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urmyboyblue · 11-19-2017, 10:47 AM

Gear pitch (teeth per linear inch of gear) has to do with power transmission. The greater the pitch, the larger the tooth and the more power that can be transmitted. Gear pitch has nothing to do with gear reduction- that is the result of pitch diameters of gears. If gear A has a pitch diameter of 12" and gear B has a pitch diameter of 2", the ratio is 6:1 (A:B). So every time A rotates, B rotates 6 times. Changing the gear pitch of gear B while keeping the pitch diameter the same has no effect on ratio, but it means the teeth won't mesh right. IF you can get them to work together, they will eat each other up quickly.

With two gears of the same pitch, the number of teeth on each gear is directly proportional to the pitch diameter (via the gear pitch). So you can divide the number of teeth on one gear by the number of teeth on the other gear and find the gear ratio. BUT this only works if both have the same gear pitch.

It seems like JC Whitney used to sell a universal bolt on kit for power windows in a car with manual windows. It had a coupler on the lift motor shaft that attached to the stem that the window crank normally attaches to. Don't know if they still make it. The motor mounted to the door panel.

11-19-2017, 10:47 AM	#15
urmyboyblue Registered User Join Date: Feb 2015 Location: Montevallo, AL Posts: 272	Re: Power Window Project DIY 64-66 TRUCK Gear pitch (teeth per linear inch of gear) has to do with power transmission. The greater the pitch, the larger the tooth and the more power that can be transmitted. Gear pitch has nothing to do with gear reduction- that is the result of pitch diameters of gears. If gear A has a pitch diameter of 12" and gear B has a pitch diameter of 2", the ratio is 6:1 (A:B). So every time A rotates, B rotates 6 times. Changing the gear pitch of gear B while keeping the pitch diameter the same has no effect on ratio, but it means the teeth won't mesh right. IF you can get them to work together, they will eat each other up quickly. With two gears of the same pitch, the number of teeth on each gear is directly proportional to the pitch diameter (via the gear pitch). So you can divide the number of teeth on one gear by the number of teeth on the other gear and find the gear ratio. BUT this only works if both have the same gear pitch. It seems like JC Whitney used to sell a universal bolt on kit for power windows in a car with manual windows. It had a coupler on the lift motor shaft that attached to the stem that the window crank normally attaches to. Don't know if they still make it. The motor mounted to the door panel.