About Joints

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A joint is used to constrain the relative motion of a pair of rigid bodies by physically connecting them.

 A rigid body acts and moves as a single unit. SolidWorks components automatically become rigid bodies in COSMOSMotion.

The following table shows the joints supported by COSMOSMotion with the translational and rotational degrees of freedom that they constrain.

Joint:

Translational DOF:

Rotational DOF:

Total DOF
Constrained:

Revolute

3

2

5

Translational

2

3

5

Cylindrical

2

2

4

Spherical

3

0

3

Universal

3

1

4

Screw

.5

.5

1

Planar

1

2

3

Fixed

3

3

6

 Because a screw joint constrains one degree of freedom by relating a translation to a rotation, we divide the one degree of freedom between translation and rotation.

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