Cardboard Bridge Construction

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Cardboard Bridge Construction

• Inventor 2009

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Step 1

• Open Autodesk Inventor 2009
• Open the Card Board Bridge ipt file from the
  assignment log
• Use the View Cube to orient the view in a
  direction which you can work
• Right click on Sketch 1 and select Edit Sketch

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Step 2

• Use the video lesson Creating the Side Elevation
  - Cardboard Bridge from the assignment log to
  create the End Post (AI)
• Continue to create the Verticals BI, CJ, DK

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Step 3

• Your drawing should match this below before you
  use the mirror tool to create the rest of the
  Side Elevation
• Offset Vertical BI 4mm
• Then Offset CJ DK 6 mm.

DK CJ 6 mm
BI 4 mm
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Top Left Corner
The top left corner should look like Figure 1
once you have Offset Vertical BI 4 mm. Use Trim
and Extend to make it look like Figure 2.
The corner does not match up! THAT IS CORRECT
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Step 4

• Now your going to begin adding depth to each
  member of the Truss configuration.
• Click on Extrude, place your cursor over the End
  Post and weight for the selection arrow to
  appear.
• Scroll until only the End Post area is
  highlighted.
• Enter a depth of 10mm.
• Click OK

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Step 5
Once you make an Extrusion the Sketch becomes
consumed in the Feature. You can continue to use
that Sketch if you Share it.

• In the Browser Pain expand Extrusion 1
• Right click on Sketch 1
• Select Share Sketch

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Step 6
Use the shared Sketch one to create further
extrusions. Lets extrude one of the Verticals
(BI).

• Click on Zoom window to look at the left side.
• Use Trim to remove excess lines to create Figure
  1.
• Right click and select Finish Sketch
• Select Extrude and change the Extents Distance to
  10 mm
• Select Vertical BI and click OK (Figure 2)

I
B
Figure 1
Figure 2
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Step 7
Repeat those steps for Verticals CJ DK. (You
may have to do some trim or extending to get
those areas to be enclosed shapes.)

• Click on Zoom window to include Verticals CJ and
  DK.
• Select Extrude
• Change the Extents Distance to 10 mm
• Select Verticals CJ and DK, click OK

K
J
C
D
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Your model now
Your model should look like this up to this point
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Step 8
Now we are going to prepare for the Extrusion of
the Top Chord (10 mm.)

• Click on Zoom window to the top left corner.
• Right click on the shared Sketch 1 and select
  Edit Sketch.
• Trim off any lines so you have an enclosed shape
  for the Top Chord.

This is what it should like before you attempt to
Extrude.
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Step 9
Now we are going to Extrude the Top Chord 10 mm

• Right click and select Finish Sketch
• Click on Extrude and make sure the Extents is set
  to 10mm. Check the direction of the Extrusion.
• Select the Profile (Top Chord) and select OK.

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Step 10
Now set up to Extrude the Bottom Chord. (1 mm)

• Right click on shared Sketch 1 and select Edit
  Sketch.
• Use Zoom Window to Zoom into the lower right
  corner of the Truss assembly.
• Use Trim and Extend to create Figure 1.
• Use Zoom Window to Zoom into the lower left
  corner of the Truss assembly.
• You have to Trim off the bottom line of the
  Bottom Chord and redraw it (to create an enclosed
  shape to Extrude (Figure 2).

Figure 1
Figure 2
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Step 11
Now set up to Extrude the Bottom Chord. (1 mm)
CONTINUED..

• Draw a Line from the bottom left corner to the
  vertical line of Vertical DK you created in Step
  10-Figure 1.
• Extrude the Bottom Chord 1 mm.

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Your model now
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Step 12
Now create the Diagonals and Extrude 1 mm.

• Right click on shared Sketch 1 and select Edit
  Sketch.
• Draw the Center lines for the Diagonals as shown
  below.
• Use Offset to create the parallel lines that are
  4 mm apart for each Diagonal.

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Step 13
Extrude both Diagonals 1 mm.

• Select Extrude and repeat what you did for the
  other Diagonals.

Your model should look like this.
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Step 14
Now its time to Mirror the rest of the Truss
Configuration.

• Select Mirror and click on each Extrusion that
  you have made in the Browser.
• Click the Mirror Plan Button and select the face
  of the Bottom Chord.

This face to Mirror
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Step 15
Now its time to Mirror the rest of the Truss
Configuration. (Continued)

• Now click OK!

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Step 16
Now create the top of the bridge! (Top Struts and
Top Lateral Bracing)

• This is the sketch that I used to create half of
  the Top.
• Create the 6x6mm Top Struts spaced out as shown
  below.
• Then create the Top Lateral Bracing in two
  separate Extrusions.
• I Extruded and used Mirror to create the
  remainder of the part. (Notice that I made each
  set of Lateral Bracing in two Extrusions.)

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Step 17
Add a work plane to the Truss Configuration in
preparation for assembly. Remember, the distance
between the Front and Back is 90 mm (100 mm
center to center)

• Start by creating a work plane down the center of
  your Truss Configuration. This will be used for
  constraining your Top in the correct location.
• Select Work Plane from the Panel Bar, left click
  hold the mouse button down to activate the
  Offset box. Type in -5 mm as the value.
• Click Enter

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Step 18
Create a new Standard (mm).iam. (Metric Assembly)

• Insert 2 Truss Configurations
• Offset them 100 mm from each other using the Work
  Planes you created. (This leaves 90 mm between
  them)

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Step 19
Insert the Top Structure and Constrain the Top
Surfaces.

• Select Place Component from the Panel Bar and
  insert the Top Structure.
• Constrain the Top Face of the Top Structure to
  the Top of the Truss Configuration.

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Step 20
Constrain the Top Structure to the Front Truss
Configuration Work Plane.

• Select Constrain/ Mate and the Front Truss
  Configuration Work Plane.
• Select the opposing face of the Top Structure as
  your second selection.
• Click Apply

Opposing Face
Work Plane
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Your model now
This is what your model should look like now if
you followed these directions.
Notice that the Top Structure goes half way into
the Truss Structure
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Step 21
Create the Portal Bracing and Struts.

• Right Click in the assembly and select Create
  Component.
• Name the New Component Portal Bracing.
• Click on the face of the End Post to create the
  Portal Bracing (N, N)
• Use Project Geometry to begin creating the sketch
  to the right.
• Use Extrude to create the 6 mm Brace.

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Step 22
Now create the 1 x 4mm Diagonal Portal Bracing

• Right click on the 6 x6 mm brace you just created
  and select New Sketch.
• Create the Sketch illustrated to the right.
• Use Extrude to create the 1 mm depth.

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Step 23
Now use Mirror to add the Portal Bracing to the
other side

• Right click on the Portal Bracing and place your
  cursor over Component.
• Select Mirror.

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Step 23 continued.
Now use Mirror to add the Portal Bracing to the
other side

• In the Mirror Components Status Window Select
  Mirror Plane and select the plane illustrated
  here.
• Click Next.

This is the Work plane to use for Mirror
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Step 23 continued.
Now use Mirror to add the Portal Bracing to the
other side

• When the box below appears, click on Portal
  Bracing.
• Click OK.

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Step 24
Now create the Bottom Chords between the area
illustrated below.

• The Bottom Chords are 15 mm high and 6 mm wide.
  They are going to be aligned with the centerlines
  of the Verticals and flush to the bottom o f the
  bridge.

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Step 24
Create a sketch for extruding Bottom Chords

• Place a work plane on the bottom of the bridge.