Mechanism | Add Pin-Joint

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Mechanism | Add Pin-Joint

Add Pin-Joint

See also: Edit-Pin-Joint ( Motor and Gearbox Sizing )

What is a Pin-Joint?

Typically, use a Pin-Joint to model a rotary bearing.

MechDesigner definition: a Pin-Joint makes a Point in a Part become co-axial (coincident) with a Point in a different Part. The two Parts can rotate relative to each other, on the Mechanism-Plane.

IFTOMM definition: a Pin-Joint makes an axis in one part become collinear with an axis in a different part, but allows the axes rotate relative to each other.



Kinematic Elements Toolbar : Add Pin-Joint icon

Menu :

Add menu > Mechanism sub-menu > Add Pin-Joint

Dialog-Box :

Kinetostatic Servomotor Sizing (motor and gearbox sizing)


Pin-Joints in the graphic-area

Red-14-1b PointSymbol the symbol of a Pin-Joint between an Added-Part and the Base-Part.

Red-14-2 PointandPinJoint-Symbol the outside circle is the symbol of a Pin-Joint between two Added-Parts

The 'inside circle'(o), which is 'inside' each Pin-Joint symbol, is the symbol for the two Points that have become coincident, and co-axial, when you add the Pin-Joint.

<<< Pin-JointRed-14-1b between a Part and the Base-Part

<<< Pin-JointRed-14-2  between two Added-Parts

See also:

Add Slide-Joint

Add Ball-Joint

Add Motion-Dimension FB

Add Pin-Joint


STEP 1: Add Pin-Joint


1.Add menu > Mechanism menu  > Add Pin-Joint

- or -

1.Kinematic-elements toolbar > Add Pin-Joint

STEP 2: Select two Points:

1.Click a Point in a free Part

2.Click a different Point in a different free Part

- or -

2.Click a Point in a kinematically-defined Part.

Note: If the Select-Elements dialog-box shows, see Pin-Joint Special Case

STEP 3: Complete the command:

If the Points do not snap together:

1.Click the graphic-area

The Points snap to become coincident to give Pin-JointRed-14-3 or Pin-JointRed-14-4




In this example, the kinematic-chains are not solved (kinematically-defined) and have Blue Parts.

Thus, the Kinematics-Tree shows only the simple elements in Unsolved Mechs

More typically, a Pin-Joint is an element in a complex machine element. For example:


Dyads (also termed Assur Groups)


Belt and Pulley


VIDEO : Add Pin-Joint - Simple-Case:


How to...

Add a Pin-Joint - Simple-Case



tog_minusSpecial-case - Add two coincident Pin-Joints

VIDEO - Add Pin-Joint - Special-Case:

'Expand' then 'Play'

How to...

Add a Pin-Joint - Simple