Gearing for 12 (fps)

Originally Posted by Chris is me

I would suggest a bit more conservative than 12 if you have intentions of occasional defense with a high traction drive. We're running a much more conservative 9 (standard TB to 6" wheels after friction losses) primarily because of the balance.

We're not planning on any robot-on-robot defense, however we play more of an indirect defense. And when we are robot-on-robot, we have a specific area and position to play from, which will greatly assist our allies, and hinder the opposing team. No more info on that, though.

[Hawiian Cadder]

I would say that gearing fast is not particularly a problem. In straight pushing matches gearing fast will just result in a stall out, even if the other robot is geared much much slower, they wont really back-drive your motors, and as long as you have grip nothing really happens. Our 2011 robot was geared 14.4 ft/s and was able to play effective defense because it had slightly better acceleration than a standard AM shifter drive-train and it could just stay in the way. Even against teams with lower gear ratios such as 5 or 6 ft/s any direct pushing match usually just ended in a stall out because we had enough grip and back-driving motors is incredibly difficult.

TLDR; Grip is more important than gear ratio as far as pushing matches go.

[AllenGregoryIV]

Check out JVN's Design Calculator. It hasn't been updated with 2012 motor data but it is still one of the best resources for drive train calulations. You should be able to check what your top speed was on your robot from last year by putting in all the numbers.

Also here are the updated motor specs for this year (as of 1/16/2012).

For what's it's worth we're gearing for around 10-11ftps this year.

Originally Posted by AllenGregoryIV

Check out JVN's Design Calculator. It hasn't been updated with 2012 motor data but it is still one of the best resources for drive train calulations. You should be able to check what your top speed was on your robot from last year by putting in all the numbers.

Also here are the updated motor specs for this year (as of 1/16/2012).

For what's it's worth we're gearing for around 10-11ftps this year.

thanks. We've been using JVN's Design Calculator.

[Ether]

Originally Posted by AllenGregoryIV

Also here are the updated motor specs for this year (as of 1/16/2012).

Still no specs for the Fisher-Price FP-000968-9013.

Does anyone have data or manufacturer specs for the FP-9013??

[JamesCH95]

My gut says 12ft/s is fine.

We're gearing for 5.5/14.5ft/s