Torsion Springs - Modified Design Dialog Box (AutoCAD Mechanical Toolset)

Material

Specifies required material in accordance with the selected standard

Wire diameter d

Specifies wire diameters in accordance with the selected standard.

Outer Diameter Da

Enter a value for either the Outer Diameter Da, or index ratio Dm/d, where Dm is mean coil diameter, d is wire diameter of the spring.

Unloaded Length L0

Specifies the unloaded length of the spring.

Angle of Ends

Lets you change the angle between the ends of the spring. Angle of ends, wire diameter and outer diameter of the spring are interdependent. If you change one, the others are automatically recalculated.

Overlapping Coils

If this check box is activated, it means that the torsion spring is preloaded with force F0 on distance L0.

Helix Direction

Select one of two spring helix directions: Right, or Left.

Results: Loads tab

 

Spring dimensions:

d-wire diameter x Da-outer diameter x L0-unloaded length. Depending on the selected standard, instead of outer diameter Da mean diameter Dm can be displayed.

 

Force:

F1- load in state 1, F2- load in state 2, Fn- maximum allowed load.

 

Deflection

s1- deflection in state 1, s2- deflection in state 2, sn- maximum allowed deflection.

 

Length:

Lengths of spring caused by corresponding forces (L1, L2, Ln). Number of displayed forces depends on selected specification.

Results: Stresses tab

 

Stress:

Stress in spring calculated according to the forces.

 

Allowed:

Allowed stress in spring

 

Safety:

Safeties calculated as a ratio between stress and allowed stress in the spring