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#16
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Re: Fisher Price Gearbox
Good posts, thank you all for the ideas.
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#17
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Re: Fisher Price Gearbox
If you're in the business of manually making an octagon without precision tools, here's what I'd recommend: Draw it in CAD, mark the center in CAD, print it out 1:1, cut it out, use 3M spray adhesive on your material, stick your drawing to it, get a cuttin!
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#18
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Re: Fisher Price Gearbox
Quick question: I've found 2 sources of data for the gear ratio of this gearbox. One says it's 124:1, the other says it's 188:1.
Can anyone confirm? |
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#19
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Re: Fisher Price Gearbox
For the teams that have driven arms with the FP through the gearbox, have you run into any issues with heat? Specifically when you are holding the arm at a set position (up in the air). I know the FPs are cooled by fan blades that spin when the motor spins, so it seems to me that heat may be a problem when the motor is exerting torque but not spinning.
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#20
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Re: Fisher Price Gearbox
http://store.mendingshed.com/wheeldriver1.html
I'm not totally sure that this is the exact coupler used by these motors, but my team ordered two of them (they're only $4 a piece) to see if we can make the FP gearbox outputs a little more useful. Cheers! |
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#21
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Re: Fisher Price Gearbox
We have used the plastic couplers several years and they work well. An easy way to connect the coupler to a keyed shaft is to buy a 4" V belt pulley and cut half of the pulley off leaving a 4" round flange with a nice keyed shaft coupler. Drill 4 matching holes in the pulley flange and the plastic coupling, add screws, drill out the plastic coupling to 1/2", put it all on a 1/2" keyed shaft and you have a connection that will not fail.
We will be doing this next week for this year's robot. |
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#22
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Re: Fisher Price Gearbox
Quote:
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#23
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Re: Fisher Price Gearbox
Quote:
![]() BTW, can we check those sources? |
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#24
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Re: Fisher Price Gearbox
Source 1: JVN's Spreadsheet calculations -- some of the spec #'s are from previous years and do not apply to 2008, so that's the only reason I question it
Source 2: FIRSTWiki |
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