﻿ MechDesigner Reference & User Interface > 2.2 Mechanism-Editor: > Kinematic elements > Mechanism | Add Pin-Joint

# Mechanism | Add Pin-Joint

## Add Pin-Joint

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

#### Terminologie

 Technical Definition: Revolute Joint : A joint that only allows relative rotary motion between two Parts (rigid bodies) on one Mechanism-Plane. MechDesigner definition : Pin-Joint : A joint between two Parts on a Mechanism-Plane that forces a Point in one Part to be coincident with a Point in the other Part. Point : A fixed position on the XY-Plane of a Part. Point (alternative definition) A Point represents an Axis that is perpendicular to the Part Mechanism-Plane. Pin-Joint (alternative definition) : A joint in which an axis (defined by a Point) in a Part is made to be a coincident with an axis (defined by a Point) in a different Part. The axes are perpendicular to the Mechanism-Plane. The XY-Plane of all Parts (and the Base-Part) in a Mechanism-Editor are coplanar with the Mechanism-Plane.

### Pin-Joints in the Graphic-Area

 - symbol for a Pin-Joint that is fixed to the Base-Part.  - the outer circle is the symbol for a Pin-Joint that moves relative to the Base-Part The inner circle is the symbol for the Points that become coincident when you do Add Pin-Joint.

<<< Pin-Joint between a Part and the Base-Part.

<<< Pin-Joint  between two(2) added Parts.

### Add Pin-Joint

STEP 1: Add Pin-Joint

 1.Mechanism-Editor: Add menu > Mechanism menu  > Add Pin-Joint - or - 1.Mechanism-Editor: Kinematic-elements toolbar > Add Pin-Joint

STEP 2: Select two(2) Points:

 1.Mechanism-Editor: Click a Point in a free Part 2.Mechanism-Editor: Click a Point in a different free Part - or - 2.Mechanism-Editor: Click a Point in a kinematically-defined Part.

The two(2) Points become coincident at the Pin-Joint.

If the Select-Elements dialog opens - see Special-Case

See also:

Add Slide-Joint

Add Ball-Joint

### VIDEO : Add Pin-Joint - Simple-Case

Add Pin-Joint (Simple Case)

### VIDEO - Add Pin-Joint - Special-Case:

Add Pin-Joint - Special Case