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Reduce the rotational speed of one shaft while increasing the torque transmitted to another using a helical gear. Simply said, there are two types: gears that transfer power between parallel shafts and cross-axis gears, which do the same thing but between shafts that are not parallel to one another. The involute tooth shape of a spur gear is preserved in a helical gear’s cross-section, but the gear is cut at an angle to the blank’s rotation. The helix angle describes this measurement. This article defines helical gears and discusses their functioning and popular uses.