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Helical gears are similar to spur gears except that the gears teeth are at an angle with the axis of the gears. A helical gear is termed right handed or left handed as determined by the direction the teeth slope away from the viewer looking at the top gear surface along the axis of the gear. (Alternatively if a gear rests on its face the hand is in the direction of the slope of the teeth) . Meshing helical gears must be of opposite hand. Meshed helical gears can be at an angle to each other (up to 90o). The helical gear provides a smoother mesh and can be operated at greater speeds than a straight spur gear. In operation helical gears generate axial shaft forces in addition to the radial shaft force generated by normal spur gears.

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