helix_angle

property WormGear.helix_angle: Angle

Helix angle of the worm gear. It must be an instance of Angle.

The maximum allowable value of helix angle depends on the pressure_angle.

Once set at the worm gear instantiation, it cannot be changed afterward.

Returns

Angle

The helix angle of the worm gear.

Raises

TypeError

If helix_angle is not an instance of Angle.

ValueError

If helix_angle is greater than the maximum allowable helix angle, depending on pressure_angle value.

Maximum Helix Angle Table

Pressure Angle	Maximum Helix Angle	Lewis Factor
14.5	16	0.1
20	25	0.125
25	35	0.15
30	45	0.175