Before starting this tutorial, you should have been able to:
• Use AutoCAD at an intermediate
to advanced level
• Manipulate the UCS
• Create Planar Surfaces
• Revolve Surfaces
• Rotate Surfaces
• Loft Surfaces.
The new 3D modeling tools in AutoCAD 2007 allow you to model complex freeform shapes that previously were not possible to model in AutoCAD. This tutorial assumes that the user is completely familiar with creating precise 2D sketches of arcs, lines, polylines, and splines in any location as well as the 3D tools from previous releases.
1. Open
the file named Tutorial
2 Putty Knife.
Figure 1
2. Turn off all
layers except the Handle Base Sketch and the Handle Solid
layers. Make the Handle Solid layer the active layer.
Figure 2
3. Set the “delobj”
variable to 0
so
that the sketches will not be consumed. That way if you make a mistake you can go back to the original
geometry. (Tip: There are new options for the delobj
variable – be sure to check them out.) Extrude the profile a distance of .75”. (Alternatively you could have used the new Presspull tool to “pull”
the solid. An advantage to the Presspull tool is that the profile does not need to be a closed polyline,
only a closed boundary.) Turn
off the Handle Base Sketch
layer.
Figure 3
4. Add a
.5 radius fillet to the 5
edges highlighted in Figure
4a.
Figure 4a
5. In the Visual
Styles control panel
of the Dashboard select Realistic
as the shade style. As you are working
you may want to change
to x‐ray mode from time‐to‐
time (shown here circled in red).
6. Make the Handle Hanger Hole Sketch layer
and the Construction layer visible.
Revolve the open cyan profile around
the centerline. Because the profile is open
the result will be a surface.
Figure 6
7. Move the cursor arrow to the area of the Make 3D control panel
in the Dashboard as shown in Figure 7. A down pointing
chevron will appear to
expand the control panel
revealing more tools.
Click on the chevron.
Figure 7
8. Click
on the Slice tool.
Figure 8
9. Select
the Solid and then press Enter.
Figure 9
10. Right Mouse Button (in the future I will refer to
RMB) and select Surface
from the list. Then pick the revolved surface.
Figure 10
11. Then following the prompts, select
the part of the solid you wish to keep. Move
the revolved surface to the Hide Surfaces
layer. If you shade the part you will
see a hole in the handle.
Figure 11
12. Make the Rivet Hole Sketch layer
visible and extrude the circle. You don’t have
to enter a height distance, simply stretch
the preview beyond
the handle solid and press Enter. Subtract
the extruded cylinder
from the handle.
Figure 12
13. Make the Handle Relief Sketch
layer visible.
Figure 13
14. Extrude the arc as a surface stretching any distance
beyond the far side of the solid
at least the width of the solid. Notice that the dynamic UCS changed on its
own.
Figure 14
15. Highlight a grip
and move the surface
down along the y‐axis beyond
the bottom edge of the solid as shown.
Figure 15
16. If the surface
doesn’t go completely through the solid,
select the arrow shaped grip and stretch
the surface out along the temporary
UCS z‐axis (‐z) as shown in Figure
16. The goal is to have the surface
completely slice through
the solid at both ends.
Figure 16
17. Slice the solid with the surface and then hide the surface and any visible
sketch layers.
Figure 17
18. Make the Blade Sketch layer visible and Extrude
the loop shown a distance of
1/32 into the handle. Subtract the resulting solid
from the handle. Mirror the
handle to the opposite
side and then turn off the visibility of the Handle Solid layer.
Figure 18
19. Make the Blade Solid layer the active layer.
Figure 19
20. Extrude the loop again 1/32” down.
Figure 20
21. While holding the Ctrl key select the face of the solid.
Figure 21
22. Select the grip and stretch the face a distance
of 1/32 for a total thickness
of 1/16 midplane about
the sketch.
Figure 22
23. Select the Loft tool in the Dashboard and then click the two splines
in the sketch.
Press Enter and then RMB change
the option from Cross‐sections to Guides.
Select the two lines at either end of the splines as the guides. (How
would you have created a spline bounded
solid in earlier
releases?)
24. Select the Thicken surface tool in the Dashboard and then thicken the lofted surface a distance of
1/32”. Move the lofted surface to the Hidden Surfaces layer keeping only the solids visible.
Figure 24
25. Determine which face of the blade needs to be stretched to match the thickness of the tab. Holding the Ctrl key click on the face, select the grip and stretch 1/32” as you did with the tab in Step 22. Union
the two solids together. Turn the Rivet Hole layer back on and make a hole in the blade tab for a rivet
to hold the assembly together.
Figure 25
26. Make the Blade Compound Angle
layer visible and the select the new Planar surface tool from the Dashboard. RMB select Object
and then click on the
rectangle.
Figure 26
27. Use the resulting planar
surface to slice the compound
angle on the blade and then hide any visible sketches
or surfaces.
Figure 27
28. Make a Rivet for the assembly.
Figure 28
After doing later Tutorials
come back to this one and experiment with making the same assembly using
the new Presspull command.
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