FIGURE – 1 Conceptual Sketch
Solutions to engineering design problems generally begin with a
, followed by a
detailed design phase
When the problem is designing a part, in the
beginning we are usually more interested in the features required to meet our functional
requirements than in the exact dimensions the part will inherit during its manufacture.
Often we might start out with a simple hand sketch.
Consider the sketch to the left.
This is a simple system to support a small overhead crane, perhaps in a garage.
other than the description of the 2x8 beam size the
sketch is dimensionless. It is just a quick
conceptual sketch of how a task, supporting the
rope pulley, might be accomplished.
Although the sketch does not contain the
information required to manufacture the bracket, it
does contain the features the part will require in
order to function as designed.
include a base to support the bracket to the beam,
holes to insert fasteners through the base into the
beam, a column of sufficient length to separate the
pulley from the beam, and holes to support the
axle parallel to the beam.
Prior to the development of the Feature-based, Parametric solid modeling packages, we
would want to gather more information before beginning to create a model with CAD,
because as soon as we lay down one end of a line, we need a length in order to complete
Since we don’t have all of our dimensions, this could be a problem.
Of course, we
could make up approximate dimensions and modify the drawing later, but this could be
With our feature-based system, we can worry about size after the shape
has been determined.
Let’s see how it works. Open Pro-E Wildfire 4.0 and set you working directory to
In the main menu, select
(or the New icon)
window will open.
Be sure that
are selected under
and Sub-type headings.
Name the part Pulley_Bracket_XXX, where XXX are
your initials (see Figure 2). Click OK on the
window to close it.
In the graphics window, note the outlines indicating three orthogonal planes representing
the three standard drawing views (FRONT, TOP, and RIGHT).
Also note the same
planes indicated in the model tree to the left.
You can select a plane either by clicking on
its outline in the graphics window or by clicking on its name in the model tree. We will
be creating a sketch on the FRONT plane, so select that plane, then select the Sketch Tool
A sketching plane (FRONT) will open in the graphics window.
Also the SKETCH
will open. Click
to accept the sketch plane.