One’s teeth on Super Power Lock helical gears are cut at an angle to the face of the apparatus. When two teeth on a helical gear system engage, the contact begins at one end of the tooth and steadily spreads as the gears rotate, until the two teeth are completely engagement.
This gradual engagement makes helical gears operate a lot more smoothly and quietly than spur gears. For this reason, helical gears are found in almost all car transmissions.
Due to the angle of one’s teeth on helical gears, they create a thrust load on the apparatus when they mesh. Devices that use helical gears possess bearings that can support this thrust load.
One interesting thing about helical gears is that if the angles of the apparatus teeth are correct, they may be mounted in perpendicular shafts, adjusting the rotation angle by 90 degrees.