Gears

[Thunder360]

Hey guys Im puting together some Idea's about next years drive train, and I dont have a clue how fast our bot would go with my current set up. So if somone would be nice enough to run these #'s and tell me about how fast we will be going that would rule. We are prolly going to run a Chippy with a 10 tooth gear, then to a 20 tooth gear, on tht same shaft we will have a 10 tooth going to a 25 tooth. On that shaft we will also have a 10 tooth gear going to a 60 tooth gear connected to 2 wheels. So it will be 4WD when both sides are put in, so ya some #'s like speed would be nice, if you have and more questions I can E mail you the lay-out I made.

[rbayer]

What wheel size were you thinking of using? It looks to me like your final gear ratio will be 1:30 with somewhere in the vicinity of 75-85% efficiency (assuming 92-95% per stage). So, given the ~4500rpms of the chips under normal load, you're looking at around 2 rotations per second on your wheels. Multiply this by your circumference and you'll have a rough estimate of your speed. Assuming 6" wheels, that comes out to around 3fps. While this is very slow, you would have a lot of torque. On the other hand, bigger wheels would result in faster speeds (at the cost of torque) while smaller ones would result in even slower speeds.

[Thunder360]

thanks that really helps, we were looking at either usind the Skyway Tuff wheels or the big honking wheels that were used 2 years ago, prolly will stick with the Skyway's. Thanks again