Motor Pinions

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Posted by James Jones.

Engineer on team #267, The Demolition Squad, from North Broward & St Andrews and Motorola.

Posted on 1/17/2000 11:07 AM MST



Does anyone have the data on the FP, Drill and Globe motor pinions? i.e. pitch, pitch diameter, pressure angle etc?

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Posted by Joe Johnson.   [PICTURE: SAME | NEW | HELP]


Engineer on team #47, Chief Delphi, from Pontiac Central High School and Delphi Automotive Systems.

Posted on 1/17/2000 12:57 PM MST


In Reply to: Motor Pinions posted by James Jones on 1/17/2000 11:07 AM MST:



The drill pinion is a 0.7 Module gear (module=mm of diameter per tooth) with 12 teeth (not easy to find module, PIC Design has some, Stock Drive Products has some plastic (yuck!) .7 module gears for sale).

The Fisher-Price is a 32 D.P. gear (diametral pitch=number of teeth per inch of diameter) with 16 teeth.

Both gears are not exactly standard gears but are close enough to run with standard gears (in my experience).

As to the Globe, I have never taken one apart. In my opinion, this is the most robust of the three transmisions discussed and I would not mess with it if I were you. The only thing that I do recommend is that you support the end of the shaft as side loads will not only reduce life, but will also reduce output.

Good luck.

Joe J.

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Posted by James Jones.

Engineer on team #267, The Demolition Squad, from North Broward & St Andrews and Motorola.

Posted on 1/17/2000 1:42 PM MST


In Reply to: pinions posted by Joe Johnson on 1/17/2000 12:57 PM MST:



what pressure angle on the FP's? 20 deg.?

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Posted by Joe Johnson.   [PICTURE: SAME | NEW | HELP]


Engineer on team #47, Chief Delphi, from Pontiac Central High School and Delphi Automotive Systems.

Posted on 1/17/2000 6:28 PM MST


In Reply to: Re: pinions posted by James Jones on 1/17/2000 1:42 PM MST:



VERY IMPORTANT:

All the gears I am aware of in the kit use a 20 degree pressure angle.

This is very important. A 14 1/2 degree pressure angle gear and a 20 degree pressure angle gear do not like eachother and will not be happy working with eachother.

Joe J.

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Posted by Korey Kline.

Engineer on team #59, Ramtech , from Miami Coral Park / Carrollton and Syntheon / eAc / FIU.

Posted on 1/21/2000 3:47 PM MST


In Reply to: pinions posted by Joe Johnson on 1/17/2000 12:57 PM MST:



Does anyone know the pitch and pressure angle for the seat rack & pinion assembly? It looks like the window motor has the same pitch ect. as the seat assy. Is this correct?

Thanx K2

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Posted by Joe Johnson.   [PICTURE: SAME | NEW | HELP]


Engineer on team #47, Chief Delphi, from Pontiac Central High School and Delphi Automotive Systems.

Posted on 1/22/2000 8:33 AM MST


In Reply to: Re: Rack & Pinions posted by Korey Kline on 1/21/2000 3:47 PM MST:



I looked this up back when those parts were part of Delphi (when I got them donated by Delphi -- we have since sold our seat business to Lear).

It has been a long time, BUT... I am 95% sure that the following is correct:

Pressure angle: 20 Degrees
Diametral Pitch: 16 Teeth per inch of diameter
'Stub' tooth -- not Full Depth (Stub: addendum = 0.8/D.P. dedendum = 1/D.P)

I don't think the 12 tooth pinion on the window motor is 'enlarged' to reduce undercut, but I am almost positive the smaller pinion on the seat mechanism IS enlarged -- as a practical matter this means that you will have to increase the center distance somewhat from the theoretical nominal dimension.

Good Luck.

Joe J.

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Posted by Steve Shade.

Other on team #7, Wizzards, from Parkville High School and Black & Decker / AAI / Raytheon.

Posted on 1/23/2000 11:10 AM MST


In Reply to: Re: Rack & Pinions posted by Korey Kline on 1/21/2000 3:47 PM MST:



: Does anyone know the pitch and pressure angle for the seat rack & pinion assembly? It looks like the window motor has the same pitch ect. as the seat assy. Is this correct?

: Thanx K2


Last year we had an bad CG problam. Luckilly we were able to put a stabilization wheel on the back and use it to our advantage by being able to get our front wheels on the puck, jacking up using the seat system and then driving on. We were able to use the window motor with an extended mounting bracket to speed up the otherwise slow seat unit.

Steve