Question

Design for Sustainability (DFS) is a DFX emphasis on sustainability, meaning that the primary design emphasis is on minimizing the negative or adverse impacts of production, usually with respect to ecology, but also on economy and society. Give two examples of ways that Design For Additive Manufacturing (DFAM) could also accomplish some of the goals of DFS.

Describe the steps you would use to create a circular pattern of holes in a part (*.ipt) in Autodesk Inventor Professional 2016.

Describe the process you use to use to prepare a *.stl file for processing by Slic3r. What considerations should you address with respect to object position?

Why is systematic file naming important for interacting with the Taz 3D printer using the “print from SD Card” command?

Explain why simplicity is an important factor in design

Answer 1

Describe the steps you would use to create a circular pattern of holes in a part (*.ipt) in Autodesk Inventor Professional 2016.

Describe the steps you would use to create a circular pattern of holes in a part (*.ipt) in Autodesk Inventor Professional 2016.

1.Start a sketch on the part face using one of these methods to start a new sketch

• On the ribbon, click 3D Model tab  Sketch panel  Create 2D Sketch , and then select the part face to sketch on.
• Select the face to sketch on. When the mini-toolbar appears, click the third button on the right labeled with the tooltip, Create Sketch.

• Select the face to sketch on, then right-click and select New Sketch from the marking menu.

The edges of the extrusion are copied to the current sketch.

1. On the ribbon, click Sketch tab  Modify panel  Offset .
2. Select one of the edges, then drag it to the inside, and click to place. All edges highlight and drag. If all the edges do not highlight, right-click and make sure Loop Select and Constrain Offset are checked in the overflow menu, then retry the selection.
   • Enable Loop Select to allow all planar continuous sketch geometry to be selected as a group. Disable to select individual edges.
   • Enable Constrain Offset to apply automatic constraints which allow one offset distance to determine the position for the entire selection. Disable to allow each edge to be dimensioned independently.
3. Start the Dimension command. Dimension the offset geometry 5mm away from a feature edge.
4. Place a horizontal and vertical dimension on the two edges of the offset geometry. The horizontal and vertical dimensions appear in parentheses as reference (driven) dimensions. These dimensions will be used later to extract the spacing in the feature pattern.

Note: If you receive a warning when you dimension the offset sketch geometry, choose Accept to create a driven dimension. This message appears if you did not choose Apply driven dimension in the Application Options  Sketch tab.

1. Finish the Sketch.
2. Click 3D Model tab  Modify panel  Hole , or select Hole from the marking menu. Set the Placement option to From Sketch. Select the lower left vertex in the offset sketch to position the hole. Set the hole diameter to 6 mm and the termination to Through All, then choose OK to create the hole.

The sketch is “consumed” under the hole feature in the browser.

1. To select the 39-mm sketch reference dimensions for the hole pattern spacing, they must be visible. Locate the hole feature in the browser, and click + to expand and show the sketch. Right-click the sketch, and choose Visibility from the context menu.
2. Click 3D Model tab  Pattern panel  Rectangular . The Features selection arrow is selected. Pick the Hole. If you are viewing the hole in a plan view, it is difficult to select the hole on the part. Rotate the view slightly in 3D before selecting the hole on the part. You can also select the hole directly in the Model browser.

Attention: Do NOT select the extruded body, or it will be patterned with the hole.

1. Pick the Direction 1 arrow, and then choose a horizontal edge to set the direction. The edge you choose determines the initial direction.

For example, if you choose the lower model or sketch edge, the horizontal pattern direction is to the left. If you choose the upper model or sketch edge, the horizontal pattern direction is to the right.

Use the Flip direction arrow to reverse the direction. Set the count to two, and then highlight the text in the dimension spacing field. With the text highlighted, select the horizontal sketch dimension to use the dimension value for the spacing. Pick the Direction 2 arrow, and then pick a vertical model or sketch edge. Set the count to two, and then highlight the text in the dimension field. Select the vertical reference dimension to use the dimension value.

1. Click OK to create the pattern. After you create the pattern, right-click Sketch2 in the Model browser, and turn off the sketch Visibility.

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Next section How to make a hole

Projected edges help “anchor” the geometry to the model when no edges are projected. Use the Revolve command to create cylindrical shapes quickly.

1. Expand the Origin folder in the browser, right-click on the YZ Plane, and select New Sketch from the context menu. Turn Visibility on to view the YZ Plane in the graphics screen.

1. Right-click in the graphics window, and select Slice Graphics from the overflow menu, or choose F7 to toggle Slice Graphics on and off.

Navigate to a plan view using the ViewCube (use Right, for example.).

1. Select Project Geometry to copy a parallel model edge to the sketch in the center of the part.

1. Start the Line command and begin to sketch a shape. Start with a vertical line from the midpoint of the projected geometry. A green dot indicates the midpoint.

Tip: An explicit horizontal line on the lower section of the sketch is not required to create a closed shape. Inventor uses Coincident constraints to determine closed boundaries. If the two vertical lines are attached to the projected edge of the sketch with Coincident constraints, there is no need to draw the line.

1. Dimension the sketch as shown in the following image. Apply a Collinear constraint to the outer vertical edges as shown in the following image. It enables both lines to be controlled by the same dimension. All sketch elements change color to indicate that the sketch is fully constrained.

Tip: If the sketch is not fully constrained, one or both of the outside vertical lines are probably not attached to the projected line. Apply coincident constraints to attach the ends (indicated by the arrows in the following image) to the projected line. You can also apply a coincident constraint using a drag operation to connect elements.

1. Finish the sketch.
2. On the Model tab, select the Revolve command. The closed boundary sketch profile you just completed should already be highlighted. If not, select it. Next, the highlighted axis button in the mini-toolbar prompts you to pick an axis to revolve around. Pick the center line.

Tip:

• If you define the axis line as a centerline, Autodesk Inventor selects the axis for you. Define the axis as a centerline to dimension the diameter when you dimension from the centerline to an outer edge.
• To designate the central axis as a sketch centerline, you must be in the Sketch environment. Select the axis, and then choose the centerline icon on the Format panel of the Sketch tab.

Finished shape -