Fisher Price Motor Into Drill Gearbox

[David Bridge]

Originally Posted by JVN

ah HA!
I KNEW it was 177, but my collegues told me I was mistaken.

Do you have any more info about how you guys did this?

Thanks,
John

Well I can tell you that after switching the gears we bored out an alluminum tube so that it had the same id as the motor and the same od as the transmission, then I made little rectangular piece out of 1/8 all. and drilled a hole in the center for the little nub on the back of the motor and to little holes which were then tapped which lined up with the holes in the back of the motor finally there were two holes drilled on either end to put threaded rod through. Next I made and all. support that slipped over the transmission with holes for the threaded rod and that was how we locked the motor into the transmission and kept it from free spinning... As far as I know the process wasnt really that complicated. The hardest part is when you are screwing the plate into the back of the motor you can only get a couple of threads in without going to far and stalling/smoking the motor (Design credit goes to Dzdconfusd... PM him if you have any more questions)

[Xufer]

hmm i wish i would have known about that at UTC or nationals heh i was talking about doing that beofre this season but my team just kept brushing it off, i hope you guys intend to go to the bash at the beach in the fall so that i can take a look at it, i would love to see it, (even in picture form) im always toying with drive train ideas especially after this year where my drive train left much to be desired, we had no torque at all. but we could get to mid field in under 3 seconds which wasnt much help when we were pushed right back to our starting position.
Just out of curiosity did you have any problem with the clutch slipping on the planetary gear box i know last year we did (driving me from drills this year) and when i stopped by 250's booth at nationals they were having problems with it staying up even when wired in place.

[David Bridge]

I believe that in the final version of the winch the clutches had been removed in favor of a dynamic electric break... I do believe that they were giving us trouble when we ran with them in our first attempts at nationals because the clutches had not been removed in that pair yet (i could be mistaken)

[JVN]

Originally Posted by David Bridge

Well I can tell you that after switching the gears...

This is what I'm most interested in.

I do not have the motors in front of me. Are the actual output shafts the same size? Did you just pop the Mod7 off the drill, and throw it on the FP, or did you use a different gear? Is there any voodoo involved?

I know there have been several threads about press fitting gears onto/off of these motor shafts, which method did you use? Anything fancy?

Thanks -- We're already learning new tricks for next year,
John

[Xufer]

yea if you guys had some pictures of those gear boxes with the modifications i would love to see them. I was lookign for a way to end that little slippage problem, becuase i am looking to use the drills for next year.

[sanddrag]

Originally Posted by JVN

This is what I'm most interested in.

I do not have the motors in front of me. Are the actual output shafts the same size? Did you just pop the Mod7 off the drill, and throw it on the FP, or did you use a different gear? Is there any voodoo involved?

John

I was recently interested in this myself. The drill pinion bore measures ~5.0mm and the FP ~.124" (from firstcadlibrary inventor files). So, you can bore out the FP gear to put on the drill but you'd have to do something really special to put the drill gear on the FP. Maybe weld it up and bore it out or press in a solid piece (tight), bore it out, then press it on the motor. I have never pressed a gear on a motor so I don't know that much about it. I do know the Tecknokats have done this a bit so you might ask Andy Baker.