Go to Post Since our team is in possession of the school, we have no restrictions on how late we can be there. So our teams are often practicing into the wee hours of the morning. Also, the school board uses "the breeze" for storage of high jump mats, so it's a great place to nap. :) - Karthik [more]
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View Poll Results: What's most important in this year's game?
Strength/Power 11 16.67%
Speed/Maneuverability 25 37.88%
A happy medium of both 30 45.45%
Voters: 66. You may not vote on this poll

 
 
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Unread 10-01-2005, 08:01
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Tristan Lall Tristan Lall is offline
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Re: 2005 Drivetrains

Quote:
Originally Posted by Greg Needel
this is not possible because you wont have the traction to transfer that force to the floor.... kinetic force = (coefficient of friction)*(the normal force)

since the coefficient of friction can;t be more then 1 and your normal force is essentially the weight of your robot (force that acts perpendicular to the surface)

therefore your max force can not reach 340 ft-lbs


i would recommend recalculating your theoretical force to a more reasonable value around the max weight of your robot but even that will be overkill and you will just end up spinning your tires
Greg, you're right about the wheel slip being the limiting factor, but with interlocking surfaces or certain combinations of materials, μ can exceed 1; it's a convenient approximate upper bound, but it isn't a physical limit. (See here.) Some FIRST teams have empirically determined the coefficient of friction of rubber tread on carpet to be around 1.2; it all depends on your particular wheels.
 


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