Co-Authored By:

Divide one teeth count by the other.

Now that you know how many teeth are oneach**gear**, you can find the

**gear ratio**relativelysimply.Divide the driven

**gear**teeth by the drive

**gear**teeth.Depending on your assignment, you may write your answer asadecimal, a fraction, or in

**ratio**form (i.e., x:y).

Then, how do you calculate first gear ratio?

**First**, divide the number of teeth of thedriven**gear** (n=30) by the number of teeth of the driver**gear**(n=7). This will result in a **ratio** of 4.285or4.3:1.

**Calculating**the

**SprocketRatio**The

**sprocket ratio**is simply the number ofteethon the driving

**sprocket**(T

_{1}) divided bythenumber of teeth on the driven

**sprocket**(T

_{2}).Ifthe front

**sprocket**on a bicycle has 20 teeth and therear

**sprocket**has 80, the

**sprocket ratio**is 20/80 =1/4 =1:4 or simply 4.

Regarding this, what is the transmission ratio?

The **transmission ratio** is defined asthe**ratio** of the angular velocities or frequencies ofrotationof the components. The **transmission ratio** of geardrivesconnected in series is equal to the product of the**transmissionratios** of these drives.

**There are three major categories of gears in accordancewiththe orientation of their axes**

- Parallel Axes / Spur Gear, Helical Gear, Gear Rack,InternalGear.
- Intersecting Axes / Miter Gear, Straight Bevel Gear,SpiralBevel Gear.
- Nonparallel, Nonintersecting Axes / Screw Gear, Worm, WormGear(Worm Wheel)