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Unread 17-05-2013, 22:08
Andrew Lawrence
 
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Re: Ball Shifter vs other gearbox

Quote:
Originally Posted by Priyesh69 View Post
Just to confirm getting the second stage(high gear) with a 3.667:1 ratio will get us to roll at a speed of 14 fps if the weight of the robot is 115 lbs. Can someone link the website where to buy the mentioned encoder.
For the most part, weight won't affect your top speed (it would affect how quickly you can accelerate to that speed, but not the top speed itself). What matters is the motors used, the gear ratio between the motors and the wheels, and the wheel diameter.

Also, if you're looking for a way to get around defense, while shifting helps, a 115 lb robot may have trouble pushing a 120+ lb robot. If you want to get around defense, I'd suggest clean and quick driving and evasive maneuvers. Just drive around them. If you want that extra oomph, you can shift, or make a 6-CIM drive (if it's legal next year). A 6-CIM drive will allow you to accelerate quickly enough to speed around defenders even at a decently high speed, plus gives you a bit more torque for pushing (note: Most 6-CIM drives will not give you more torque than a shifting transmission, but sometimes you don't need it).
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