Why use 'Add Dimension'?

Use Add Dimension to add dimensions to locate sketch-elements.

Add Dimension can define Distances and Angles.

See more 'How to add a dimension'.


Top-Tip - Learn how to edit a dimension in the dimension dialog-box!


Add Dimension

R13

R13

Toolbar:

Left-side of the Part-Editor graphics-area

Menu:

Add menu > Geometry sub-menu> > Add Dimension

To Add a Dimension:

1.Click Add Dimension in the Sketch-Elements toolbar
2.Click one or more sketch-elements

Add a dimension to locate a Point, dimension a distance, a radius, and an angle.

See more details below


The dimension shows near to your mouse pointer

- or -

If the dimension you want to add is already defined, with dimensions or with other constraints, then the dimension does not show.

3.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

4.Edit the dimension in the dialog-box

About 'Negative Dimensions'.

If the dimension is '–ve', then, do not delete the '–' sign, but edit the dimension in the normal way.

If you delete the '–ve' sign, the position of the sketch-element will 'flip' to the opposite sense of the dimension.

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

5.To close the the Dimension dialog-box
Click the OK    tick button

OR

Press the 'enter' key on you keyboard [R13.2+]

The Dimension is now in the graphic-area.



To open the Dimension dialog-box again so that you can edit a dimension:

1.If necessary, de-select Add Dimension ['Add Dimension' cannot be active].
2.Double-click the arrowhead of the dimension element

or

1.Click the arrowhead of the dimension element

Note - we recommend the arrowhead because it is is easier than the dimension-lines or extension-lines.

MechDesigner does not respond if you click the Dimension Value/Number..

Notes:

When sketch-elements are fully defined, you cannot add a new dimensions or constraints.  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_minus        Locate a Point

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

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

tog_minus        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.

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.

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

 


You can drag a Point sketch-element in the Mechanism-Editor:

If you:

Add a Point sketch-element
Do not add a Dimension or a Constraint to the Point sketch-element

and you

Add a Trace-Point to the Point in the Mechanism-Editor

and the

Part is a kinematically-defined Part.

Note: The drag option does not apply to a Point at the end of a Line or Arc sketch-element - it must be a Point sketch-element

tog_minus        Define 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_minus        Define 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_minus        Define 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

Bug: When you edit an angle: sometimes the angle does not like passing through 180. If MechDesigner hangs, then please wait, maybe a minute!

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 a possible eight:

If you move your mouse (in a circular fashion) 'anti-clockwise' around the *intersection of the two Lines, MechDesigner draws the angle less than 180° for the four angle possibilities – the 'acute', the 'obtuse', the 'supplementary' or the 'vertical' angle.
If you move your mouse (in a circular fashion) 'clockwise' around the *intersection of the two Lines, the four 'reflex' angles to the four 'anti-clockwise' angle possibilities are displayed.

DimAngPPPn

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

DimAngPPPn

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