{"id":361,"date":"2021-03-31T21:35:12","date_gmt":"2021-04-01T01:35:12","guid":{"rendered":"https:\/\/opentextbc.ca\/autocad3d\/chapter\/visualizing-multiview-drawings\/"},"modified":"2021-11-04T11:37:26","modified_gmt":"2021-11-04T15:37:26","slug":"visualizing-multiview-drawings","status":"publish","type":"chapter","link":"https:\/\/opentextbc.ca\/autocad3d\/chapter\/visualizing-multiview-drawings\/","title":{"raw":"Module 7: Visualizing Multiview Drawings","rendered":"Module 7: Visualizing Multiview Drawings"},"content":{"raw":"
\n

Learning Outcomes<\/p>\n\n<\/header>\n

\n\nWhen you have completed this module, you will be able to:\n
    \n \t
  1. Draw isometric drawings on an isometric grid using multiview drawings as a reference.<\/li>\n \t
  2. Construct 3D models in AutoCAD using multiview drawings.<\/li>\n<\/ol>\n<\/div>\n<\/div>\n

    Visualizing 3D Models<\/h1>\nIn the first six modules, all of the wireframe models that you constructed were referenced to a given 3D view of the model. Since most technical drawings used in the drafting and design world are 2D multiview drawings, 3D models must be able to be drawn using a multiview drawing as a reference to find the model's shape and dimensions. To construct a 3D model, you must be able to mentally visualize the 3D model using a multiview drawing as a reference.\n\nA good way for you to learn to visualize a 3D model from a 2D multiview drawing is to first draw the model as an isometric drawing. By doing this, it is easier to form a mental image from the multiview drawing. After practicing this for while, you will be able to visualize and construct 3D models without drawing the isometric first.\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"300\"]\"\" Figure 7-1
    An Isometric Drawing[\/caption]\n\nAn isometric drawing <\/em><\/span>is a 2-dimensional drawing that has the XYZ axis drawn at 120 degrees apart as shown in Figure 7-1. In this module, drawing the isometric on an isometric grid will be taught. An isometric grid has the grid lines drawn at 120 degrees as shown in Figure 7-2. Figure 7-3 shows a rectangular box drawn on the isometric grid.\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"320\"]\"\" Figure 7-2 An Isometric Grid[\/caption]\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"343\"]\"\" Figure 7-3
    A Rectangular Box Drawn on an Isometric Grid[\/caption]\n

    WORK ALONG: Visualizing 3D Models<\/h1>\n

    Step 1<\/h2>\nUsing the NEW command, start a new drawing using the template: 3D Layout English<\/span>.\n

    Step 2<\/h2>\nSave and name the drawing: AutoCAD 3D Workalong 07-1<\/span>.\n

    Step 3<\/h2>\nSet the UCS to World and the view to Top. Enter the UNITS command. In the Units dialogue box, set the Insertion Units to Inches. Using the INSERT command, insert the block: AutoCAD 3D Workalong 07-1<\/span> at the coordinates 0,0,0. Explode the block. The drawing should appear as shown in the figure. (Figure Step 3)\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"255\"]\"\" Figure Step 3[\/caption]\n\n
    \n\nAUTHOR'S COMMENTS: <\/strong>In this workalong, you will be using AutoCAD to draw isometric drawings of objects on atwo-dimensional isometric grid. This is only a teaching tool to help you visualize 3D models using the multiview drawing of the object. Isometric drawings were used extensively in the drafting field before CAD was used.\n\nWith AutoCAD, you can draw in true 3D and isometric drawing are not really required. They are, however, a good teaching tool for this module.\n\n<\/div>\n

    Step 4<\/h2>\nChange the layer of the isometric grid from layer: 0<\/span> to layer: Grid<\/span>.\n

    Step 5<\/h2>\nLock layer: Grid<\/span> and set the lineweight<\/span> of layer: Object<\/span> to 0.35 mm. (Figure Step 5)\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"600\"]\"\" Figure Step 5[\/caption]\n

