SolidWorks 2010- P6

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SolidWorks 2010- P6

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SolidWorks 2010- P6: Whether you are a new user of SolidWorks or a professional who wants to improve your skills, this book was written for you. Learning any software can be difficult at times. You launch the software for the first time, and you feel overwhelmed, not knowing how to even start a new document. In 3D CAD programs, it can be especially difficult. Many times a whole new vocabulary and a whole new creative environment are introduced.

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1. Core Out the Part 119 F i g u r e 3 . 4 8 Defining the bottom wall thickness of the cutout 3. Do the same on the two vertical rectangle segments that are closest to the part edges. 4. Now all that is left is to define the height of the cutout. Select one of the two segments on the side of the rectangle, and place the dimen- sion. Set the height of the rectangle to be 2 inches in the Modify win- dow, as shown in Figure 3.49. F i g u r e 3 . 4 9 Fully defined sketch of the cutout 5. Exit the sketch by clicking the Exit Sketch button in the confirma- tion corner. Cut Out the Cavity Since you started the process by clicking the Cut-Extrude button prior to cre- ating the sketch of the cutout, when the sketch was exited, the Extruded Cut command automatically initiated. This approach reduces the number of mouse clicks and in the long run will save you time while you are modeling, which is always a good thing.
2. 120 C h a p t e r 3 • C r e a t i n g Yo u r F i r s t P a r t 1. Press Ctrl+7 on your keyboard, or select the isometric view in the Heads-up View toolbar. 2. In the Extrude PropertyManager, set the depth of the extrusion to be 1.00 inch deep, and click the green check mark to complete the action, as shown in Figure 3.50. F i g u r e 3 . 5 0 Setting the depth of extrusion in the Extrude PropertyManager 3. Press Ctrl+S on your keyboard or press the Save button on the menu bar to save the changes you have made to the model. Figure 3.51 shows an isometric view of the model so far. F i g u r e 3 . 5 1 Part model showing a rectangular-shaped cavity cut out from the bottom Add Cutout for electronics Cover When the lamp is manufactured and in use, the electronics and wiring will be housed in the cavity and cannot be allowed to just fall out. This could be a huge issue for the consumer, not to mention a hazard. This is why you need to add a
3. Core Out the Part 121 cutout that a small plastic cover will sit in. The cutout has to be recessed since this is the side of the base that will ultimately be placed on a desktop, and if it is above the surface of the base, the base will tilt to one side and be very unstable. To add the cutout, do the following: 1. Press Ctrl+6 or select the bottom view in the Heads-up View toolbar. 2. Press S on the keyboard, and select Cut-Extrude in the shortcut bar. 3. Select the bottom face of the lamp base model to insert a blank sketch. 4. Since the cutout for the cover will follow the outline of the cavity cutout, you’ll offset the edge rather than create a new rectangle. Press S on the keyboard, and select the Offset Entities button on the shortcut bar. The Offset Entities command allows you to create sketch entities that are offset by a specified distance from existing sketch entities, model edges, or model faces. Using the Offset Entities tool, you’ll off- set the edges of the cavity you created earlier to ensure that the geom- etry for the cover cutout will be updated as dimensions are changed. 5. In the Offset Distance field in the PropertyManager, enter the value .1. This is the distance a line will be created from the edge of the cavity. 6. Ensure that the Add Dimensions option is selected in the PropertyManager. Without this option selected, the newly created sketch entities will not be defined. Also, make sure that the other selected options shown in the previous image are selected. 7. In the graphics area, select the bottom face of the cavity to offset the four edges by the specified dimension.
