﻿ Dialog: Point: Vectors and Point Location

# Dialog: Point Position & Vectors

## Point Position and Vector dialog-box

Use this dialog to:

 • Show Velocity and Acceleration Vectors of a Point as you cycle the model.
 • Find the exact position of a Point on the Mechanism-Plane, with Mechanism Coordinates (read only).
 • Find the position of a Point point on the Part-Plane, with Part Coordinates.
 • Edit the position of an Point you have added to the Part, using Part Coordinates.

Note: With this dialog,  you can edit the Point's position ONLY when it does not have any geometric constraint added to it.

[You do not need to open the Part-Editor to edit the position of a Point with this dialog]

#### To open the Point Position and Vectors dialog box:

In the Selection-Window:

 1 Click a Point one time in the graphic-area

The Point should be in the Selection-Window

 2 Right-click the Point in the Selection-Window
 3 Click 'Edit element' in the contextual-menu

- or -

 2 Double-click the Point in the Selection-Window

- or -

In the graphic-area:

 1 Double-click a Point in the Mechanism-Editor

- or -

 1 Double-click a Point in the Part-Editor

### The Point Position and Vectors dialog-box

There are three separators:

 • Show or Hide Vectors
 • Mechanism Coordinates [Read-Only]
 • Point Coordinates [Read-Write]

Velocity and Acceleration Vector check-boxes

If you show the Point's Velocity and Acceleration Vectors, they:

 • Start at the Point
 • Their length is proportional to their instantaneous velocity and acceleration value
 • The velocity and acceleration magnitudes show at the end of each vector.
 • Are Blue for Velocity, Red for Acceleration [default colours]

To see the Point's vectors:

 • The Point must be a child to a kinematically-defined Part
 • The Point must move

Buttons in the Feedback-Area to change the scale of the Vectors

To change the scale and length of the vectors, use the buttons in the Feedback-Area:

 • Click the up or down buttons below 'Vel' to edit the Velocity Vector
 • Click the up or down button below 'Accel' to edit the Acceleration Vector

 The position of the Point is given with X, Y, and Z-axis coordinates that are relative to the Origin of the Base-Part and Mechanism-Plane. The X, Y, and Z boxes are Read-Only. The Origin [0,0] of the Mechanism-Plane is at the small 0,0 of the Base-Part., which is indicated by the small X- and Y-axis arrows.

The position of the Point is given by it x and y-axis coordinates that are relative to the Origin of the Part with which the Point is associated.

Lock and Edit Point's Position.

There are two states

 • Lock and edit here
 • Edit in Part Editor

To edit the position of the Point using the x: and y: data-boxes in this dialog,

 1 Click the check-box 'Lock and Edit here'.

Notes:

 • If you use Lock and Edit Here, you will not be able to edit it in the Part-Editor.
 • This option over-rides any dimensions or constraints you have used in the Part-Editor.

To lock the position of the Point using the data-boxes in this dialog,

 1 Click the check-box 'Edit in Part-Editor'.

The Point remains 'free' and you can edit it, as normal, in the Part-Editor.

If you use the Lock and Specify check box, you can:

 • Enter the Position of the Point along the X–axis of the Part
 • Enter the Position of the Point along the Y–axis of the Part

Locked Points

The y-axis of an Added-Part is along its CAD-Line. The y-axis of an Added-Part is at +90º to the CAD-Line, on the Part and Mechanism Plane.

The x- and y-axis of the Base-Part is the same as the X– and Y–axis of the Mechanism Plane.

If you edit the position of a Point, MechDesigner over-rides any constraints and dimensions given to the Point in the Part-Editor.

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