    Step 6<\/h2>\nEnable OSNAP and LWT. (Figure Step 6)\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"478\"]\"\" Figure Step 6[\/caption]\n

    Step 7<\/h2>\nFigure Step 7A shows the multiview drawing of Object 7-1. Set layer: Object<\/span> as the current layer and draw a box 6 grids long, 5 grids wide and 4 grids high. Where it is drawn is not that important but it should be located somewhere in the top left corner. Ensure that all lines are snapped to the grid intersections. Since layer: Grid<\/span> is locked, the lines can be freely moved on layer: Object<\/span>, as required. (Figure Step 7A, 7B, and 7C)\n
    AUTHOR'S COMMENTS: <\/strong>One grid on the multiview drawing equals one grid on the isometric.<\/div>\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"294\"]\"\" Figure Step 7A
    Multiview Drawing - Object 7-1[\/caption]\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"292\"]\"\" Figure Step 7B[\/caption]\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"274\"]\"\" Figure Step 7C[\/caption]\n\n
    AUTHOR'S COMMENTS: <\/strong>Solve one view at a time. Pick the view with the hardest contour to start with. In this case, start with the Front view.<\/div>\n

    Step 8<\/h2>\nTo draw the contour of the Front view, count the number of grids for the diagonal cut off. It is 3 grids on the X axis and 2 grids on the Z axis. Using those dimensions, draw the inclined lines on the front and rear view and add the lines to connect them. (Figure Step 8)\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"291\"]\"\" Figure Step 8[\/caption]\n

    Step 9<\/h2>\nTrim and delete the lines to complete the contour of the front view. (Figure Step 9)\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"291\"]\"\" Figure Step 9[\/caption]\n

    Step 10<\/h2>\nAdd the lines to cut out the contour of the Right Side view. (Figure Step 10)\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"291\"]\"\" Figure Step 10[\/caption]\n

    Step 11<\/h2>\nTrim and delete the necessary lines to complete the Right Side view contour and then add the lines to form the Top view contour. (Figure Step 11)\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"291\"]\"\" Figure Step 11[\/caption]\n

    Step 12<\/h2>\nTrim and delete any unwanted lines to complete the isometric object: Object 7-1<\/span>. The drawing should appear similar to figure. (Figure Step 12A and 12B)\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"291\"]\"\" Figure Step 12A[\/caption]\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"297\"]\"\" Figure Step 12B[\/caption]\n

    Step 13<\/h2>\nUsing what was just taught, draw the isometric drawing of: Object 7-2<\/span>. Draw it in the top right corner of the grid. (Figure Step 13)\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"262\"]\"\" Figure Step 13[\/caption]\n\n
    AUTHOR'S COMMENTS: <\/strong>Solve one view at time. Pick the view with the hardest contour to start with. In this case, start with the Front view.<\/div>\n

    Step 14<\/h2>\nThe figures show the necessary steps. Try to complete the isometric without looking at the figure. (Figure Step 14A, 14B, 14C, and 14D)\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"267\"]\"\" Figure Step 14A[\/caption]\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"266\"]\"\" Figure Step 14B[\/caption]\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"267\"]\"\" Figure Step 14C[\/caption]\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"266\"]\"\" Figure Step 14D[\/caption]\n

    Step 15<\/h2>\nYour drawing should now appear similar to the figure. (Figure Step 15)\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"268\"]\"\" Figure Step 15[\/caption]\n

    Step 16<\/h2>\nUsing what was just taught, draw isometric drawings of the four objects: Object 7-3<\/span> to Object 7-6<\/span>. For the answers, see Figure \"Isometric drawing of Object 7-1 to Object 7-6\" at the end of this chapter. Try to visualize the 3D model by looking at the multiview drawing and then draw the isometric. Do not look at the answers until you have done your best to complete the isometric drawing of each object. (Figure Step 16)\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"600\"]\"\" Figure Step 16[\/caption]\n

