[EricH]

Originally Posted by M. Gildner

What is the RPM of the Fisher Price gearbox using the FP motor.
I have the rpm of the motor, but cant find it for the gearbox and i dont know how to figure it out. Any numbers or suggestions on where to look are welcome.

Thanks for your time and help

2620

This has been discussed recently, but here's the "simple" way: figure out the reduction of the gearbox.

Let's say, as an example, that you have a motor that turns at 10,000 RPM and you have a 2:1 gearbox. This means that for every 2 turns of the input gear, the output gear turns once. Your output RPM is 5,000.

Now, a stock FP gearbox is about a 124:1 reduction. So, for every 124 turns going in, 1 turn comes out.

If you want to check the numbers, you can always open up the gearbox and count teeth. This will give the ratios for each set. Multiply to get the final. (This due to the fact that every gearset affects the next one down.)