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

Encode Denso QR Bar Code 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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48 Benefits of Solid Modeling
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Fig 48-5
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7 Using the ID command, pick a point at the bottom of the part
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The value of the z coordinate should be greater than 00000 If it is 00000 or a value less than 0, you must move the solid upward into the positive XYZ octant 8 If necessary, move the solid upward into the positive XYZ octant
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Creating the STL File
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Now that the pulley is properly positioned, you can create the STL le 1 Enter the UCS command and W for World 2 Enter the STLOUT command, pick the solid, and press ENTER AutoCAD wants to know whether you want to create a binary STL le Normally, you would create a binary le because binary les are much smaller than ASCII les However, you cannot view the contents of a binary STL le, and we want to view its contents
48: Bene ts of Solid Modeling
Wohlers: Applying AutoCAD 2010
IX Solid Modeling
48 Benefits of Solid Modeling
The McGraw Hill Companies, 2010
3 Enter No to create an ASCII STL le 4 Pick the Save button in the Create STL File dialog box or press ENTER to accept halfstl as the name of the le
Reviewing the STL File Data
Let s review the contents of the STL le 1 Minimize AutoCAD and start WordPad 2 Select Open from the File pull-down menu 3 In the File name box, enter *stl Be sure to press ENTER 4 Open the le named halfstl The contents of the le appear The text listing in Fig 48-6 shows the rst part of the le STL les consist mainly of groups of x, y, and z coordinates Each group of three de nes a triangle
solid AutoCAD facet normal 00000000e+000 00000000e+000 10000000e+000 outer loop vertex 84399540e+000 48596573e+000 10000000e 001 vertex 85000000e+000 42500000e+000 10000000e 001 vertex 58750000e+000 42500000e+000 10000000e 001 endloop endfacet facet normal 00000000e+000 00000000e+000 10000000e+000 outer loop vertex 48750000e+000 42500000e+000 10000000e 001 vertex 22500000e+000 42500000e+000 10000000e 001 vertex 23100460e+000 48596573e+000 10000000e 001 endloop endfacet facet normal 00000000e+000 00000000e+000 10000000e+000 outer loop vertex 49130602e+000 44613417e+000 10000000e 001 vertex 48750000e+000 42500000e+000 10000000e 001 vertex 23100460e+000 48596573e+000 10000000e 001 endloop endfacet facet normal 00000000e+000 00000000e+000 10000000e+000
Fig 48-6
Part 9: Solid Modeling
Wohlers: Applying AutoCAD 2010
IX Solid Modeling
48 Benefits of Solid Modeling
The McGraw Hill Companies, 2010
F i g 4 8 -7
5 After you have reviewed the le, close WordPad and maximize AutoCAD 6 Save your work and exit AutoCAD The view shown in Fig 48-7 was created using a special utility called stlviewlsp This utility reads and displays the contents of an ASCII STL le As you can see, an STL le is indeed made up of triangular facets You can adjust the size of the triangles using the FACETRES (short for facet resolution ) system variable by changing its value before you create the STL le A high value creates a more accurate part with a smoother surface nish, but the le size and the time required to process the le increase You should set it as high as necessary to produce an accurate part Knowing what this value should be for a given part comes with experience and experimentation
Part Creation
Hundreds of organizations around the world can create parts from STL les If you were to send the halfstl le to one of them, that organization could create a part for you, typically for a fee Autodesk (the maker of AutoCAD) has partnered with service providers to make 3D printing available The Send to 3D Print Service button in the Output tab opens a dialog box that allows you to order one or more parts Figure 48-8 on page 640 shows pictures of a completed plastic prototype part It was created from the halfstl le using a stereolithography additive manufacturing system
48: Bene ts of Solid Modeling
Wohlers: Applying AutoCAD 2010
IX Solid Modeling
48 Benefits of Solid Modeling
The McGraw Hill Companies, 2010
Notice the at segments that make up the large diameter of the pulley They are caused by the triangular facets You could reduce their size by increasing the value of FACETRES before creating the STL le You could also reduce their visibility by sanding the part, but this would change the accuracy of the part The part pictured in Fig 48-8 was built from a version of halfstl with FACETRES set at a relatively low value to show the undesirable effect of large facets
Fig 48-8 Prototype part courtesy of Laser Prototypes, Inc of Denville, New Jersey (Photos courtesy of Terry Wohlers)
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