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The knuckle joint is a joint that allows the pivot of a lever arm. The most common design of the knuckle joint is the universal joint. In this type of universal joint, one end has an axis with a larger number of degrees of freedom, while the other end has a smaller number. This allows for movement in 360 degrees and through any angle, which makes it very versatile.

Symmetry constraints are constraints that can be applied to an object to maintain a symmetrical shape. They are used frequently in Autodesk Inventor due to the 3D modeling software's ability to create perfectly symmetrical objects.

Constraints eliminate degrees of freedom (DOF) and are consequently more popular than Joints in terms of usage. One (or more) DOF is removed when you apply a constraint (adding relationships), such as marrying two components in an assembly. The motion of a part is defined by its joints. With less input and fewer relationships, they are able to accomplish this.

The knuckle joints in Autodesk Inventor are typically attached to the outside of a model and can vary in complexity. There are three types of joints: revolute, hinge and ball-and-socket. Each example includes an explanation of the difference between these joints as well as a description of how each type might be used.

In Autodesk Inventor, the knuckle assembly is a joint that connects two shafts together. An assembly can be created by selecting the "Knuckle Joint" option from the "Joint" menu. Autodesk Inventor will then prompt you to enter the number of degrees of freedom in order to provide visual feedback on how the joint rotates during assembly.

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