# *ParallelAxesJointPair() - parallel axes joints (normal)

Creates a parallel axes joint pair with its axes parallel to normal defined by a point or vector.

## Syntax

`*ParallelAxesJointPair(joint_name,"joint_label",body_1, body_2, origin, NORMAL, POINT|VECTOR, point|vector)`

## Arguments

- joint_name
- The variable name of the parallel axes joint pair.
- joint_label
- The descriptive label of the parallel axes joint pair.
- body_1
- The first body or body pair constrained by the parallel axes joint pair.
- body_2
- The second body or body pair constrained by the parallel axes joint pair.
- origin
- The location(s) of the parallel axes joint pair of body_1.
- NORMAL
- A required argument when a point, point pair, vector, or vector pair is used to define the axes of the joint pair.
- POINT|VECTOR
- A keyword that indicates the alignment method.
- point|vector
- An entity variable referring to a Point, PointPair, Vector, or VectorPair which is based on the above keyword.

## Example

```
*BodyPair(body_1, "First body", p_1)
*BodyPair(body_2, "Second body", p_2)
*PointPair(point_1, "CM of first body")
*VectorPair(v_Z, "Global Z")
*ParallelAxesJointPair(j_paraxes, "Parallel axes joint", body_1,
body_2,
point_1,
NORMAL,
VECTOR,
v_Z)
```

## Context

## Properties

Property | Returns Data Type | Description |
---|---|---|

b1 | BodyPair | The first body pair constrained by the parallel axes joint pair. |

b2 | BodyPair | The second body pair constrained by the parallel axes joint pair. |

i | MarkerPair | The marker pair on b1. |

j | MarkerPair | The marker pair on b2. |

l | PlanarJoint | Left parallel axes joint. |

label | string | The descriptive label of the parallel axes joint pair. |

r | PlanarJoint | Right parallel axes joint. |

state | boolean | Control state (TRUE or FALSE). |

varname | string | The variable name of the parallel axes joint pair. |

## Comments

The individual joints of a *ParallelAxesJointPair() can be referred to as joint_name.l (left parallel axes joint) and joint_name.r (right parallel axes joint).

A parallel axes joint pair constrains the relative rotation between two body pairs such that the two axes pairs always stay parallel. The axes may be defined by either specifying a point or vector (using the NORMAL flag for the sixth argument) or specifying two points or vectors that lie in the plane normal to the axes (using the INPLANE flag for the sixth argument).

When a point is used (instead of a vector) to define an axis, it is obtained as the direction from the origin of the joint to the specified point.