Fisher Price Gear Box Problem

[joeweber]

We were able to remove the largest gear of the fisher price gear box and than attached a 2 inch aluminum pully to the next gear set down. We than ran a belt to a 3/4 PVC pipe and it works great.

[kevinbrice]

Can you please post more pictures from your modified gear box...we are interested. Also it powers dual 2 inch delrin rollers which are the last pulley as well.

[Akash Rastogi]

Originally Posted by joeweber

We were able to remove the largest gear of the fisher price gear box and than attached a 2 inch aluminum pully to the next gear set down. We than ran a belt to a 3/4 PVC pipe and it works great.

Joe was it similar to this? (hope the picture shows up)

http://www.facebook.com/photo.php?pi...5&id=645471640

[dtengineering]

We're using a banebots 26:1 planetary gearbox running off an FP to a 2" diameter roller with roughtop tread on it. It might be just a touch slow... we're going to work with it on our practice robot to try and optimize it.

When the ball is in "full backspin", we draw about 3-4 amps on the FP... which doesn't drop all that much when there is no ball in the system, so I'd have to say that the force requirements to put backspin on the ball (at least in our stationary testing application) are fairly minimal relative to the gearing and frictional losses.

I hope that provides some useful comparison data. Good luck getting it up and running smoothly. Hooray for the witholding limit!

Jason

[joeweber]

Originally Posted by Akash Rastogi

Joe was it similar to this? (hope the picture shows up)

http://www.facebook.com/photo.php?pi...5&id=645471640

Yes. We used the same gear shown but slide the small gear in that set into a 2 in pully. We than cut out the gear box to allow it all to fit. I will not have other pictures until we unbag it. You can dig through our build pictures if you like http://www.team1322.org/robotics_09-10.htm

[kevinbrice]

very cool. we are trying that right now. I will post back if it works!

[jspatz1]

Originally Posted by joeweber

We were able to remove the largest gear of the fisher price gear box and than attached a 2 inch aluminum pully to the next gear set down. We than ran a belt to a 3/4 PVC pipe and it works great.

We made a similar modification to run our roller. Cut the FP gearbox case in half, removed the last two gears, attached a 1" timing pulley to the 2nd gear. I believe the result runs about 400 rpm. Sorry, no pictures of this before we bagged it.

[Al Skierkiewicz]

Just so everyone keeps this one thing in mind. The FP motor has an internal thermal cutout. When it opens, there is a 2-4 second delay before the motor comes back to life. Just be aware when it occurs.