4. 122 C h a p t e r 3 • C r e a t i n g Yo u r F i r s t P a r t 8. Click the green check mark to exit the command and create the off- set, shown in Figure 3.52. F i g u r e 3 . 5 2 Creating an offset entity The lines that are created by the Offset Entities command take on the Offset Entities relation, eliminating the need for additional relations such as Horizontal or Vertical since these relations should have been applied to the original edges. Also, by selecting the Add Dimensions option in the PropertyManager, you’re able to create a fully defined sketch without the need to add more dimensions. With the sketch fully defined, all that is left to do is to create the extruded cut. 9. By clicking the Extruded Cut command prior to creating the sketch, you eliminated a couple of extra steps. Once the sketch is complete, click the Exit Sketch icon in the confirmation corner to initiate the Extruded Cut command. 10. In the Depth field in the PropertyManager, enter the value of .1, and make sure that the Blind end condition is selected. Since these are the only options you need for this feature, click the green check mark to make the cut. Figure 3.53 shows the part model with the offset entity. F i g u r e 3 . 5 3 Part model showing extruded cut to use for cover cutout
6. 124 C h a p t e r 3 • C r e a t i n g Yo u r F i r s t P a r t The easiest way to do this is to create a circle and specify the circle diameter in the sketch. 4. Press S on your keyboard, and select the Circle button in the shortcut bar. Press Ctrl+8, or select Normal To in the Heads-up View toolbar. 5. To ensure that the circle drawing in the sketch is concentric with the boss, you will specify that the center of the circle shares the same cen- ter point of the boss. Without clicking the mouse button, hover over the edge of the boss with the mouse pointer until the four quadrants of the circle are shown with small yellow diamonds and the center is displayed with a small circle with a cross, as shown in Figure 3.55. F i g u r e 3 . 5 5 Drawing a circle concentric with the boss 6. Move the mouse pointer over the center mark for the boss, and press and release the left mouse button. 7. Drag the mouse slowly from the center point to create the circle. When the radius value displayed next to the mouse pointer shows the R value to be somewhere close to 0.500, click and release the left mouse button, as shown in Figure 3.56. 8. Press the S key, and click the Smart Dimension button in the shortcut bar. 9. Select the circumference of the circle with the mouse pointer, and click and release the left mouse button. Place the dimension on the outside of the circle, and enter 1 in the field of the Modify window. If you properly selected the center of the circle, the circle will be shown as black after applying the dimension, since the location and size of the circle will be fully defined, as shown in Figure 3.57.
7. Core Out the Part 125 F i g u r e 3 . 5 6 Drawing the circle, continued F i g u r e 3 . 5 7 Fully defined concentric circle The sketch with the 1.00≤ circle is what will become the counterbore that makes room for the shaft nut. When the lamp is assembled, the threaded end of the shaft will be held into place securely fastened to the lamp base with a nut. execute an extruded Cut for the Counterbore Now it is time to create the actual extruded cut feature that will become the counterbore. Here’s how: 1. Click the Close Sketch icon in the confirmation corner in the upper- right corner of the graphics area. Once the sketch is exited, the Extruded Cut command will automatically be initiated. To make the next couple of steps easier, press Ctrl+7 on your keyboard to switch to an isometric view. 2. In yet another example of design intent dictating the modeling of fea- tures, instead of creating a blind extrusion, you will create the feature
8. 126 C h a p t e r 3 • C r e a t i n g Yo u r F i r s t P a r t to ensure that a specified wall thickness is met. To do this, you will need to select another end condition in the PropertyManager for the Extruded Cut command. Click the End Condition field to display the available ways to terminate the feature. 3. To ensure that the wall thickness is properly specified, select the Offset From Surface option in the End Condition field. 4. Although you should not have to select it, you should at least be aware that the Face/Plane field in the PropertyManager is highlighted and expecting the selection from the graphics area, as shown in Figure 3.58. F i g u r e 3 . 5 8 Face/Plane field in PropertyManager The Face/Plane field, when using the Offset From Surface end con- dition, is the one that will be used to create the theoretically offset terminating plane for the feature created. Select the top face of the boss at the top of the lamp base, as in Figure 3.59. 5. The Offset Distance setting must now be specified in the PropertyManager. As with the Face/Plane field, you should not have to select the field in order to input the value since it should automatically gain focus after specifying the face of the boss. In the Offset Distance field, enter the value .125 to represent the thickness
9. Core Out the Part 127 of material that will be spared after creating the cut, as shown in Figure 3.60. After entering the value, click the green check mark to create the extruded cut. F i g u r e 3 . 5 9 Specifying the face for the Extruded Cut offset F i g u r e 3 . 6 0 Offset Distance field in PropertyManager The last feature was the counterbore that will be used for the shaft nut. Now you need to create the hole that allows the shaft to mount to the lamp base. Create the Through Hole for the Lamp Shaft This feature, like the counterbore, will be defined with another sketch of a circle with the diameter specified in order to ensure that the shaft will fit properly in place. At this point, you can also switch the view display back to Shaded With Edges since it will no longer be necessary to see the hidden lines of the model.
