Answer / deependra singh parihar

The Speed Ratio for any given gear box is Calculated by
following relation

T1/T2 =N2/N1

so Speed of Driven or Follower gear will be

N2 = (T1/T2)*N1

Answer / ramesh yerabolu

The speed of the gear box or no : of teeths of gears can be
calcullated by N1/N2=T2/T1. If you know three valves we can
find out the forth one.

Normally the GB ratio is mentioned in 5 :1,10:1 like.
Ex : GB ratio is 30 : 1 that means 30 revalutions of worm
shaft is equal to 1 revalution of worm wheel.

Answer / mech09138

it is the ration of pinion speed/gear speed

Answer / bharat

There is two types. .....
1 . Gear box
2 . Gear ratio.

For gearbox ratio you should know input rpm or torque and out put rpm or torque.

T1 / T2 = N2 / N1.

T1 = No. Of teeth on driven
T2 = No of teeth on driver
N2 = o/p rpm
N1 = I/p rpm

For finding gear ratio...

Ratio = T1 / T2.

Answer / v.vinoth

n = (NS2-NS1)/(NS2+NR)

Answer / unemployed

n2=t1/t2*n1 but with friction i.e
n2=t1/t2*n1+0

Answer / shubankar sen

3:1

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