Creo Mechanical CAD/CAM
Assisted Exercises 2
Sweeps
A sweep is created by defining two sections. The first section is the trajectory and
the second is the cross-section. The trajectory is the path the cross-section is swept
along. The trajectory is always created as the first step. Then the cross-section is
created and located with respect to the trajectory. Sweeps can be used as forms for
protrusions, cuts and slots.
The trajectory for a sweep may be sketched open of closed. Choose Done when
finishing sketching the trajectory. The system then re-orients the viewer so that the
entity with the start point indicator is normal to the screen and on the plane of the
screen. Note that the trajectory cannot intersect itself.
Figure 1: Picture frame
EXERCISE 1: Picture frame
Construct a picture frame similar to that shown in figure 1. The general steps are:
1. Create a part named frame and create three default planes (or use New Part.
2. sweep Protrusion.
3. Choose Sketch Traj from the SWEEP TRAJ menu.
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4. Pick your sketching plane and view direction.
5. Now Sketch, a trajectory. Choose appropriate dimensions for a picture frame.
6. When the trajectory is complete, select the tick icon.
The system has now placed you in another sketcher session so you can sketch the
cross-section of the sweep.
1. Sketch a cross section similar to that shown in figure 1.
2. When the cross-section is complete, select the tick icon.
3. You can then Preview for the dialog box before clicking OK to complete the
feature.
Extend the object to including a picture plate and use the VIEWColor and
Appearance options to give the unit a display finish.
Blends
A blended feature consists of a series of at least two planar sections with Creo joins
together at their edges with transitional surfaces to form a continuous feature.
Blends can be used as forms for protrusions, cuts or slots.
Parallel blends are created from a single section which contains multiple contours
called sub-sections. Each segment in each section is matched with a segment in the
following section. The blended surfaces are created between the corresponding
segments. Note that in most cases each segment or sub-section must always have
the same number of segments/vertices.
While blending the sections together, Pro/E connects the start point of each section
and continues to connect the vertices in a clockwise manner. The start point can be
changed for any section.
When creating a parallel blend, all sections are created in the same sketch. Sec
Tools, Toggle must be used to sketch the next section (the inactive sections will
then be displayed in gray). The system will prompt you for the depth between
sub-sections.
EXERCISE 2: Trophy
Design an interesting shaped trophy (more elegant than the ones shown here!) using
a blend as your basic feature. The following instructions describe how to create a
basic blend.
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Figure 2: Examples of smooth or straight blends.
1. Create a part, with datum planes, named trophy.
2. Choose blend Protrusion.
3. Accept the defaults in the BLEND OPTS menu and choose Done.
4. Accept the default Straight if you want a straight blend or choose Smooth if
you prefer, then choose Done.
5. Pick your sketching plane and view direction.
6. Sketch, the bottom section of your object.
7. To construct your second section, select Toggle, from the pull-out menu
(Right Mouse Button)
Note: if you want to use the same section several times, save it (using Save as than
return and a new name for your section). Then, you can use it by choosing Sec
Tools, Place Section and enter the same of your section. it will then ask you for a
rotation angle, picking points for rotation and motion, and a scale factor.
1. When you finish your last section choose tick from the SKETCHER menu.
2. Enter the depth you want between your sections at the prompts.
3. Choose Preview and then OK from the dialog box to complete the feature.
To make changes to your design, choose Redefine and select the blend feature.
Then make the appropriate changes to the feature.
P. Long
May 15, 2014
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