<P> In helical and worm gears , the helix angle denotes the standard pitch circle unless otherwise specified . Application of the helix angle typically employs a magnitude ranging from 15 ° to 30 ° for helical gears , with 45 ° capping the safe operation limit . The angle itself may be cut with either a right - hand or left - hand orientation . In its typical parallel arrangement , meshing helical gears requires that the helix angles are of the same magnitude and cut oppositely . </P>
<P> In helical and worm gears , the helix angle denotes the standard pitch circle unless otherwise specified . Application of the helix angle typically employs a magnitude ranging from 15 ° to 30 ° for helical gears , with 45 ° capping the safe operation limit . The angle itself may be cut with either a right - hand or left - hand orientation . In its typical parallel arrangement , meshing helical gears requires that the helix angles are of the same magnitude and cut oppositely . </P>
for helical gear the helix angle generally ranges from
for helical gear the helix angle generally ranges from
15 ° to 30 °
15 ° to 30 °