SolidWorks 2010- P13 ppt

Chapter 9 Modeling Parts Within an Assembly Create the Shade Subassembly  Create an In-Context Model  Finish the Shade Model  Finish the Shade Subassembly  Add Configurations to an Assembly  505434c09.indd 329 1/26/10 2:43:37 PM Chapter 9 • Modeling Parts Within an Assembly 330 S ometimes when creating parts for an assembly, it is difficult to anticipate changes that will be made to the various components and how they will affect other components in the assembly. So far, you have created all the components for the desk lamp separately, and then you built subassem- blies from them. This is often referred to as bottom-up design. One drawback to this approach is that as a component in the desk lamp is updated, it may be necessary to manually make the changes to other components. In this chapter, you will be using a different approach when you create the model for the shade. Instead of making the shade as a separate model and insert- ing it into the subassembly, you will be creating the model from within a subas- sembly. By modeling the shade from within an assembly, as any components in the assembly are updated, any required changes will automatically be applied to the shade. Create the Shade Subassembly Before you can create the shade, you need to begin building the shade subassem- bly. The base part of the assembly will be the shade mount model you created in the previous chapter. The washer subassembly that you created in Chapter 7 will also be used in this assembly. If you have not completed the models in the previ- ous chapters, you can always download them from the companion site. In addi- tion to the parts and subassemblies from the previous chapters, you also need to download a couple of models in order to complete the shade subassembly. Once you have downloaded all the necessary models for this chapter, you can begin building a new assembly using the following steps: 1. Click New in the menu bar, and select Assembly in the New SolidWorks Document window. Click OK to create a new assembly model. 2. Click Browse in the Begin Assembly PropertyManager. 3. Browse to the folder that contains the shade mount, which is the Desk Lamp.sldprt file created in Chapter 8, and select the model. Click the Open button. 4. Instead of placing the part and using mates to fix its location in the 3D environment, you’ll accept its default location. Since this is the first component being inserted into the assembly, SolidWorks can automati- cally specify the location of the part. Clicking the green check mark in the PropertyManager will specify that the part orientation will match the assembly environment. 505434c09.indd 330 1/26/10 2:43:37 PM Create the Shade Subassembly 331 NOte When building assemblies, at least one component should be fixed in place; otherwise, the entire assembly will be under-defined and will be able to move freely in all six degrees of freedom. This will cause issues with higher-level assemblies and drawings. 5. Update the units in the document properties to display the length dimensions using three decimal places. 6. Save the assembly as Shade Sub-Assy, Desk Lamp.sldasm. Insert the Washer Subassembly Now it is time to add the washer subassembly you created in Chapter 7, “Creating a Simple Assembly Drawing.” By now you have probably become comfortable with the process for inserting components, so we will not need to spend too much time detailing the process. However, you will need two instances of the washer subas- sembly, which will give you the opportunity to explore some more options. Start by inserting the first instance, as described here: 1. In the shortcut bar or the Assembly tab of the CommandManager, select Insert Components. 2. In the Part/Assembly To Insert section of the Insert Component PropertyManager, click the Browse button. 3. Navigate to the folder containing the washer subassembly. If the assembly files are not visible, you may need to specify that the file extension be shown. In the flyout next to the File Name field, select Assembly (*.asm,*.sldasm), as shown in Figure 9.1. FIGURE 9.1 Specifying the file type in the Open window 4. Select the washer subassembly, and click Open. 5. The washer subassembly will be shown next to the mouse pointer. Moving the mouse pointer around, you will notice that the washer 505434c09.indd 331 1/26/10 2:43:39 PM Chapter 9 • Modeling Parts Within an Assembly 332 moves as well. Until you specify an insertion point, the subassembly is technically not part of the assembly. Click anywhere in the graph- ics area to insert the subassembly. Mate the Washer Subassembly Before inserting the next instance of the washer subassembly, you should mate the first instance. Using the concentric and coincident mates, you will be able to almost fully define the position of the washer subassembly. The only degree of freedom that will not be restricted is the rotation around the shaft of the shade mount. This means that the washer subassembly will be free to spin around the shaft, which for this design intent is acceptable. Apply the required mates as described in the following steps: 1. Select the Mate tool in the shortcut bar or the Assembly tab of the CommandManager. 