D&T Online: Mechanisms information

`Mechanisms: Gear Ratios`
	`The velocity ratio of two adjacent cogs can be calculated by dividing the number of teeth on the driven gear by the number of teeth on the driving gear. The velocity ratio of a compound gear train is calculated by multiplying the velocity ratios for all pairs of meshing gears. For example, if the driving gear has 60 teeth and the driven gear has 20 teeth, then the velocity ratio is 20/60 = 1/3`