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

QST12-27

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, so that it shows in the Selection-Window
3.Right-click the Ball-Joint element in the Selection-Window
4.Click 'Edit Element...' in the contextual-menu.

The Ball-Joint dialog-box opens.

Ball-Joint dialog box

Dialog-13.2-BallJoint

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

Enter the distance to the center of the Ball-Joint from the Mechanism Plane.

The symbol of 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.

Tutorial and Reference Help Files for MechDesigner and MotionDesigner 13.2 + © Machine, Mechanism, Motion and Cam Design Software by PSMotion Ltd