2. Select the inner diameter of the washer assembly, as in Figure 9.2. FIGURE 9.2 Selecting the inner diameter of the washer for mating 3. Select the cylindrical face of the shade retainer shaft, as shown in Figure 9.3. Click the green check mark in the Mate PropertyManager to apply the concentric mate. 4. Select the top face of the washer subassembly, as shown in Figure 9.4. 5. Select the face of the shade retainer, as shown in Figure 9.5. The position of washer subassembly will be updated, as shown in Figure 9.6. If the washer subassembly is not aligned in the manner shown in Figure 9.6, click the Anti-Align button in the Mate PropertyManager. Click the green check mark in the PropertyManager to apply the mate. 505434c09.indd 332 1/26/10 2:43:40 PM Create the Shade Subassembly 333 FIGURE 9.3 Selecting the cylindrical face of shaft for mating FIGURE 9.4 Top face of washer cover selected for mating FIGURE 9.5 Face of shade mount selected for mating 505434c09.indd 333 1/26/10 2:43:43 PM Chapter 9 • Modeling Parts Within an Assembly 334 FIGURE 9.6 Washer subassembly mated to shade mount Insert the Second Instance of the Washer Subassembly Now it is time to add the second instance of the washer subassembly. Luckily, since the subassembly was inserted once, you can eliminate the step of using the Insert Components command. Instead, you will be making a copy of the subassembly without the use of any command. There are a couple of ways to create copies of parts and subassemblies in an assembly, but this time you will use our most-used procedure. Doing the following will create a copy that you can then mate: 1. Select the washer subassembly in the FeatureManager design tree by pressing and holding the left mouse button. While still holding the left mouse button, press the Ctrl key on your keyboard, and move the mouse pointer into the graphics area. A new instance of the washer subassem- bly will be inserted into the assembly. To insert the new instance into the assembly, release the left mouse button before releasing the Ctrl key; otherwise, the new instance will not be created. tIp You can use the Ctrl key to create copies of parts in the graphics area by clicking and dragging a part in the graphics area while holding down the key on your keyboard. 2. Mate the second instance of the washer subassembly just as you did with the first instance. When mated properly, the two washer subas- semblies should appear as shown in Figure 9.7. Click the green check mark to exit the Mate PropertyManager. 505434c09.indd 334 1/26/10 2:43:45 PM Create an In-Context Model 335 FIGURE 9.7 Both washer subassemblies mated in place Create an In-Context Model In-context models are models that are created in reference to existing geometry in an assembly. Oftentimes, some dimensions of the part relate to other parts in the assembly, and as the referenced geometry is changed, the in-context model will update automatically. As you can imagine, this could be a huge advantage because it eliminates the need to manually update all the parts in an assembly as the design is refined. This is exactly how the shade model will be modeled. The steps described here will enable the overall length of the shade model to automatically update if you decide to change the distance between the arms of the shade mount. If, how- ever, the length of the shade is manually edited in the model itself, the link to the assembly will be broken. To create an in-context model, do the following: 1. Select the downward-pointing arrow next to the Insert Components button on the shortcut bar, and select New Part from the flyout. 2. Select the face of the washer, as shown in Figure 9.8, to create a new sketch on the face of the washer. After selecting the face, the rest of the components in the assembly will become transparent. O In-context models eliminate the need to manually update all the parts in an assembly as the design is refined. 