SolidWorks 2011 Parts Bible - Matt Lombard [59]
13. Insert a second instance of this second block, and make sure that both of them have the center of the circle at the two remaining intersection points of the four-sided shape of the layout sketch. At this point, your sketch should look like Figure 3.46.
Figure 3.46
Block placement
14. Click the Belt/Chain tool on the Blocks toolbar. Select the blocks in counterclockwise order, starting at the Origin. On the last pulley, you will have to click the arrow to get the belt to go the correct way around the pulley. Use Figure 3.47 as a guide.
15. Make sure that the Engage Belt option is selected. This enables you to make the pulleys move in the same way that they would in a real belt-driven mechanism.
16. Click the Use Belt Thickness option and assign .25 inches for the thickness. The belt should be offset from the pulleys.
17. Click the green check mark icon.
18. Click and drag one of the corners of the square in a pulley. All the pulleys should turn as if this were a real mechanism. The ratios are also observed because the small pulleys rotate faster than the large ones.
19. Save this part as Blocks and Belts Tutorial.sldprt. Exit the part.
Figure 3.47
Creating the belt around the pulleys
Tutorial: Creating Reference Geometry
This tutorial steps you through creating reference geometry on an existing part in preparation for locating 3D features.
On the DVD
The Chapter 3 Reference Geometry.SLDPRT file (or drawing) used in this tutorial is in the Chapter 3 folder on the DVD.
1. Open the file from the DVD in the Chapter 3 folder called Chapter 3 Reference Geometry - start.sldprt.
2. In the FeatureManager filter, type plane1. Double-click Plane1 in the FeatureManager, then double-click the 3.25-inch dimension on the screen and change it to 3.35 inches. Click the rebuild symbol (traffic light) and watch the update. This plane locates the mounting base of the part.
When you are done, click the X at the right end of the FeatureManager filter to clear the result. Pressing Esc does the same thing.
3. Click the Axis toolbar button from the Reference Geometry flyout menu (on the Features tab of the CommandManager in a default install).
4. Select the inside face of a hole on the part, as shown in Figure 3.48. This creates an axis on the centerline of the hole. You should note that a temporary axis already exists for all cylindrical faces, but making a true axis feature helps this one stand out as different from the other holes on the part.
Figure 3.48
Making one hole stand out by creating an axis feature
The selection of the Cylindrical/Conical Face option should be automatically activated by your selection of the cylindrical face of the hole. Accept the result with the green check mark when the selections and settings are complete.
5. Click the Plane toolbar button from the Reference Geometry flyout on the Features tab of the CommandManager.
6. Select the large cylindrical face of the part as the First Reference and the axis you just created as the Second Reference. Make sure the First Reference uses the Tangent constraint and the Second Reference uses the Coincident constraint. This makes a plane tangent to the main cylinder in the part that goes through the patterned hole, as shown in Figure 3.49.
Figure 3.49
Creating a plane from tangent and coincident constraints
Click the green check mark to accept the result.
7. Open a new sketch on the new plane.
8. Click the View menu and activate the Temporary Axes option. You should now see blue axes (without names) appear along the centerlines of every conical or cylindrical face on the model (except for faces created by fillet or chamfer features).
Note
If the view is already normal to the selected plane, and you double-click Normal To, the view switches to 180 degrees opposite. For this exercise, it doesn't matter which way you view the part, but from the top is better than from the bottom because the view is clearer.
9.