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Originally Posted by eddwahd
As much as i would like to purchase a pre-made gear box from andymark /=,
i really want to do my own gear box for my fisher price motor.
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OK, fair enough. Here is some advice:
Look inside of the Bosch gearbox from last year (or previous years), and you will find all of the gears you need to build your very own single-stage reduction gearbox. The ring gears, planet gears, and pin-plate that holds the planet gears are all in there. Unfortuneately, the sun gear (pinion) has a larger id (5mm), as the Bosch shaft was bigger than the F-P motor shaft.
These are the parts used on the TechnoKats last year to make our own Fisher-Price gearbox. We had to fabricate a housing, an output shaft that mated up with the pin-plate, and a new 15-tooth gear (we used 36dp). We used an 8mm id needle bearing to support the output shaft. This bearing failed during our summer competition (after 3 competitions of qualifying and elimination rounds), so Mark and I simply added a second bearing in our AndyMark design.
Good luck,
Andy B.