Spatial Kinematic-Chains and Ball-Joints.

When you cannot model a kinematic-chain on one Plane, it is a Spatial Kinematic-Chain.

A spatial kinematic-chain may have Cylindrical, Spherical and Helical-Joints. However, MechDesigner is limited to those kinematic-chains with Spherical-Joint. With Packaging, Textile and Automation machinery, the spherical-joint is used almost exclusively. In fact, I have used the Cylindrical-Joint only one time, and a Screw-Joint only one time.

In MechDesigner, we use the term 'Ball-Joint' for the 'Spherical-Joint'.


IMPORTANT:

Ball-Joints and Mechanism Misalignment

In machines, two Rod-End Bearings at the ends of one Part are frequently used to allow a small amount of misalignment between two other parts in a kinematic-chain. When the primary function of the Ball-Joints is to make sure the mechanism does not bind, then model the mechanism on one Plane with Pin-Joints as a 'planar kinematic-chain'.  But, of course, in your machine, use Rod-End bearings.


This Tutorial

We will look at 'Planar' and 'Spatial' mechanisms.
We will design a typical spatial mechanism.

Icon-AddBallJoint Spatial and Planar, Design a Spatial Mechanism

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