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#1
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window motor spec sheet confusion
I'm designing the final stage of the articulation of our arm and we have choosen to use the window motor
<http://www2.usfirst.org/2004comp/Specs/Nippon-Denso_Window_Motor_specs.doc> However, where the sheet mentions the specs for the output gear, they list 12-14 as the diamatral pitch. Why are there two pitches??? Which one should we use when we order gears to mesh with that gear? Have any teams used one/or the other with any success? Are we allowed to remove the output plate and press on our own gear? Thank you in advance! Good luck this year! -Andy |
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#2
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Re: window motor spec sheet confusion
I'd suggest using the coupler that came in the kit or making one of your own. Here's a drawing of the coupler we made last year. We also made a similar coupler in 2002. Let me know if you have any questions.
-Joel |
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#3
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Re: window motor spec sheet confusion
Quote:
As far as removing the plate and pressing on a new one, I'm pretty sure that that is explicity disallowed by rule R62. |
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#4
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Re: window motor spec sheet confusion
Here is something that adds to the confusion: The spec says it has a pitch diameter of 20.2184mm. This equates to .796 in. So if you do the standard calc for gears (NT/ PD = DP) you get: 9 / .796 = 11.3 Diametral Pitch! Huh!
So, what is going on here. I guess we should ignore the 20.2184 number? |
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#5
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Re: window motor spec sheet confusion
We, unfortunately do not have the capebilities to make our own gears...
However I found a supplier for 12 and 14 pitch gears, Ohio Gear, I think. We were gonna try one of the 12 pitch gears and see if it works. Since they are stub tooth gears, do you think we could turn a twelve pitch gear down so the teeth are shorter? Is that possible without distroying the teeth? Thanks again! -Andy |
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#6
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Re: window motor spec sheet confusion
Years ago they supplied the whole window drive assembly in the kit; this motor attaches to a hard plastic coupling that drives a flexible plastic tape through a track. It doesn't have much horsepower so I wouldn't worry about bending stresses or contact stresses with a metal gear. You can turn down the teeth; you're changing the tooth profile but it wouldn't match this gear anyway. One suggestion - if you use a brass gear, the brass will "self-work" to the appropriate profile somewhat (we've used this method meshing to the small pinions on the other motors in our drive trains for years).
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#7
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Re: window motor spec sheet confusion
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Usually, gear prints show the generating specifications, but I have know several companies to put the operating specifications on their prints (helicopter transmissions, for example, are sometimes specified this way). So, unless anyone can come up with further evidence, I would ignore that pitch diameter... |
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