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RPM doesn't correlate with torque as with cars. Here the "stall-torque" is the maximum torque output under "stall" conditions where the motor's shaft is stopped. This is because with electric motors, peak torque occurs at 0 RPM, and decreases as RPM increases. RPM readings are usually for "no-load" conditions. So if what you need is X torque at Y RPM, you will need a motor with much greater than Y no load RPM and much greater than X stall-torque, since the motors torque and RPM ratings are for their respective ideal conditions (motor being stalled, vs at no load). For some motors, you can find a datasheet that shows torque vs RPM plots, but with frictional losses from the gearbox, you probably need to get a slightly overpowered motor to be safe. Also, you don't want to build your own gearbox as it is a lot of trouble. Try www.banebots.com for some of their gearmotors, which come with prebuilt gearboxes for a wide range of gear ratios.What is this motor going to be used for?
The RMF calculator looks neat, but I am not sure how I can adapt it to the usage I am looking for.