Dialog: Ball-Joint

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Dialog: Ball-Joint

Ball-Joint

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

Use the Ball-Joint for spatial mechanisms.

You must add a Ball-Joint to each end of one Part.  

Connecting-Part : the derived name of a Part that has a Ball-Joint at each end.

One of the two Ball-Joint joins the Connecting-Part to a Part (frequently, a Motion-Part) in a different Mechanism-Editor.

The other Ball-Joint, at the other end of the Connecting-Part, joins it to a Part in the active Mechanism-Editor.

How to open the Ball-Joint dialog

MD-GA-Click-BallJoint

There are two Ball-Joints, with one at each end of a Connecting-Part.

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

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

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

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 shortcut menu.
Ball-Joint in the Selection-Window

Ball-Joint in the Selection-Window

The Ball-Joint dialog is now open.

Ball-Joint dialog

Ball-Joint dialog

Ball-Joint dialog

Ball Diameter

Diameter of the Ball symbol in graphic-area.

Ball-Diameter does NOT effect the Kinematic-Analysis.

Ball Offset (±)

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

Ball-Offset does effect 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

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

Red-14-1b Ball-Joint : on the Mechanism-Plane when 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?

The symbols of all other Kinematic elements are on the Mechanism-Plane. However, the center of a Ball-Joint is frequently not on the Mechanism-Plane. The kinematic-analysis is correct only when the distance to the center of the Ball-Joint from the Mechanism-Plane is also correct.

See also: Ball-Joint Configurations