Modeling a CPU case. Lesson 5. This tutorial illustrates how to create the external case of a Central Processing Unit using the following commands.

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Bernice Flowers
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1 Modeling a CPU case Lesson 5 Modeling a CPU case This tutorial illustrates how to create the external case of a Central Processing Unit using the following commands. NURBS curves. Pipe. NURBS surface editing. Trim. Edge extract. Snap to Point / Snap in 3D. Coons. Learning solidthinking 1

2 Lesson 5 You will start modeling by drawing the base curves. Building the case 1) If you are already working with solidthinking, choose the New command from the File main menu and save the scene you were working on. Otherwise, you must first run solidthinking. 2) Choose the default layout option from the Layouts panel (choose View 4 Layouts). 2 Learning solidthinking

3 Modeling a CPU case 3) Select the NURBS curve tool and create a curve in the Front view for the frontal profile of the workstation. Insert 0,0,0 as default Local axes origin (use the image below for reference guide). Try to keep as few control points as you possibly can. For your convenience, we provide herewith points coordinates: #1(-5, 0, 0); #2(-5, 0, 3); #3(-4.4, 0, 3); #4(-4.4, 0, 4); #5(-4.4, 0, 13); #6(-3, 0, 14); #7(-2, 0, 14). 4) Select the NURBS curve tool and create a curve in the Top view for the upper profile of the workstation. Insert 0,0,0 as default Local axes origin and use the image below as reference guide. Just as before, try to keep as few control points as you possibly can. Learning solidthinking 3

4 Lesson 5 Points coordinates are: #1(-5, 12, 0); #2(-5, 11, 0); #3(-5, 0, 0); #4(0, -2, 0); #5(5, 0, 0); #6(5, 11, 0); #7(5, 12, 0). The curves you have created should be similar to those in the below figure. 4 Learning solidthinking

5 Modeling a CPU case 5) Click the Pipe icon. Then, click the front profile curve, followed by the top profile curve. Note: if the surface you have just attained is slightly different from the one shown in the figure, you just need to act on the two curves that have generated the surface (the Construction Curves). Just click the Edit Mode icon in the Application Toolbar and drag the curves points with the mouse: solidthinking will adjust the surface accordingly. 6) To create the front part of the workstation, select now the surface and click the NURBS surface editing icon. An alert panel warns you: The selected surface is part of a Construction Tree. In order to edit with this Modeling Tool, the surface needs not to be a part of the Construction Tree. Do you want the surface to be set as hidden and a copy to be created for editing? Click Yes to confirm your choice. Note: When you apply the NURBS Surface Editing action, the Construction Tree is broken. The original parametric surface is hidden from the 3D views but still displayed in the browser. The newly created NURBS surface is NOT linked in any way to the original parametric one. Learning solidthinking 5

8) Hold down the mouse button and drag in the view to select any point included in a selection box.

6 Lesson 5 Thus, modifying the shape of the original parametric surface will NOT cause the NURBS surface to change its shape accordingly. 7) Now click the Edit Mode icon in the Application Toolbar. 8) Hold down the mouse button and drag in the view to select any point included in a selection box. You can keep the. Ctrl key pressed to add any ulterior points to the first selection. 6 Learning solidthinking

7 Modeling a CPU case Note: you will probably make the selection of points easier by simply orbiting the camera in the Perspective View. 9) Disable X and Y and click the Translation tool to move the points downward. Once moved, deselect all of them and go on moving only those needed to get your final shape. Note: getting a surface identical to the one below is unnecessary; the issue here is understanding how the command works. Let s now move to the upper side. This area is not flat as it may appear, but rather puffed up. 10) Select the points, switch to Edit Mode and Translate the points onto the Z axis. You will so get a lightly rounded surface. Learning solidthinking 7

8 Lesson 5 Here is the surface viewed in Shade mode (Perspective window) after the translation of the points upwards. You can now distinguish its actual shape. 8 Learning solidthinking

Modeling a CPU case Creating a slot Let s now see how to create a simple slot. 1) Enable now X and Y dragging. 2) Click the Front View and then click the NURBS curve icon.

9 Modeling a CPU case Creating a slot Let s now see how to create a simple slot. 1) Enable now X and Y dragging. 2) Click the Front View and then click the NURBS curve icon. Draw a curve as illustrated below: Points coordinates are: #1(-1, 0, 2); #2(-1, 0, 1); #3(-1, 0, 0); #4(0, 0, 0); #5(1, 0, 0); #6(1, 0, 1); #7(1, 0, 2). This curve will now be used to trim the surface. 3) Click the Trim icon and, first, select the curve to cast, and then the surface. The outcome should be as depicted in the following figure Learning solidthinking 9

10 Lesson 5 Note: The Trim modeling tool allows you to determine the area of the surface you want to keep. In the Modeling Tool panel, just switch on the chosen radio button to specify if you want to Keep exterior or to Trim exterior. 10 Learning solidthinking

Modeling a CPU case You now need to close the trim hole. 4) With the trimmed surface selected, use the Copy and Paste command to create a copy of the object.

11 Modeling a CPU case You now need to close the trim hole. 4) With the trimmed surface selected, use the Copy and Paste command to create a copy of the object. Note: the World Browser will emphasize the duplication of the object by adding a new object to the list. 5) Select again the original trimmed surface (not the copy) in the World Browser and, in the Modeling Tool panel, enable Trim exterior in the Loop exterior section to highlight the inner portion. Learning solidthinking 11

12 Lesson 5 Closing up the case To create the lid, we must extract the necessary curves. 1) Click the Edge extract icon and click the left border to extract it. Do the same with the right one. You will so obtain two separate curves. The figure below shows you the edges to be extracted. 12 Learning solidthinking

Modeling a CPU case Note: You will find it easier executing Edge extract in the Perspective view. 2) Do the same to extract the edge relative to the frontal portion. Refer to the below image.

13 Modeling a CPU case Note: You will find it easier executing Edge extract in the Perspective view. 2) Do the same to extract the edge relative to the frontal portion. Refer to the below image. You now have three profiles. You are only missing the fourth and then you will build the surface that will close up the cpu case. 3) Select Edit 4 Active Snap 4 Point and Edit 4 Active Snap 4Snap in 3D. The active snaps will allow you to create a precise curve. Learning solidthinking 13

5) We will now use the Coons surface creation tool, which creates a surface blended between four boundary curves.

14 Lesson 5 4) Click the Top View and then click the NURBS curve icon to create the fourth and last curve. Confirm the default Local axes origin (0,0,0) and click the two points indicated in the figure below. 5) We will now use the Coons surface creation tool, which creates a surface blended between four boundary curves. Click the Coons icon and then pick the four curves (1, 2, 3, 4) which define the perimeter of the surface to be created making sure to select them consecutively Learning solidthinking

15 Modeling a CPU case Once you have completed this last surface, your CPU case is ready. We encourage you to repeat it a few more times or, at least, until you will feel more confortable with the concepts and commands explained up this point. Learning solidthinking 15

16 Lesson 5 16 Learning solidthinking

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