Why use 'Add Dimension'?

Use Add Dimension to locate sketch-elements.

See more 'How to add a dimension to:'


Add Dimension

Toolbar-SE-AddDimension

Toolbar :

Geometry toolbar

Menu :

Add menu > Geometry sub-menu> > Add Dimension

To Add a Dimension:

2.Click Geometry toolbar > Add Dimension
3.Click sketch-elements to add a distance, a radius, or an angle

The dimension shows near to your mouse-pointer.

4.Click in the graphic-area to place the dimension and extension lines next to your mouse-pointer.

The Dimension dialog-box opens.

Dialog-13.2-Dimension

5.Edit the dimension in the dialog-box

Negative Dimensions.

Do not delete the '' sign. It is best to ignore it. Edit the dimension in the normal way.

See Why the dimension is negative.
See How to Edit Parameters in dialog-box.

6.Close the Dimension dialog-box
Click the OK-tiny-13-17 button

The Dimension is now in the graphic-area.


To edit a Dimension:

1.De-select all other commands

In the graphic-area:

2.Double-click the arrowhead of a dimension element

Why the 'arrowhead'?

MechDesigner will not respond if you click the Dimension Value or Number

And, simply, it is more difficult to click the dimension-lines or extension-lines.

See How to open a Dialog-box

Notes:

When sketch-elements are fully defined, you cannot add a new 'driven-dimension'.

As an alternative, you can use the Measurement FB in the Mechanism-Editor to add a 'driven-dimension'.

Generally, do not make a dimension zero. It is better to add a constraint [See Sketch-Constraints toolbar] to move Lines or Points together.

See also: Dimension Font Size

How to add a dimension to:

tog_minusLocate a Point

Specify the location of a Point in a Part in one of two ways:

Add Dimensions

Examples

Dimension

How?

Selection-Window

Geometry-Tree

Dimn-ptop

Shortest distance between two Points
Click each Point

DimPtoPn

DimLtoP

Perpendicular distance between a Point and a Line
You can also use the X–axis and the Y–axis as a line.

 

Click the Point then the Line (note Arcs, Circles and Lines have Points)

DimPtoLn

Use 'Lock & Specify' in the Point Vector and Location dialog box

Example

Dimension

Selection-Window / Geometry-Tree

Dialog-PointVectors-PartCoords-1

'Lock and Specify' the exact location of a Point in a Part.
The Point cannot be moved accidentally.

Pointn

Note:

You cannot 'Lock and Specify' the Point if it has zero or one degree-of-freedom.

or, in other words, ...

... if the Point has a dimension, or any other constraint, you cannot specify its location with Lock and Specify

How?

1.Double-Click a Point in the Part-Editor

- or -

1.Double-Click a Point in the Mechanism-Editor

The Point Vector Display and Location dialog-box opens.

Expand Point Coordinates

2.Select the Lock and Specify check-box.
3.Enter 'x' and 'y' values for the Point, with Part Coordinates

 

tog_minusDefine a Distance...

Example

Dimension:

How?

Selection-Window / Geometry-Tree

dim-line

Length of a Line

 

Click the Line

Dimn

dimltol

Distance between two parallel Lines
Distance between an axis and a parallel Line

 

1.Click a Point at the end of one of the Lines
2.Click the Line.

DimLtoLn

Dimn-ptop

Shortest distance between two Points
Click each Point

DimPtoPn

Dimension-P2P-Hor

Horizontal Distance between Points
1.Add a Vertical Line from one of the Points
2.Click the Line and the other Point

 

Dimension-P2P-Ver

Vertical Distance between Points
1.Add a Horizontal Line from one of the Points
2.Click the Horizontal Line and the other Point.

 

DimLtoP

Perpendicular distance between a Point and a Line [or axis].

Top-tip: Click the Point then the Line [or axis].

Note: Arcs, Circles and Lines have Points.

DimPtoLn

tog_minusDefine a Radius...

Example

Dimension:

How?

In Selection-Window as:

DimRn

Radius of a Circle

 

Click the Circumference of the Circle

DimRadiusn

DimRadn2

Radius of an Arc
Click the Radius of the Arc

DimRadiusn

tog_minusDefine an angle...

Example

Dimension:

How?

In Selection-Window as:

DimAng1

Angle between two Lines
Angle between an axis and a Line

*The angle is between the intersection of the Line 'rays', even if the Lines do not cross.

Click each Line

The displayed angle has rules. See Below

 

DimAngLtoLn

Angle between two Lines - Rules:

The dimension shows next to your pointer when you select two Lines. Before you click your mouse again to define the displayed angle, select which angle to display; from eight possible angles:

Move your mouse 'counter-clockwise' around the *apex of the two Lines, the 'acute', 'obtuse', 'supplementary', or the 'vertical' angle <180° will show.
Move your mouse 'clockwise' around the apex of the two Lines, the 'reflex' angles to the other angles will show.

Video:

How to...

Add an 1 of 8 possible angles between two Lines

 

'Expand' then 'Play'

How to...

Add an 1 from 8 possible angles between two Lines

 

DimAngPPPn

Angle between three Points
Click the Point that will form the apex of the angle, followed by the other two Points.

DimAngPPPn

Tutorials and Reference Help Files for MechDesigner and MotionDesigner 14.2 + © Machine, Mechanism, Motion and Cam Design Software by PSMotion Ltd