Introduction to AutoCAD 2012

Transcription

1 Page 1 Introduction to AutoCAD 2012 Alf Yarwood Chapter 19 Exercise 1 1. Open AutoCAD 2012 with a double-click on its shortcut icon in the Windows desktop. 2. Open the template acadiso3d.dwt. 3. Change the colour in layer 0 to magenta. 4. In the ViewCube/Right view construct a pline to the shape of the end view of one of the end plates and extrude to a height of 19. Subtract the diameter 10 holes from the extrusion. 5. Construct two cylinders central to the plate, one of R40 and height 40 and the other of R50 and height 40, and subtract the smaller from the larger. 6. Make the layer Construction current and construct two cylinders, one of radius 40 and height 40, the other of radius 50 and height In the ViewCube/Front view move the cylinders to form the boss at the ends. Copy one cylinder to the end of the 250 long cylinder. Move the three cylinders bringing the spindle into position. Form a union of the two parts of the end. Form another union of the three parts of the roller. Copy the end to form the other end of the holders. 8. Place in the ViewCube/Isometric view. 9. Shade the model in the Realistic visual style. 10. In the ViewCube/Top view add lighting and attach materials to the parts of the model. 11. Place in the ViewCube/Isometric view and render. 12. Save to a memory stick with the file name 19_Exercise02.dwg. 13. Close the drawing window.

2 Page 2 Chapter 19 Exercise 2 1. Open AutoCAD 2012 with a double-click on its shortcut icon in the Windows desktop. 2. Open the template acadiso3d.dwt. 3. Make three new layers: Clamp (blue); Rod (red); Vblock (magenta). 4. Make layer Clamp current. 5. In the ViewCube/Top view construct two pline outlines for the body of the clamp. 6. Extrude the larger to a height of 4 and the smaller to a height of Move the smaller extrusion to lie in its correct place in the larger. 8. Form a union of the two extrusions. 9. Place in ViewCube/Isometric. 10. Change to the Realistic visual style. 11. In the ViewCube/Front view construct two plines, one for the cylinder and another for the screw thread from which solids of revolution can be constructed for the cylinder and its screw thread at the top of the clamp. 12. In the ViewCube/Isometric view, form a union between the cylinder and the clamp and subtract the screw thread from the union. Change to a Realistic visual style.

3 Page Still in the Clamp layer, construct a pline for a solid of revolution for the clamp screw and using the Revolve tool from the Home 3D Modeling panel form the screw. 14. Add the pin for the clamp screw. 15. Make layer Vblocks current and in the ViewCube/Front view construct a pline outline for one of the a blocks. Extrude to a height of Copy the vblock to form the second of a pair. 17. Copy the clamp to form the second clamp and move both clamps to suitable positions in relation to the vblocks in the ViewCube/ Top view. 18. Place in the ViewCube/Isometric view and in the Realistic visual style..

4 Page Add suitable lighting to the scene and attach suitable materials to the various parts of the model and render Save the model to the file name 19_Exercise02.dwg in a memory stick. 17. Close the drawing window. Chapter 19 Exercise 3 1. Open AutoCAD 2012 with a double-click on its shortcut icon in the Windows desktop. 2. Open the template acadiso3d.dwt. Note In this exercise instead of setting views by using the ViewCube, views will be set from the drop-down menu from the View/Views panel. As a start the Auto- CAD window is set in the Front view from this drop-down menu. 3. In the Front view construct a pline indicating the central line of the front view as shown in Fig In the Right view construct two circles of diameters 85 and 95 at the end of the central line.

5 Page 5 5. The illustration below shows the centre line and the circles in the Southwest Isometric view. 6. With the Extrude tool from the Home panel extrude the circles long the path of the central line. Subtract the smaller extrusion from the larger. 7. In the Top view construct two cylinders of diameters 85 and 95 and subtract the smaller from the larger. Form a union between this union and the first part of the model. Material accompanying Introduction to AutoCAD 2011, ISBN Copyright 2010, Alf Yarwood.

