Gears, which have a long history, are cylindrical wheels that are used to transmit motion and power from one rotating shaft to the other with tooth sets with appropriate profiles placed on their surfaces. Motion and power transmission are provided by gears in almost every machine, especially in automotive and aviation. Depending on factors such as working area, transmitted torque, and speed, motion transmission type, operating conditions, different types of gears made of different materials have emerged. Gear wheels must meet the motion conditions to function properly. The kinematic condition can only be achieved with a suitable tooth profile. The pitch circles of the gears in contact position are tangent to each other and contact at a single point, and this point is called the rolling point. For gear wheels transmitting at a constant speed, the linear velocities must be equal at the rolling point and the common normal drawn from the contact point of the gear wheels at any time must pass through the rolling point. This transmission condition is expressed as the law of gearing. The involute tooth profile is the most common tooth profile that provides conjugate movement.