10. 128 C h a p t e r 3 • C r e a t i n g Yo u r F i r s t P a r t 1. Once again, press S on your keyboard, and click the Extruded Cut command in the shortcut bar. This time, select the top face of the boss to insert a sketch for the extruded cut, as shown in Figure 3.61. F i g u r e 3 . 6 1 Selecting a face on which to draw the sketch 2. While in the sketch, open the shortcut bar, and click the Circle command. 3. Display the center mark for the edge of the boss by hovering over the edge with the mouse pointer. Specify that the center point of the circle will share the center point with the boss, as in Figure 3.62. F i g u r e 3 . 6 2 Creating the concentric circle for the thru hole 4. Create the circle, and specify the diameter to be .7, as in Figure 3.63. Exit the sketch to initiate the Extruded Cut command.
11. Core Out the Part 129 F i g u r e 3 . 6 3 Setting the diameter of the circle 5. In the Extruded Cut PropertyManager, change the end condition of the feature to be Up To Next. This will terminate the hole on the next face it encounters, which in the case would be the terminating face of the counterbore. 6. Click the green check mark to create the hole. The boss with a hole for the lamp shaft is shown in Figure 3.64. F i g u r e 3 . 6 4 Boss with a hole big enough for a lamp shaft Last but not least is the hole for the AC power cord in the back of the lamp base.
12. 130 C h a p t e r 3 • C r e a t i n g Yo u r F i r s t P a r t Create a Through Hole for the AC Power Cord Even though you will not be going as far as creating the power cord or even the grommet that is snapped into the hole to protect the cord, you should still make sure that the features on this lamp base are as accurate as possible. At a later date when you become more comfortable with modeling parts in SolidWorks, it would be great practice to design these components to finish your assembly. Here’s how to make that hole: 1. Click the Extruded Cut command in the shortcut bar, and select the back face of the lamp base to insert a sketch for the hole. 2. Press Ctrl+8 on your keyboard to change the view to be normal to the viewing plane. 3. With the sketch mode active, select the Circle tool in the shortcut bar. 4. Create a small circle in the lower-left area of the face, and apply a dimension to the circle by selecting the Smart Dimension tool in the shortcut bar, as shown in Figure 3.65. Make the Diameter of the circle .400 by entering the value in the Modify window. F i g u r e 3 . 6 5 Drawing a circle on the back face of the model In the future revisions, it may be necessary to specify a new diam- eter for the hole created for the power cord. Since you want to ensure that the distance between the bottom edge of the part and the edge of the hole will always remain the same regardless of the hole diam- eter, you will specify the gap between the edges rather than to the center of the circle. 5. From the shortcut bar, select the Smart Dimension. 6. Instead of just selecting the circle to dimension to the center, press and hold the Shift button on the keyboard while selecting the bottom quadrant of the circle. This will specify that you are actually dimen- sioning the edge of the circle, as shown in Figure 3.66.
