Summary of the Step

The sketch is still blue. Blue sketch-elements are not fully defined.

We will now add Vertical, Horizontal (or use Parallel) Constraints and a Dimension to establish the design intent of the sketch.

tog_minusComplete the Sketch


Icon-SE-Parallel Add Parallel constraint 1GS


STEP 1: Click Add Parallel1GS in the Constraints Toolbar
STEP 2: Click the Line1s-red at the base of sketch
STEP 3: Click the X-axis2s or CAD-Line



Step 3 is Complete

Alternatively, you could use:

Icon-SE-Horizontal Add Horizontal Constraint to the Line at the bottom of the sketch-loop.

Alternatively, you could use:

Icon-SE-Equal Add Equal Constraint to the Arcs at the ends of the CAD-Line


Icon-SE-Vertical Add Vertical Constraint


Add a Vertical constraint to the Line at the left of the sketch:

STEP 4: Click Add Vertical constraint
STEP 5: Click the Line to the left of the sketch


Step 5 is complete

Alternatively, use the

Icon-SE-ParallelAdd Parallel constraint and click the Line and the Y-axis.

Alternatively, use the

Icon-SE-Equal Add Equal constraint between the Arcs at the bottom left and the top of the sketch-loop.

tog_minusDimension the Sketch-Loop


Icon-SE-Dimension Add Dimension

Dimension between the X-axis and the centre-Point of the Arc along the Y-axis

STEP 1: Click Add Dimension
STEP 2: Click the Horizontal X-axis and then the centre-Point of the Arc.


STEP 3: Move your mouse-pointer and click the graphic-area to 'position' the Dimension

Step 3 is complete


The Dimension dialog-box opens – see the image to the left

STEP 4: Edit the dimension.
STEP 5: Set the dimension to 50mm

Do you remember how?

1.Right-click in the dimension parameter box
2.Click 'Round'
3.Use the spin-box tool to change the value to exactly 50mm.


Icon-SE-Dimension Add a dimension to one of the Arcs:


STEP 6: Click one of the Arcs in the sketch
STEP 7: Click again to 'place' the dimension extension line


The Dimension dialog-box opens:

STEP 8: Edit the radius of the arc to 30mm

Step 8 is complete

The sketch-elements are now black [or the colour as defined in Application-Settings > Graphics > Display Colours > Geometry Fully Defined.

The new colour of the sketch-elements indicate they are fully defined.

tog_minusClose the Part Editor


Close the Part-Editor:

STEP 1: Click Add Dimension to cancel it
STEP 2: Double-click a sketch-element, the X or Y-axis
- or -
Click Edit Part to deselect it 1GS


When you close the Part-Editor, the X-axis of the Part will still be horizontal!

In the Mechanism-Editor, the sketch-elements in a Part are the same colour as its Part-Outline , NOT the colour of the sketch-elements in the Part-Editor.


STEP 3: Click the View Align tool, in the View Toolbar.

The Base-Part is now horizontal


This Part is kinematically-defined. Therefore, in the Mechanism-Editor, the Part-Outline and the sketch-loop are coloured Green.

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