6 Page 6 8. In the Top view construct a pline outline of one of the flanges and extrude to a height of 10. Subtract the 15 diameter holes from the extrusion. 9. In the Top view copy the flange three times to their positions relative the model so far. 10. In the Top view, construct four cylinders of diameters 85 and 95, the first of height 10, the other three of height The first at the centre of the first flange, the others at the centres of the other three flanges. Form a union of the flanges, the larger cylinders and the main model. Then subtract the smaller cylinders from the model Place in the Southeast Isometric view. Add lighting, attach a suitable material and render. 12 Save the drawing to the file name 19_Exercise03.dwg in a memory stick.

7 Page 7 Chapter 19 Exercise 4 1. Open AutoCAD 2012 with a double-click on its shortcut icon in the Windows desktop. 2. Open the template acadiso3d.dwt. 3. Make five new layers - Layer1 (red), Layer2 (blue), Layer3 (magenta), Layer4 (green) and Layer5 (cyan). 4. Construct the body on Layer1, the cylinder on Layer2, the flange on Layer3, the pin on Layer4 and the bolts on Layer5 working on the Top, the Right and the Left views. A Realistic visual shading the model is shown above. 5. Shade in the 3D Hidden visual style. 6. Save the drawing to the file name 19_Exercise04.dwg in a memory stick. 7. Close the drawing window

8 Page 8 Chapter 19 Exercise 5 1. Open AutoCAD 2012 with a double-click on its shortcut icon in the Windows desktop. 2. Open the template acadiso3d.dwt. 3. Set ISOLINES to Make Layer1 current and in the UCS RIGHT construct the left-hand handle. 5. On Layer2 construct one of the hanging brackets partly in the Right view and partly in the Top view. 6. On Layer3 construct the spindle. 7. On Layer4 construct the right-hand pointer. 8. Realistic shade the model. 9. At the command line enter u (Undo) and the drawing reverts to its unshaded state. 10. In the UCS WORLD separate the parts and when separated place in the Southwest Isometric view. 11. Place in the UCS WORLD and add lighting. 12. Place in the Southwest Isometric view and add materials. 13. Render the model (see next page) 14. Save to the file name 19_Exercise06.dwg in a memory stick. 15. Close the drawing window.

9 Page 9 Chapter 19 Exercise 6 1. Open AutoCAD 2012 with a double-click on its shortcut icon in the Windows desktop. 2. Open the template acadiso3d.dwt. 3. Set ISOLINES to In the Front view construct plines for solids of revolution for all three parts of the model - the main body and the screwed hole in the main body on Layer1, the handle on Layer2 and the pin on Layer3. 5. Construct the solids of revolution with the Revolve tool.

10 Page Move the screwed hole solid into its position in relation to the main body. Check in the Right view that it is correctly placed and subtract it from the main body. Make the Layer3 current and construct the hexagonal extrusion for the head of the bolt. 7. While in the Right view construct a box for the keyway in the main body on Layer1. Check in the Front view that it is in the correct position and subtract from the main body. On Layer3 move the hexagonal extrusion for the bolt into place and subtract it from the bolt. 8. Shade in the Conceptual visual style. 9. Undo the shading and place the drawing in the UCS WORLD. Move the parts of the assembly to fit together. 10. While in the UCS WORLD add lighting. 11. Attach materials to the parts of the assembly. 12. Render the model. 13. Save the model with a file name 19_Exercise07.dwg in a memory stick 14. Close the drawing window.

