About Joints

A Kinematic Joint specifies the relative movement between two Parts.

The joints we have are Pin-Joint, Slide-Joint and Ball-Joint.

Objective of this Step

1.Add your first Joint
2.Learn that a Joint is always between two Parts.

Summary of this Step

1.Click Add Pin-Joint
2.Click a:
Point in the Base-Part (Step 1.3)

and a

Point at the Origin of the new Part (Step 1.2)

Note: When the model becomes large and complex:

You need to click the two points two times - the first time to 'wake up' a point, and the second time to select it.
After you click the two Points, you must click the graphic area to pull the two points together as a Pin-Joint.

Information

This help file uses the term 'Pin-Joint'.

Other terms you may know for a Pin-Joint are: Pivot-Point, Hinge-Point, Revolute Joint, Shaft Centre...

Video of this Step

How to...Add a Pin-Joint between two Points

Step-by-Step Instructions: Add a Pin-Joint

Add Pin-Joint icon

Expand the vertical Kinematic-elements toolbar to the LEFT-SIDE of the graphic-area.

STEP 1: Click Kinematic-elements toolbar > Add Pin-Joint
- or -
Click Add menu >  Mechanism sub-menu > Add Pin-Joint

QST1-4-2

The cursor [mouse-pointer] changes to Add Pin-Joint.

The Command-Manager in the Project-Explorer instruction is:

In the graphic-area: select a Point from two separate Parts. The Points are made coincident. The Parts can only pivot around each other.

GA-MechEditor-AddPinJoint-0

STEP 2: Click the Point at the Origin of the Added-Part

It is best to click the Point at the Origin of the new Part when the Part is to become a 'Crank'.


'Added-Parts' always have two Points: one at each end of the CAD-Line along its centre.

You can add more CAD-Lines and Lines with the Part-Editor, of course.

GA-MechEditor-AddPinJoint-1

STEP 3: Click a Point at one end of the Line in the Base-Part

Warning

Notes:

1.The first element (in this command, a Point) MUST remain RED as you click the second element (in this command, a different Point in a different Part).
2.If you click the second element but actually miss it, MechDesigner cancels the first element you click.
3.You MUST click the two Points again.

GA-MechEditor-AddPinJoint-2

The Point in the Added-Part snaps to the Point in the Base-Part.


You may need to click the graphic-area to complete the command.

To cancel the Add Pin-Joint command, do one of the following:

Click Add Pin-Joint in the Geometry toolbar to the left-side of the grahic-area

- or -

Right-click in the graphic-area

Note: the contextual sensitive command-palette appears at the same time when you right-click in the graphic-area.

- or -

Use the ESC key

-or -

Select a different command

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