Ball-Joint dialog-box

Summary of Ball-Joint

We use the Ball-Joint for spatial mechanisms. Most often, we use them to join Parts that are different Mechanism-Editors, when the Mechanism-Planes are perpendicular[] to each other.

A Ball-Joint must be added at each end of one Part.

Ball-Joint dialog-box

Use the Ball-Joint dialog-box to edit parameters of a Ball-Joint.

See Also: Add Ball-Joint. Tutorial 12: Design a Spatial Mechanism

How to open the Ball-Joint dialog-box


The actual Ball-Joint element may be hidden inside the symbol of the Connecting-Part.

1.Move your pointer to the end of the Connecting-Part until it becomes Red - see image.
2.Click the Ball-Joint1s-red symbol.

The Ball-Joint element should now show in the Selection-Window

3.Right-click the Ball-Joint in the Selection-Window
4.Click 'Edit Element...' in the contextual-menu.

The Ball-Joint dialog-box opens.

Ball-Joint dialog box parameters:


Ball-Joint dialog-box parameters:

Ball Diameter

Enter the diameter for the symbol of the 'Ball-Joint's Symbol'.

Notes: Do Visibility toolbar > 'Show Model in Mechanism' to view the Ball. Typically, make the radius symbol of the Ball-Joint to be 1.25 <> 1.4x the symbol for the radius of the Connecting-Part.

Ball Offset

The distance [±] to move the Ball-Joint along the Z-axis from the Mechanism Plane.

When you edit Ball-Offset, the Ball-Joint will move from the Mechanism-Plane.

Why do you need this parameter? See Ball-Joint configurations

The kinematic analysis of a Dyad with two Ball-Joints is different to that of a Dyad with two Pin-Joints. The kinematic analysis is different to uses the Ball-Offset parameter to calculate positions, velocities and accelerations.

Ball Mass

Enter the Mass of the Ball-Joint.

MechDesigner calculates planar forces. The centre-of-mass is coplanar with the Mechanism-Plane.

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