• Start a new design
• Set the unit to inches
• Tool>Options>Units tab>Inches

• To start this tutorial sketch a simple rectangle

• Create an arc in the lower right hand corner.

Create an arc with the arc tool. Click on one line. Then click and drag from another line. An arc will stretch between the two lines, then auto trim itself

Dimension the completed object with the sketch dimension tool

• Length = 6"
• Height = 3"
• Arc Radius = 1.5"

• Extrude the completed sketch 1". Call the extrusion Parent Extrusion

• This object is the parent. We will create a child on top of this parent

We will now create a new sketch on the top surface of the parent object.

• Use the select faces tool to select the top of the parent object.

• Start a new sketch. Right Click>New Sketch or Alt-N or Workplane>New Sketch

• Call the sketch Child 1

You have just created the first parent-child relationship. The new sketch is dependent on the surface of the parent object. If the extrusion distance of the parent object is changed, the location of the sketch will be moved.

Use the view onto workplane button to look straight down on your new sketching surface.

To create the child sketch we will project lines from the initial sketch.

• Using your edge select tool , shift select the right side, the arc and the lower side of the rectangle.
• Project the selected edges by Right Click>Project or Alt-P or Line>Project

This projected the selected edges into the current sketch. Not that Pro/D puts boxes on the projected lines. The boxes signify that the lines are projected and can only be altered on the sketch they were projected from.

• Add a diagonal line that connects the two end points of the project lines
• Extrude this sketch 0.5 inches. Call the extrusion, Child Extrusion

You have created a child of the original parent object. The relations governs

• Where the sketch is located (parent extrusion distance)
• The dimensions of the arc, and lines are controlled by the parent. The child will have to change whenever these dimension are changed

• Change your object browser to Features

• Double click the Parent Extrusion and change the Extrusion distance to 2 inches then hit the Update Button

Notice how the child moves up since its sketch is dependent on the top of the parent. This occurs since you created the child sketch on the top surface of the parent

Now activate the initial parent object sketch by double click the initial sketch in the object browser.

Change the radius of the arc to 1" using the constraint selection tool (double click the dimension) then hit the update button

Notice how the child arc changes to conform to the new parent arc size. This happens because the arc in the child sketch is a projection of the arc in the parent sketch

Experiment with this parent-child relationship concept

• Make a new sketch on top of the child. Call it child 2

• Project the arc into the new sketch and toggle to arc to a construction line

• Use the center of the arc to create a circle with a 0.4" radius.

• Project the hole, subtract material, below the workplane, thru the entire object

The hole is now also a child of the original parent

Change the radius of the arc and watch the hole move. This is because the location of the hole is based on the center of the projected arc.

This concludes the Parent-Child Tutorial