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<strong>Step 8:</strong> Draw a diagonal line from the vertical line to the midpoint of the rectangle's bottom line as shown in the screenshot.

<strong>Step 8:</strong> Draw a diagonal line from the vertical line to the midpoint of the rectangle's bottom line as shown in the screenshot.

TW8

[[File:TW8.png|1500px|none]]

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<strong>Step 9:</strong> Finally, to ensure SolidWorks knows we are creating a closed area, draw a line from the midpoint of the rectangle's bottom line to the edge of the rectangle.

<strong>Step 9:</strong> Finally, to ensure SolidWorks knows we are creating a closed area, draw a line from the midpoint of the rectangle's bottom line to the edge of the rectangle.

TW9

[[File:TW9.png|1500px|none]]

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<strong>Step 10:</strong> This next step will be a lot easier if you select the plane and click on the Section View icon at the top of your drawing space. This will allow you to see a cross-section of the square column and select the enclosed area in the sketch easier. Click the green checkmark. SolidWorks often indicates enclosed areas in a sketch with darker shading as shown in the screenshot below (hence the darker triangle that we just drew). While you are here, use the Smart Dimension tool to measure the angle as shown in the second screenshot below. You should get about 35.26 degrees. Remember this angle because we will need it when making cuts on the [[Vertical Wood Bandsaw|wood bandsaw]].

<strong>Step 10:</strong> This next step will be a lot easier if you select the plane and click on the Section View icon at the top of your drawing space. This will allow you to see a cross-section of the square column and select the enclosed area in the sketch easier. Click the green checkmark. SolidWorks often indicates enclosed areas in a sketch with darker shading as shown in the screenshot below (hence the darker triangle that we just drew). While you are here, use the Smart Dimension tool to measure the angle as shown in the second screenshot below. You should get about 35.26 degrees. Remember this angle because we will need it when making cuts on the [[Vertical Wood Bandsaw|wood bandsaw]].

TW10

[[File:TW10.png|1500px|none]]

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<strong>Step 11:</strong> Select the triangular area, go to the Features tab, and click on Extruded Cut. In the left column, check the box for Direction 2 so that the extruded cut is extending both directions out of the reference plane. Click the green checkmark when you are finished.

<strong>Step 11:</strong> Select the triangular area, go to the Features tab, and click on Extruded Cut. In the left column, check the box for Direction 2 so that the extruded cut is extending both directions out of the reference plane. Click the green checkmark when you are finished.

TW11

[[File:TW11.png|1500px|none]]

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<strong>Step 12:</strong> Click the Section View icon again to see the full drawing again. Hold the Shift key and select both the top face and the extruded cut face as shown in the screenshot below.

<strong>Step 12:</strong> Click the Section View icon again to see the full drawing again. Hold the Shift key and select both the top face and the extruded cut face as shown in the screenshot below.

TW12

[[File:TW12.png|1500px|none]]

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<strong>Step 13:</strong> Go to the Features tab and click the drop-down arrow under Linear Pattern. Click on Circular Pattern. With any luck, both the Boss Extrude and the Cut Extrude will have automatically populated the Features and Faces section in the left column. Choose the Pattern Axis as the edge of the square column that is opposite the Cut Extrude that we performed in a previous step. There's more than one way to get the correct number of instances and spacing. In this example, I chose 4 instances equally spaced over 360 degrees. When everything looks good, click the green checkmark.

<strong>Step 13:</strong> Go to the Features tab and click the drop-down arrow under Linear Pattern. Click on Circular Pattern. With any luck, both the Boss Extrude and the Cut Extrude will have automatically populated the Features and Faces section in the left column. Choose the Pattern Axis as the edge of the square column that is opposite the Cut Extrude that we performed in a previous step. There's more than one way to get the correct number of instances and spacing. In this example, I chose 4 instances equally spaced over 360 degrees. When everything looks good, click the green checkmark.

TW13

[[File:TW13.png|1500px|none]]

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<strong>Step 14:</strong> Select the Top Plane in the Design Tree and start a new sketch by going to the Sketch tab and clicking Sketch. It also helps to be "Normal To" your sketching plane; you can find that icon by clicking on the Top Plane in the Design Tree. On the Sketch tab, click the drop-down arrow next to the rectangle and choose Center Rectangle. Draw a rectangle centered on the origin by clicking on the origin and dragging. Check the "For Construction" box in the left column before clicking the green checkmark. Use the Smart Dimension tool to make the rectangle a square with sides at 10/16 inch.

<strong>Step 14:</strong> Select the Top Plane in the Design Tree and start a new sketch by going to the Sketch tab and clicking Sketch. It also helps to be "Normal To" your sketching plane; you can find that icon by clicking on the Top Plane in the Design Tree. On the Sketch tab, click the drop-down arrow next to the rectangle and choose Center Rectangle. Draw a rectangle centered on the origin by clicking on the origin and dragging. Check the "For Construction" box in the left column before clicking the green checkmark. Use the Smart Dimension tool to make the rectangle a square with sides at 10/16 inch.

TW14

[[File:TW14.png|1500px|none]]

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<strong>Step 15:</strong> Draw four circles--one centered on each corner of the construction square. Use the Smart Dimension tool to set the diameter of each circle at 1/2 inch.

