3D AutoCAD 2010 for Starters and Others. . .
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3D AutoCAD 2010 for Starters and Others. . .
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Saturday January 02, 2010
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Wireframe Table Create a wire frame model for a 48 x 23 coffee table constructed as shown below. Create the coffee table top and cross members made from 2 x 8s drawn at 1.5 x 7 actual dimensions and four legs from 4 x 4 drawn at 31/2 x 31/2 actual dimensions.
Figure 1 Completed wireframe table model in 2D Wireframe visual style display. To draw the wire frame table, apply the following procedure: 1. Open up the 3D Starter drawing and name it Wireframe Table to save the drawing.
2. Select Views → 3DViews → Top and then select Views → Visual Styles → 2D Wireframe and use the Zoom All option and turn the GRID to OFF. Add three additional layers named TOP, CROSS and LEG.
3. Change the units to architectural and limits to suit the object dimensions.
4. Select the TOP layer and create the table top using the ARRAY or COPY command to offset the three boards as shown below with a space of 1 between the 48" long top boards.
5. Turn to SE Isometric view and zoom-in as necessary.
Figure 2 Table top boards 48" in length spaced 1" using the ARRAY command in TOP view. 6. Copy the table top 1.5 inches up from the current work plane to give it the table top thickness. Zoom into the area of the lower left corner and connect the corner of the two planes of the first 2 x 8 with two vertical lines to form the boards shape at the end. Connect the lower right corner of the same board the same way.
Figure 3 In SE Isometric view use ZOOM to place one vertical line for the top board thickness on the first corner of the first board and then use the COPY or ARRAY command to place the other vertical lines. 7. Use the ARRAY command to close all the board ends in the same manner. This can be done in one step. Select all four vertical lines of the corners of the first board and then offset them by 8 using 3 rows and one column. Notice that the bottom of the table top is on the original x-y work plane.
Figure 4 Completed wireframes of the table top. 8. Select CROSS as your layer. 9. Add two cross members of the same board to the table as shown below. Place them 6 from each end of the table. Hint: Draw ones side each of the cross member and then use ARRAY with the proper row and column distances. You can also draw the cross member using FRONT view. It will then be drawn on the original x-y work plane.
Figure 5 Completed wireframe table top with the support cross members below. 10. Select LEG as your layer. 11. Add four legs two cross members 3 ½ square of the same board to the table as shown below. Place them on center with the top and cross board. Hint: Use the TOP view to draw the 4-sided polygon and the ARRAY to place them. The polygons can then be drawn on the original x-y work plane.
Figure 6 Wireframe table TOP view with legs showing through the table top and cross members. 12. Return to the SE Isometric view and turn layers TOP and CROSS off. 13. Copy the four squares vertically down 16 and connect the four corners of one of the legs with vertical lines to form the leg shape. Use the ARRAY command to form all the other legs in one step. 14. Return to the SE Isometric view and turn layers TOP and CROSS off. The wireframe table should look like the one shown in Figure 1. 15. Select View and then choose FRONT for a front view of the table as shown below:
Figure 7 Wireframe table FRONT view. 16. Save the drawing as Table Wireframe. Wire-frame models have no volume or mass and the HIDE command cannot be used. Since there are no surfaces you cant shade them. Example Surface Table Convert the Table Wireframe model into a surface model using the 3DFACE surfaces command and name the drawing Table Surface. Remember, surface models are better to visualize, as they imitate solid models and can be rendered for presentation with color, textures, lights and shadows.To complete this exercise, follow the general step as outlined below. 1. Open up the Wireframe Table drawing and save it as Table Surface. Make the layer SURFACE the current layer.
2. Select SE Isometrics view if not already selected. Turn layers LEG and CROSS off. This will display the table top section only to work on.
3. Invoke the 3DFACE command. Make certain you are on the TOP layer. Draw the bottom surface, one end and one side of the first board by picking 4 corners on each of the three surfaces.
Use Enter after the fourth point and the shape will close automatically to create the face. Select a face and right-click and select Properties. It should show 3DFACE on the Top layer. Finish adding surfaces to the entire table top following the hints shown below.
Hint: Pick one top, one end and one side surface of the first board one at the time and then use the ARRAY or COPY command three times to finish all other areas.
Select HIDE at different intervals and review the effects of placing surfaces on to the wireframe. Use ORBIT to check all sides and below the table top to make certain all sides have been surfaced.
4. REGEN the drawing and turn off the TOP and the LEG layer. This should show only the cross members.
5. Draw the necessary cross members surfaces and copy them to other areas using the same technique used for the table top.
When using the HIDE command, AutoCAD will not show you all of the cross member elements even so the TOP layer is turned off. The top of the table covers the view whether or not the top is hidden or not. One way to see that the cross members are in fact covered by surfaces using the HIDE command is to move the top elements to the side temporarily as shown in the sketch below.
Figure 8 Wireframe table top and cross members displayed at different locations for detail work.
6. Draw one surface of the table legs and add a top and bottom to each table leg. REGEN the drawing and turn off the TOP and the CROSS layer to display the table legs only.
7. Select the table leg surface and then apply it to the other table legs either using the ARRAY or COPY command.
Save the drawing as Table Surface.
Figure 9 Surfaces table looks like a solid model when surfaces are properly added and model is shaded. Surface models have no volume or mass but they hide background elements and surfaces can be shaded.
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