13. Core Out the Part 131 F i g u r e 3 . 6 6 Selecting a circle while holding Shift to dimension to its tangent 7. While still holding the Shift key, select the bottom edge of the part, and place the dimension. Specify the distance to be .300 in the Modify window. 8. While the Smart Dimension tool is still active, select the circle once again, and select the sketch origin. 9. Place the dimension and specify that the center of the circle will be 2.00 inches from the sketch origin, as shown in Figure 3.67. F i g u r e 3 . 6 7 Circle with defined diameter, distance from sketch origin, and distance from bottom edge 10. Once the sketch is fully defined, click the Exit Sketch icon in the con- firmation corner. 11. In the Extruded Cut PropertyManager, change the End Condition field to Up To Next, and click the green check mark. Figure 3.68 shows the lamp base with the newly created holes. F i g u r e 3 . 6 8 Solid part with holes added
14. 132 C h a p t e r 3 • C r e a t i n g Yo u r F i r s t P a r t Add Fillets and Chamfers The main modeling of the lamp base is now complete, but the part is not yet ready to be manufactured. Even though the shape and size meet the require- ments of the assembly, all the edges are considered sharp and not very appealing to the consumer. To finish the model, you need to add some chamfers and fillets to the many sharp edges to soften up the final look and in some cases make the part easier to manufacture. In many designs, a fillet is used to add an overall softer appearance to a part, and it is rare that a part not utilize a fillet in one way or another. A fillet is often an edge of a part that is rounded to a specified radius. Depending on whether the fillet is on the outside or inside corner, the manufacturing process will dif- fer, but the process in SolidWorks is the same. A chamfer is is used a lot less often in consumer products because it is not as “soft” as a fillet, but removing the edge is the same. A chamfer is used to break a sharp edge with an angled edge, often 45° at a specified distance. In the lamp base, you will be using both fillets and chamfers, but how you choose which type to use will mostly depend on the function. For example, you can use fil- lets to soften the look of a part or make it easier to machine inside corners, but you can also use chamfers to create lead-in chamfers. Especially when it is necessary to insert a part into another part, lead-in chamfers make it easier for the person doing the assembly to quickly find the hole. Add Fillets using FilletXpert You’ll start by adding fillets to the four corner edges of the lamp base. Even though you can individually select each of the four edges separately, you will use the little used FilletXpert to help in edge selection to save time. To use FilletXpert, do the following: 1. Press S on the keyboard, and select the Fillet tool in the shortcut bar. 2. In the PropertyManager, instead of selecting each edge in the Items To Fillet section, click the FilletXpert button located near the top. N O t e The FilletXpert has a number of features that aid in the creation of fillets. The reason for using the FilletXpert in this case is to quickly cre- ate multiple fillets. This, in my opinion, is one of the best reasons for using the FilletXpert—it is an amazing time-saver, especially in larger parts.
15. Add Fillets and Chamfers 133 3. With the Edges, Faces, Features, And Loops selection box in the PropertyManager selected, click one of the four outside edges of the lamp base in the graphics area. 4. After selecting the edge, a context toolbar will pop up next to the mouse pointer allowing you to specify which edge combination the fillets will be applied. Hovering the mouse pointer over each button on the toolbar will highlight the potentially selected edges on the part and will also display a tooltip explaining the selection set. For this particular fillet, the outside four edges need to be filleted. Click the Connected To End Loop button on the toolbar that shows these edges highlighted, as in Figure 3.69. The four selected edges will be displayed in the PropertyManager. F i g u r e 3 . 6 9 Selecting the edges to be filleted 5. In the Radius field in the Items To Fillet section of the PropertyManager, enter the value .250, and click Apply button.
16. 134 C h a p t e r 3 • C r e a t i n g Yo u r F i r s t P a r t  6. While still in the FilletXpert, select the top edge of the base cre- ated by the angled cut you created earlier in the chapter. Since you With FilletXpert you can apply a fillet are applying the fillet to only one edge, there is no need to select an without exiting the option from the context toolbar. command by click- ing the Apply button 7. In the PropertyManager, specify that the radius of the fillet is 1.00, instead of the green and click the Apply button to move onto the next fillet. check mark. 8. In the PropertyManager, change the radius value to .500, and select one of the top edges of the part. Since all the edges are connected with a curved edge, selecting one will select the top edge. This is called a closed loop, as shown in Figure 3.70. F i g u r e 3 . 7 0 Applying a radius to a closed loop 9. Click the Apply button to continue. 10. Change the radius value to .375, and click the bottom edge of the boss on the top of the base, as shown in Figure 3.71. 11. Click Apply to create the fillet and move onto the next fillet. 12. Set the Radius value to .125, and select the top edge of the boss, as in Figure 3.72.
