Quote:
Originally Posted by nick1023
1. What is the gear reduction of the Kit of Parts Fisher Price gearbox.
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Count the number of teeth on each gear, and calculate each stage's ratio as a ratio of tooth count. For example, if the first gear has 25 teeth and the second gear has 75 teeth, the ratio is 25:75, or 1:3. Three turns of the first gear results in 1 turn of the second gear. If on the second gear there is a third gear of 30 teeth, meshing with a 4th gear of 70 teeth, the ratio is 30:70, or 3:7. If you go from the first gear to the 4th gear, the ratio is 3:21 (=1:7), where 7 turns of the first gear results in 1 turn of the 4th gear.