﻿ Dialog: Ball-Joint

# Dialog: Ball-Joint

## 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.

#### 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-Joint 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? 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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