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__Dilemma:__

So the problem right now is that I'm trying to use a gear reduction system to get the most out of some small electrical motors (those of an NXT robot) and I'd like to be able to calculate the amount of weight that can be pulled upward if I know everything about the gears and motor(s) hooked to the gear reduction system. Any ideas as to how I could calculate this?

__Thoughts:__

I imagine that given W=FD and P=W/T that I could possibly use these two formulas as well as the rpms of the motor and the size of the gears to go backwards and mathematically calculate weight? Just a thought though. I've been thinking through a half dozen designs all day so as I write this I'm fried lol, please forgive this post if it comes out half thought through.

Oh p.s. heres a link showing a lot of thorough graphs for rpm(s), torque vs. mechanical power, etc. http://www.philohome.com/nxtmotor/nxtmotor.htm

Thank you in advance if you even look at this lol