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→Procedure
===Fipple Block===
===Fipple Block===
<strong>Step 21:</strong> Begin a new SolidWorks part for the fipple block. Ensure your units in the bottom right corner are IPS. Begin a sketch in the top plane and draw a circle that is centered on the origin. Use the Smart Dimension tool to set the circle's diameter to 1/2 inch.
<strong>Step 21:</strong> Begin a brand new SolidWorks part for the fipple block (meaning don't build this part in the same screen that you built the train whistle body). Ensure your units in the bottom right corner are IPS. Begin a sketch in the top plane and draw a circle that is centered on the origin. Use the Smart Dimension tool to set the circle's diameter to 1/2 inch.
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<strong>Step 22:</strong> Draw a construction line from the top-most point of the circle through the origin. Use the Smart Dimension tool to set the length of this line to 3/8 inch (0.375 inch).
<strong>Step 22:</strong> Draw a construction line from the top-most point of the circle through the origin. Use the Smart Dimension tool to set the length of this line to 3/8 inch (0.375 inch). Remember this dimension (3/8 inch) when you are creating a flat spot on the wooden dowel that will become your fipple block. You can measure this with calipers.
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<strong>Step 26:</strong> You should have a flattened dowel like the one shown in the screenshot below.
<strong>Step 26:</strong> You should have a flattened dowel like the one shown in the screenshot below. Congrats! You've completed part 2 of 3. Save your work.
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TW26
===Mouthpiece===
===Mouthpiece===
<strong>Step 21:</strong> .
<strong>Step 27:</strong> Begin a brans new SolidWorks part for the mouthpiece. Ensure your units in the bottom right corner are IPS. Begin a sketch in the top plane and draw a center rectangle that is centered on the origin. Use the Smart Dimension tool to make this rectangle a square with sides of 1.5 inches.
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<strong>Step 28:</strong> Draw a circle centered on the origin with a diameter of 1 3/8 inches (1.375 inches). Use the Smart Dimension tool to set the diameter. Remember this diameter because this will be the size of the Forstner bit that we use to cut part-way through the mouthpiece.
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<strong>Step 29:</strong> Draw another circle centered on the origin with a diameter of 1/2 inches. Use the Smart Dimension tool to set the diameter.
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<strong>Step 22:</strong> .
<strong>Step 30:</strong> Go to the Features tab and click on Extrude Boss/Base. SolidWorks will need help determining which contours you would like to be extruded. Select the two outer enclosed areas, but do not select the area inside of the 1/2-inch circle. When you are finished, click the green checkmark.
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<strong>Step 23:</strong> .
<strong>Step 31:</strong> For this next step to work, you must go to the design tree, drop down the arrow next to the Boss-Extrude (created in the previous step), click on the Sketch icon, and click on the eyeball icon to show the sketch. With the sketch visible, select the larger circle and click on Extruded Cut. You may need to change the direction of extruded cut by clicking the Reverse Direction icon in the left column. Set the depth to 3/8 inch (0.375 inch). Click the green checkmark when you are finished. We've managed to do a neat trick here that creates two separate and unique features from a single sketch. The second screenshot below shows the results of the extruded cut as viewed from underneath. Yay! You've completed part 3 of 3. Save your work.
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