code to generate barcode in c#.net Part 9: Solid Modeling in Software

Generation QR in Software Part 9: Solid Modeling

Part 9: Solid Modeling
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Wohlers: Applying AutoCAD 2010
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IX Solid Modeling
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43 Basic Modeling
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The McGraw Hill Companies, 2010
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Fig 43-19 Problem 4 courtesy of Gary J Hordemann, Gonzaga University
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43: Basic Modeling
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IX Solid Modeling
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44 Boolean Operations
The McGraw Hill Companies, 2010
Boolean Operations
Objectives
Prepare solid primitives for Boolean operations Use the Boolean subtraction operation to remove portions of a solid model Use the Boolean union operation to combine composite models
Vocabulary
Boolean logic Boolean mathematics Boolean operations composite solids
Much of AutoCAD solid modeling is based on the principles of Boolean
mathematics Boolean math, also called Boolean logic, is a system created by mathematician George Boole for use with logic formulas and operations AutoCAD Boolean operations, such as union, subtraction, and intersection, are used to create composite solids Composite solids are composed of two or more solid objects Using Boolean operations, let s create a composite solid of the steel support shown in Fig 44-1
Fig 44-1
Part 9: Solid Modeling
Wohlers: Applying AutoCAD 2010
IX Solid Modeling
44 Boolean Operations
The McGraw Hill Companies, 2010
Preparing the Base Solid
The rst step in creating a composite solid is to create the base solid the solid to which other solids will be joined 1 Start AutoCAD and begin a new drawing using the soliddwt template le 2 Using the PLINE Arc and Line options, create the shape shown in Fig 44-2 using the information below Use snap and grid settings of 25 to produce the polyline accurately Pick the four points in the order shown Each point falls on the snap grid In the PLINE command, use the Arc s Radius option You have just completed one quarter of the object shown in Fig 44-3 3 Mirror the shape to create one half of the object, and mirror that to create the entire object
Fig 44-2
4 Use the PEDIT Join option to join the four polylines into one
F i g 4 4 -3
44: Boolean Operations
Wohlers: Applying AutoCAD 2010
IX Solid Modeling
44 Boolean Operations
The McGraw Hill Companies, 2010
AU: Is SW correct here
Fig 44-4
5 Select the SW Isometric viewpoint 6 Save your work in a le named compositedwg
MODELING
7 Pick the Extrude button on the Modeling panel 8 Select the polyline and press ENTER 9 Specify a taper angle of 3 degrees, and enter 5 for the height A view similar to the one in Fig 44-4 appears 10 Pick the Top viewpoint, switch to the 3D Hidden visual style, and ZOOM All The top view allows you to see the taper, as shown in Fig 44-5, but without the two holes and the dimensions
Fig 44-5
Part 9: Solid Modeling
Wohlers: Applying AutoCAD 2010
IX Solid Modeling
44 Boolean Operations
The McGraw Hill Companies, 2010
11 Display the Coordinates panel and pick the World button (You can also select WCS at the yout menu below the ViewCube) 12 On the status bar, toggle Dynamic UCS off 13 Pick the Cylinder button on the Modeling panel and place two cylinders as shown in Fig 44-5 to represent the holes Make their radius 375 and their height 5
COORDINATES
Create one cylinder and use the COPY or MIRROR command to create the second You have just created two solid cylinders within the original extruded solid 14 Select the SE Isometric viewpoint and the Conceptual display
AU: Is SE correct here
Subtracting the Holes
The SUBTRACT command performs a Boolean operation that creates a composite solid by subtracting one solid object from another 1 Pick the Subtract button from the Solid Editing panel to enter the SUBTRACT command 2 Select the extruded solid (but not the cylinders) as the solid to subtract from, and press ENTER 3 Select the two cylinders as the solids to subtract, and press ENTER AutoCAD subtracts the volume of the cylinders from the volume of the extruded solid 4 Rotate the model to see that the cylinders have been removed, creating two holes in the solid The composite solid should look similar to the one in Fig 44-6
Fig 44-6 SOLID EDITING
44: Boolean Operations
Wohlers: Applying AutoCAD 2010
IX Solid Modeling
44 Boolean Operations
The McGraw Hill Companies, 2010
Adding the Support Cylinder
The UNION command permits you to join two solid objects to form a new composite solid 1 Select the Top view and the World UCS 2 Place a solid cylinder at the center of the model Make the diameter 175 , and make it 175 in height
Use the snap grid to snap to the center of the model
3 Using the same center point, place a second cylinder inside the rst Specify a diameter of 15 and a height of 175 4 Select the SE Isometric viewpoint
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