<strong>Step 15:</strong> Draw four circles--one centered on each corner of the construction square. Use the Smart Dimension tool to set the diameter of each circle at 1/2 inch.

TW15

[[File:TW15.png|1500px|none]]

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<strong>Step 16:</strong> On the Features tab, click the Extruded Cut to create the four drilled holes. There's room for creativity here in choosing the depth of your drilled holes because the depth of the hole directly affects the frequency at which it resonates. For now, set the depth of all four holes to 4 7/16 inches (4.4375 inches).

<strong>Step 16:</strong> On the Features tab, click the Extruded Cut to create the four drilled holes. There's room for creativity here in choosing the depth of your drilled holes because the depth of the hole directly affects the frequency at which it resonates. For now, set the depth of all four holes to 4 7/16 inches (4.4375 inches).

TW16

[[File:TW16.png|1500px|none]]

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<strong>Step 18:</strong> The easiest way to make to make the drilled holes different depths is to use the Convert Entities function under the Sketch tab. Orient the train whistle such that you can see down the drilled holes from the top. Click on the circular section at the bottom of the hole and click on Cut Extrude to indicate to SolidWorks that you would like to make another change to this sketch. Click on Convert Entities in the Sketch tab. This process basically takes a feature and creates a new sketch out of it, so keep an eye on your design tree as you go. Then you can click on the Cut Extrude function again on the Features tab to cut deeper into the train whistle an additional 4 6/16 inches (4.375 inches) for a total of 8 13/16 inches. This hole depth will attempt to produce a G4 note.

<strong>Step 18:</strong> The easiest way to make to make the drilled holes different depths is to use the Convert Entities function under the Sketch tab. Orient the train whistle such that you can see down the drilled holes from the top. Click on the circular section at the bottom of the hole and click on Cut Extrude to indicate to SolidWorks that you would like to make another change to this sketch. Click on Convert Entities in the Sketch tab. This process basically takes a feature and creates a new sketch out of it, so keep an eye on your design tree as you go. Then you can click on the Cut Extrude function again on the Features tab to cut deeper into the train whistle an additional 4 6/16 inches (4.375 inches) for a total of 8 13/16 inches. This hole depth will attempt to produce a G4 note.

TW18

[[File:TW18.png|1500px|none]]

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<strong>Step 19:</strong> Pick a different hole and perform the same Convert Entities and Cut Extrude steps to set the depth of the next hole. Add an additional 2 9/16 inches (2.5625 inches) to the hole depth for a total of 7 inches. This hole depth will attempt to produce a B4 note (the major third in a G-major triad). If--instead--you would like to create a G-minor triad, set the additional cut extrude depth to 3 inches for a total of 7 7/16 inches. This hole depth will attempt to produce a Bb4 note.

<strong>Step 19:</strong> Pick a different hole and perform the same Convert Entities and Cut Extrude steps to set the depth of the next hole. Add an additional 2 9/16 inches (2.5625 inches) to the hole depth for a total of 7 inches. This hole depth will attempt to produce a B4 note (the major third in a G-major triad). If--instead--you would like to create a G-minor triad, set the additional cut extrude depth to 3 inches for a total of 7 7/16 inches. This hole depth will attempt to produce a Bb4 note.

TW19

[[File:TW19.png|1500px|none]]

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<strong>Step 20:</strong> Pick a third hole and perform the same Convert Entities and Cut Extrude steps to set the depth of the next hole. Add an additional 1 1/2 inches (1.5 inches) to the hole depth for a total of 5 15/16 inches. This hole depth will attempt to produce a D5 note (the fifth of the G-major triad). We will leave the fourth hole's depth at its original 4 7/16 inches because this will attempt to produce a G5 note (one octave up from G4). It's difficult to tell if each Cut Extrude produced the intended result, but you can change the view using the Display Style icon shown in the screenshot. By looking at the sideview of our train whistle, we can see that we have four different hole depths. If you would like to check your work, you can select the Evaluate tab and click on the Measure tool. By clicking on the top and the bottom of the drilled holes, SolidWorks will return the length or "minimum distance" between the two points/features. Now pat yourself on the back; you've completed part 1 of 3. But don't worry, the other two parts will be relatively simple.

<strong>Step 20:</strong> Pick a third hole and perform the same Convert Entities and Cut Extrude steps to set the depth of the next hole. Add an additional 1 1/2 inches (1.5 inches) to the hole depth for a total of 5 15/16 inches. This hole depth will attempt to produce a D5 note (the fifth of the G-major triad). We will leave the fourth hole's depth at its original 4 7/16 inches because this will attempt to produce a G5 note (one octave up from G4). It's difficult to tell if each Cut Extrude produced the intended result, but you can change the view using the Display Style icon shown in the screenshot. By looking at the sideview of our train whistle, we can see that we have four different hole depths. If you would like to check your work, you can select the Evaluate tab and click on the Measure tool. By clicking on the top and the bottom of the drilled holes, SolidWorks will return the length or "minimum distance" between the two points/features. Now pat yourself on the back; you've completed part 1 of 3. But don't worry, the other two parts will be relatively simple.

TW20

[[File:TW20.png|1500px|none]]

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