17. Add Fillets and Chamfers 135 F i g u r e 3 . 7 1 Adding a fillet to the bottom edge of the boss F i g u r e 3 . 7 2 Adding a fillet to the top edge of the boss 13. Since you are finished adding fillets for the time being, click the green check instead of the Apply button in the PropertyManager. reorder Features If you rotate the part around to the backside by pressing and holding the scroll wheel while moving the mouse, you will notice that the last fillet you created is not continuous around the boss, as shown in Figure 3.73. The radius of the last fillet is slightly larger than the space between the boss and the edge of the part. There are two ways you could have avoided this issue; the first is using a smaller radius for the fillet. If the fillet was smaller, SolidWorks wouldn’t have needed to change the geometry of the fillet to move around the boss. The second way you could have avoided this issue was to create the fillet before you added the boss.
18. 136 C h a p t e r 3 • C r e a t i n g Yo u r F i r s t P a r t F i g u r e 3 . 7 3 Fillet affected by boss For this part, you are not interested in changing the radius of the fillet, so that leaves creating the fillet before you created the boss. So, this is when you break out the time machine and go back a few minutes and add the radius. Of course, by time machine, we are referring to the FeatureManager design tree.  Here’s how to use the FeatureManager design tree to change the order in which you added features to your part: You can use the FeatureManager 1. In the FeatureManager design tree, select the first fillet that was cre- design tree to ated, Fillet1, with mouse pointer and click and hold the left mouse change the order in which features are button, as shown in Figure 3.74. applied to a part. F i g u r e 3 . 7 4 Selecting the fillet to be reordered in the FeatureManager 2. While still holding the left mouse button, drag the fillet feature up in the FeatureManager design tree, as shown in Figure 3.75. Since the boss was created as Boss-Extrude2, the fillet needs to be placed above this feature. When dragging a feature in the FeatureManager, the feature will be placed after a selected feature. Since the fillet feature needs to be placed above Boss-Extrude2, when Cut-Extrude1 is high- lighted by the mouse pointer, release the left mouse button.
19. Add Fillets and Chamfers 137 F i g u r e 3 . 7 5 Moving fillet creation to precede another feature N O t e When reordering features in the FeatureManager, the mouse pointer provides you with a visual cue to show that the feature will be placed below the highlighted feature. 3. After moving Fillet1, do the same with the other two fillets, each fol- lowing the previous. In the FeatureManager they must be listed in numerical order; otherwise, they will fail since they are each depen- dent on the previous. edit Fillet Feature Despite how careful you may be when changing the order of features in the FeatureManager design tree, there will be times when reordering features will cause an error. As you might have noticed, reordering Fillet1, Fillet2, and Fillet3 caused Fillet4 to fail. Next to the Fillet4 feature in the FeatureManager, a red circle with an X is displayed. This is how SolidWorks displays that there is an error with the feature.
20. 138 C h a p t e r 3 • C r e a t i n g Yo u r F i r s t P a r t There are many reasons a feature might fail, and sometimes trying to fig- ure out the error can be a little frustrating. SolidWorks does provide you with information about the error to aid you in debugging the issue. If you hover the mouse pointer over the error in the FeatureManager design tree, a brief expla- nation of the error will be display. Hovering over Fillet4 will display the error shown in Figure 3.76, and it explains that some filleted items are no longer in the model. F i g u r e 3 . 7 6 Error tooltip in FeatureManager This was caused because Fillet4 could no longer find the original edge that was used to create the feature. Being able to fix errors in the FeatureManager design tree is an important skill when using SolidWorks, and this gives you a great opportunity to learn how easy it is to do. Here’s how to correct the error by moving the fillet features back in time: 1. In the FeatureManager design tree, select the Fillet4 feature by press- ing and releasing the left mouse button. 2. In the context toolbar, select Edit Feature (Figure 3.77). F i g u r e 3 . 7 7 Editing a feature with errors