11 Chapter 19 Exercise 7 1. Open AutoCAD 2012 with a double-click on its shortcut icon in the Windows desktop. 2. Open the template acadiso3d.dwt. 3. In the Front view left-click Insert from the menu bar and from the Insert drop-down menu click Raster Image Reference... From the Select Reference File dialog whic h appears, select the larger bitmap. 4. Press the F3 keyboard key to set Osnap on. Then using the Distance tool measure the height and width of the bitmap and make a note of the measurements so found - as follows: Command: enter di rigth-click DIST Specify first point: pick the top left-hand corner of the bitmap Specify second point or [Multiple points]: pick the bottom left-hand corner of the bitmap Distance = 88.3, Angle in XY Plane = 270, Angle from XY Plane = 0 Delta X = 0.0, Delta Y = 88.3, Delta Z = 0.0 Command: 5. Repeat to obtain the width of the bitmap. 6. In the Top view construct the pline outline as shown. Note that this outline is a section of the moulding for the picture frame and is in proportion to the sizes of the bitmap. Its sizes may vary according to the sizes of the bitmap. 7. Move the pline so fit against the b itmap and extrude it to a height of Note this allows for the depth of the rebate in the moulding. With the Mirror toolmirror the extrusion to obtain the other side of the frame 8. In the Right view construct the pline again and extrude it to a height of the width of the bitmap plus an allowancce for the rebate. Mirror the extrusion so as to obtain the other edhe of the frame. 9. In the South West Isometric view and with osnap set on, with the Move tool, move the four members of teh farme to their correct poisitions as regards the required frame. 10. With the Union tool form a union of th four members of the frame. Material accompanying Introduction to AutoCAD 2012, ISBN Copyright 2011, Alf Yarwood.

12 11. Place the frame with its bitmap in the Visual Styles/Shaded view. The result is as shown. 12. Follwing a similar routine construct a farem for the second bitmap, remembering that, because the picture irself is smaller a smaller section for the farmework will be necessary. The reslt is as shown. Additional exercises 1. Working to the details given in the two-view projection below construct the 3D solid model drawing as indicated in the illustration to the right. Add suitable lighting and materials and render your model. Material accompanying Introduction to AutoCAD 2012, ISBN Copyright 2011, Alf Yarwood.

13 Page An exploded orthographic projection is given below showing details of the rendered exploded assembly of part of a valve from a machine. Construct the 3D models needed for each of the parts of the assembly, add suitable materials and lighting and render your model. 3. The 3D solid model drawing shown has been constructed following the procedures outlined in the four views given below. Working to suitable dimensions construct each of the 3D models as shown in the drawings below and when Stage 4 has been completed add a column to support the assembled parts.when the 3D solid model has been completed attach a suitable material, add lighting and render your model. Material accompanying Introduction to AutoCAD 2012, ISBN Copyright 2011, Alf Yarwood.

14 Multiple choice questions 1. The Solprof tool is used for the following purpose: (a) To produce a profile for a 3D solid model drawing in a database (b) To produce an outline-only drawing from a 3D solid model drawing (c) To provide a profile similar to a front view from a 3D solid model drawing (d) To change a 3D solid model drawing from a Model Space drawing to a Paper Space drawing. 2. A polygonal viewport can be constructed in a Model Space viewport: (a) This is not true. A polygonal viewport can only be constructed in Paper Space viewports (b) Yes. A polygonal viewport can be constructed in either Model Space or Paper Space (c) Yes. A polygonal viewport can be constructed in Model Space by clicking the MODEL button when in paper Space (d) Yes providing there is only a single viewport on screen 3. A drawing can only be printed or plotted from a Paper Space drawing: (a) This is correct (b) Yes - providing the MODEL button has been clicked (c) Drawings can be printed or plotted from either Model Space or Paper Space (d) Drawings can only be printed from Paper Space, but plotted only from Model Space 4. A file name with the following extension shows that the file is a raster file: (a) *.dwg (b) *.dwt (c) *.bmp (d) *.dxf 5. When a photograph has been inserted in an AutoCAD drawing on screen and the drawing is printed or plotted, the photograph does not print or plot with the drawing: (a). This is correct (b). This is not true. The photograph will print or plot along with the drawing (c). This is true only if the photograph was inserted in a drawing in paper Space (d). This is true only if the photograph was inserted in a drawing in Model Space