Dialog: Ball-Joint

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Dialog: Ball-Joint

Ball-Joint

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


We use the Ball-Joint for spatial mechanisms.

Most often, Ball-Joints join Parts that are in different Mechanism-Editors, such that their Mechanism-Planes are perpendicular().

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

The derived name for a Part with Ball-Joints at each end is a Connecting-Part.


Open Ball-Joint dialog-box

MD-GA-Click-BallJoint

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

1.Move your pointer above the end of the Connecting-Part until the Ball-Joint is red - see image.

2.Click the symbol for the Ball-JointRed-14-1.

Ball-Joint in the Selection-Window

Ball-Joint in the Selection-Window

The Ball-Joint element should be 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 is now open.


Ball-Joint dialog-box

Usually, you edit two Ball-Joints - one at each end of the Connecting-Part.

MD-Dialog-BallJoint

Ball Diameter

Diameter of the Ball symbol in graphic-area.

Ball-Diameter has no effect on the Kinematic-Analysis.


Ball Offset (±)

Perpendicular distance (±) from the Mechanism Plane to the center of the Ball-Joint.

Ball-Offset has an effect on the Kinematic-Analysis.


Ball Mass

Mass of the Ball-Joint.

Its center-of-mass is coplanar with the Mechanism-Plane. even if the Ball-Offset ≠ 0 .


MD-GA-BallJoint-Offset

Example of Ball-Offset : Z = 10mm

<<< image shows model from the  left view  - View toolbar > View Left (Shortcut : F7).

Red-14-1b The Ball-Joint is on the Mechanism-Plane when the Ball-Offset = 0mm.

Red-14-2 In the image the Ball-Offset = 10mm in the +Z-axis direction.

When to use the Ball-Offset parameter?

All other kinematic-elements are on the Mechanism-Plane. However, the center of Ball-Joints are frequently not on the Mechanism-Plane. It is important that the offset distance to the center of the Ball-Joint is correct to make sure the kinematic-analysis is correct.

See also : Ball-Joint Configurations