Calculating Gear Ratios - Need Assistance?

[willib]

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??

 

[Cyrus]

What are these numbers, diameters, radius, number of teeth?

 

[willib]

they are number of teeth.

 

[Cyrus]

Do you want to know what's the end torque? Because without radii, I can't 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?

 

[willib]

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