Go to Post I find this ironic. In English class our teacher's tell us how there is symbolism and such, and we don't understand it or think its there. Then FIRSTer's get a Game Hit, and we think EVERYTHING is a symbol and has some significance. - akoscielski3 [more]
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Unread 12-01-2005, 12:02
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Re: White Paper Discuss: Nothing But Dewalts

Can someone explain the purpose of the plastic "top hat" for the CIM modification? Is it some sort of bushing to support the shaft? Is it absolutely neccesary? Do the screws holding it to the carrier gear actually need to transfer much torque, or is it just to press it up to the gear?
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Unread 12-01-2005, 12:40
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Re: White Paper Discuss: Nothing But Dewalts

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Originally Posted by Max Lobovsky
Can someone explain the purpose of the plastic "top hat" for the CIM modification? Is it some sort of bushing to support the shaft? Is it absolutely neccesary? Do the screws holding it to the carrier gear actually need to transfer much torque, or is it just to press it up to the gear?
The sole purpose of the tophat is to keep the shifting ring from the second gear stage of the Dewalt transmisssion (which, just for clarity sake, becomes the first stage of the gearbox on the Chiaphua design because the normal first stage is eliminated) from tilting out of alignment.

Normally, the ring from the first gear stage keeps this second ring from tilting, but with the entire first gear stage removed, there is nothing but air to do this.

As to torque, there is no torque needed at all. In fact, there is no reason to have more than 2 screws. We just used 4 because there were four planets on gear stage one, which suggested to us to use 4 screws. Absolutle overkill.

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Re: White Paper Discuss: Nothing But Dewalts

Alright, so there is no reason to even widen those holes (hardened steel isn't so fun to machine). Just find some small enough screws or other fastener.
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Re: White Paper Discuss: Nothing But Dewalts

Quote:
Originally Posted by Max Lobovsky
Alright, so there is no reason to even widen those holes (hardened steel isn't so fun to machine). Just find some small enough screws or other fastener.
In actual fact there is no reason that the part can't be held in place by a shaft spacer. I never really thought about it, but you could just buy this part (6436K132) from McMaster.com and us that to keep the plastic tophat from backing off from the gear you press on the Chiaphua shaft.

In fact, if you could find a washer with at 5/16 hole and 1.650 or so OD, you could probably eliminate the tophat entirely (together with the above and a standard 5/16 washer)

Good thinking.

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