Unless it is in its lowest gear, (Approximately a 15:1), the robot will not move. Our second gear is a 5:1 ratio, and will not move the robot one bit.
Our wheels are approximately 2.5 inches in diameter. It's bothering me to no end that this robot will not run in this gear.
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I find that strange also. Last year through a snafu, we managed to get a fixed 4:1 ratio to our wheel on our bot, and we were using the large skyway pneumaic tires. The bot ran decent too, just heated the the motors really quickly. But, we did only have an 85 pound robot so your results may vary. What kind of drivetrain are you using? We were using mid-wheel 2wd design with castors in each corner. I would think that with only 2.5" dia wheels, 1:5 should move your bot.