Spring FB

See also: Spring FB dialog-box

Use a Spring FB to apply a force between two Points that are in two different Parts.


Forces toolbar > Add Spring FB

Menu :

Add menu > Forces sub-menu > Add Spring FB

Dialog-Box :

Spring FB dialog-box.

How to add :

1.Click Forces toolbar > Add Spring FB
2.Click, in the graphic-area, two different Points in two different Parts.

The Spring FB and its symbol are now in the graphic-area.

The Points you select for the spring are its Anchor Points.


Spring FB : symbols in graphic-area.

The Spring FB element has three symbols in the graphic-area:

Symbol Red-14-1b: FB - see also Spring FB connectors

Symbol Red-14-2: Spring between the anchor-points

Symbol Red-14-3: Dimension between the anchor-points.

Spring FB ConnectorsRed-14-1b


Top: Distance, Velocity, Acceleration of the dimension between the anchor-points.
Bottom: Total Force, Force-X, Force-Y between the anchor-points.

Input-Connectors - see more at Spring FB dialog-box

Add a user-defined Force Function
The data-values at the input-connector to the Spring must be Force units, (SI Newtons).
Convert any data-type and units with a Maths FB, and use Force as the Output Data Type.
Positive (Negative) value will Pull (Push) the Anchor Points together (apart).


Spring FB in the graphic-area.

The Spring FB can be in three different states:

State 1: Active Spring FB

This is the default state.


State 2: Disabled Spring FB

To disable the Spring FB,

1.Edit the Spring FB to open the Spring FB dialog-box
2.Deselect the Enable Check-box.
3.Click OK-tiny-11-15 to close the dialog-box.


State 3: Linear Motor

To enable the Spring as a Linear-Motor:

1.Edit a Kinematic-Chain to open the Configure Power Source dialog-box
2.Click the Motion-Dimension FB that applies to the kinematic-chain
3.Click the Spring as the Power Source, and it becomes a Linear Motor.
4.Close the Configure Power Source dialog-box.

See Configure Power Source

Tutorials and Reference Help Files for MechDesigner and MotionDesigner 14.2 + © Machine, Cam, Mechanism, and Motion Design Software by PSMotion Ltd