505434c09.indd 335 1/26/10 2:43:48 PM Chapter 9 • Modeling Parts Within an Assembly 336 FIGURE 9.8 Selecting the face to insert a sketch for the shade model The new part shown in the FeatureManager will look different from what you have seen up to this point, as shown in Figure 9.9. We will cover the reason for this later in this chapter. FIGURE 9.9 New part displayed in the FeatureManager design tree 3. Select Normal To in the Heads-Up View toolbar, or press Ctrl+8 on the keyboard. 4. Using the Line command and making use of autotransitioning to an arc, duplicate the sketch shown in Figure 9.10. It is important to note the tangencies between the three arcs. NOte Regardless of the orientation of the shade mount, the sketch of the shade must be drawn in the orientation shown. 505434c09.indd 336 1/26/10 2:43:51 PM Create an In-Context Model 337 FIGURE 9.10 Fully defined sketch of the shade component Extrude up to Existing Geometry With the sketch for the shade created and fully defined, it is time to create the base extrusion. You will be using the Extruded Boss/Base command, which has probably become very familiar at this point, but instead of specifying a depth of extrusion, you will reference a face in the assembly to extrude up to. To use the command in this manner, do the following: 1. Select the Isometric view in the Heads-up View toolbar, or press Ctrl+7 on your keyboard. 2. Select Extruded Boss/Base on the Features tab in the CommandManager. 3. In the Direction1 section of the Boss-Extrude PropertyManager, select Up To Surface in the End Condition field. 4. Select the face of the washer on the other side of the shade mount, as shown in Figure 9.11. 505434c09.indd 337 1/26/10 2:43:55 PM Chapter 9 • Modeling Parts Within an Assembly 338 FIGURE 9.11 Terminating the face of the shade model NOte Terminating the extrusion of the shade on the face of the oppos- ing washer subassembly will allow the extrusion to adjust to any changes in the distance between the two sets of washers. 5. The preview in the graphics area, as shown in Figure 9.12, will show the shade extending from the sketch and terminating on the other washer. If the distance between the two is updated in the shade mount model, the length of the shade will automatically be updated. Click the green check mark to create the shade. FIGURE 9.12 Preview of shade base extrusion 505434c09.indd 338 1/26/10 2:44:00 PM [...]... washers to specify the length of the extrusion F i g u r e   9 1 3  ​ Virtual component in the FeatureManager design tree A bout Vi r tual Com ponents Virtual components are a fairly recent addition to SolidWorks They allow you to save a component inside the assembly itself without externalizing the component This makes the model exist only in the assembly and not as a part that can be opened separately... Plane item that is a child of the shade subassembly in the FeatureManager 353 10 You may receive an error message saying that the default mate would over-define the assembly When selecting two planes, SolidWorks assumes that you are attempting to add a coincident mate but in this case that particular mate is impossible with the current set of mates that have been applied to the bulb receptacle (Figure 9.32)... 1 Click the ConfigurationManager tab at the top of the FeatureManager design tree, as shown in Figure 9.33 F i g u r e   9 3 3  ​ Selecting the ConfigurationManager tab O When selecting two planes, SolidWorks assumes that you are attempting to add a coincident mate 354 Chapter 9 • Modeling Parts Within an Assembly 2 Right-click while the mouse pointer is inside the ConfigurationManager but not... attempted to add a mate to the shade that will change the angle to 10°, it would over-define the assembly The reason for this is that the Parallel mate you added fully defined the position of the shade, and SolidWorks would not be able to determine how the additional mate should be applied Before you can add a mate to adjust the angle, you need to suppress the Parallel mate Suppressing a feature, or in this . assembly using the following steps: 1. Click New in the menu bar, and select Assembly in the New SolidWorks Document window. Click OK to create a new assembly model. 2. Click Browse in the Begin. accept its default location. Since this is the first component being inserted into the assembly, SolidWorks can automati- cally specify the location of the part. Clicking the green check mark in. design tree About Vi r t u A l Co m p o n e n t s Virtual components are a fairly recent addition to SolidWorks. They allow you to save a component inside the assembly itself without externalizing