Spur equipment teeth are manufactured by either involute profile or cycloidal profile. Most of the gears are manufactured by simply involute profile with 20° pressure angle. When two gears are in mesh at one instant there is a chance to mate involute portion with non-involute component of mating gear. This phenomenon is known as “interference” and occurs when the number of teeth on the smaller of the two meshing gears is less than a required bare minimum. To avoid interference we can include undercutting, but this is not an appropriate solution as undercutting causes weakening of tooth in its base. In this situation Corrected gears are used. In fixed gears Cutter rack is usually shifted upwards or down.

Spur gears or straight-cut gears are the simplest sort of gear. They consist of a cylinder or disk with teeth projecting radially. Although teeth are not straight-sided (but usually of special form to achieve a constant drive rate, mainly involute but a lesser amount of commonly cycloidal), the edge of each tooth is straight and aligned parallel to the axis of rotation. These gears mesh together correctly as long as fitted to parallel shafts.[1] No axial pushed is created by the tooth tons. Spur gears are excellent in moderate speeds but are inclined to be noisy at high speeds.[2]

All of the Ever-Power spur gears come with an involute tooth shape. In other words, they are involute gears employing part of the involute curve because their tooth forms. Looking generally, the involute shape is among the most wide-spread gear tooth variety due to, among other reasons, to be able to absorb small center range errors, easily made development tools simplify manufacturing, dense roots of the teeth help to make it strong, etc . The teeth shape is often described as a specification in drawing of any spur gear as indicated by the height of teeth. Moreover to standard full depth teeth, extended addendum and stub tooth profiles exist.

Even though not limited to spur gears, account shifted gears are used when it is necessary to adjust the center distance slightly or to strengthen the gear teeth. They are produced by adjusting the distance between the gear cutting instrument called the hobbing tool and the gear in the production level. When the shift is great, the bending strength from the gear increases, while a negative shift slightly reduces the middle distance. The backlash may be the play between the teeth when two gears are meshed and is needed for the smooth rotation of gears. When the backlash is too large, it brings about increased vibration and sound while the backlash that is too small leads to tooth failure due to the lack of lubrication.