# Gear ratio ?

Hi , is anyone studying gear ratios??
i need some help with calculating the final gear drive..
i've calculated it at 94.97:1
is this correct??

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• gears.GIF
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What are these numbers, diameters, radius, number of teeth?

they are number of teeth.

Do you want to know whats the end torque? Because without radii, I cant tell you.

FredGarvin
Follow the train through logically. Starting at the motor:
Gear 1 to 2: The speed will step down by a factor of 6/43.

Gear 2 to 3: The speed should stay the same since they are on the same shaft, so it's ratio could be 1/1

Gear 3 to 4: The speed is reduced again by a factor of 12/40.

Gear 4 to 5: Again, they are on the same shaft so the ratio should be 1/1.

Gear 5 to 6: There is another reduction in speed by a factor of 12/39.

Gear 6 to 7: Same shaft, no change, 1/1.

Gear 7 to 8: A final reduction in speed of 12/39.

So where does that leave you?

94.62 : 1 thanks fred ..
how did ya know it was a motor