﻿ 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 in the graphic-area as you cycle the model
 • Find the exact position of a Point, with Mechanism Coordinates (read only).
 • Find and, if possible, edit the position of a Point with Part Coordinates. You can only edit its position when it does not have any other constraints.

[You do not need to open the Part-Editor when you 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
 2 Right-click the Point in the Selection-Window
 3 Click 'Edit element' in the contextual menu

- or -

 4 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

#### Show or Hide Velocity and Acceleration Vectors

Velocity and Acceleration Vector check-boxes

The Velocity and Acceleration Vectors:

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

To see the vectors:

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

Buttons to increase or decrease the scale of the vectors in the graphic area.

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

 • Click the up or down buttons below Velocity
 • Click the up or down button below Accel (Acceleration)
 Mechanism Coordinates
 Point Coordinates on the Mechanism Plane. The X, Y and Z–coordinate boxes are Read Only. The Origin [0,0] of the Mechanism Plane is at the small X– and Y–axes in the Base-Part.
 Lock And Set Position (Part Coordinates)

Two States of Point-Coordinates check-box

 • Lock and edit here
 • Edit in Part Editor

To edit the postilion of the Point using the data-boxes in this dialog,

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

Notes

 • If you use this check-box, 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.

For example, if the Point has a Coincident Constraint with a Line, it will not be possible to 'Lock and edit here'. This is because, the Coincident Constraint has removed one degree of freedom. This leaves the Point only one more degree-of-freedom. Thus, the Lock and edit here check-box cannot remove two more degrees-of-freedom from the Point.

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.

Help Files for MechDesigner and MotionDesigner 11.1 + © Machine, Mechanism, Motion and Cam Design Software by PSMotion Ltd