    Step 17<\/h2>\nSave and close the drawing.\n

    Key Principles<\/h1>\n
    \n

    Key Principles in Module 7<\/p>\n\n<\/header>\n

    \n
      \n \t
    1. An isometric drawing is a 2-dimensional drawing that has the XYZ axis drawn 120 degrees<\/li>\n \t
    2. An isometric drawing is only used in the AutoCAD 3D book as a teaching They are mostly obsolete in the CAD design and drafting world.<\/li>\n<\/ol>\n<\/div>\n<\/div>\n

      Lab Exercise 7-1<\/h1>\nTime allowed: 40 minutes.\n\n\n\n\n
      Drawing Name<\/th>\nTemplate<\/th>\nUnits<\/th>\n<\/tr>\n
      AutoCAD 3D Lab 07-1<\/td>\n3D Layout English<\/td>\nInches<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      Step 1<\/h2>\nDraw all construction objects on layer: Construction<\/span> and all model objects on layer Model<\/span>. When complete, freeze layer: Construction<\/span>.\n

      Step 2<\/h2>\nDraw a wireframe model of the object. (Figure Step 2A, 2B, and 2C)\n
      AUTHOR'S COMMENTS:\u00a0<\/strong>Draw the Front view first.<\/div>\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"600\"]\"\" Figure Step 2A
      Dimensioned Multiview Drawing[\/caption]\n

      Step 3<\/h2>\nStart with the current view SE Isometric. If required, orbit it slightly with 3DFORBIT to help your line of sight.\n

      Step 4<\/h2>\nEnter the UNITS command. In the Units dialogue box, set the Insertion Units to Inches. Change the current UCS to World and check the model with the key.\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"296\"]\"\" Figure Step 2B
      Complete Wireframe Model[\/caption]\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"400\"]\"\" Figure Step 2C
      Solid Model - SE Isometric View[\/caption]\n\n[caption id=\"attachment_360\" align=\"aligncenter\" width=\"600\"]\"\" Isometric drawing of Object 7-1 to Object 7-6[\/caption]","rendered":"
      \n
      \n

      Learning Outcomes<\/p>\n<\/header>\n

      \n

      When you have completed this module, you will be able to:<\/p>\n

        \n
      1. Draw isometric drawings on an isometric grid using multiview drawings as a reference.<\/li>\n
      2. Construct 3D models in AutoCAD using multiview drawings.<\/li>\n<\/ol>\n<\/div>\n<\/div>\n

        Visualizing 3D Models<\/h1>\n

        In the first six modules, all of the wireframe models that you constructed were referenced to a given 3D view of the model. Since most technical drawings used in the drafting and design world are 2D multiview drawings, 3D models must be able to be drawn using a multiview drawing as a reference to find the model’s shape and dimensions. To construct a 3D model, you must be able to mentally visualize the 3D model using a multiview drawing as a reference.<\/p>\n

        A good way for you to learn to visualize a 3D model from a 2D multiview drawing is to first draw the model as an isometric drawing. By doing this, it is easier to form a mental image from the multiview drawing. After practicing this for while, you will be able to visualize and construct 3D models without drawing the isometric first.<\/p>\n

        \"\"
        Figure 7-1
        An Isometric Drawing<\/figcaption><\/figure>\n

        An isometric drawing <\/em><\/span>is a 2-dimensional drawing that has the XYZ axis drawn at 120 degrees apart as shown in Figure 7-1. In this module, drawing the isometric on an isometric grid will be taught. An isometric grid has the grid lines drawn at 120 degrees as shown in Figure 7-2. Figure 7-3 shows a rectangular box drawn on the isometric grid.<\/p>\n

        \"\"
        Figure 7-2 An Isometric Grid<\/figcaption><\/figure>\n
        \"\"
        Figure 7-3
        A Rectangular Box Drawn on an Isometric Grid<\/figcaption><\/figure>\n

        WORK ALONG: Visualizing 3D Models<\/h1>\n

        Step 1<\/h2>\n

        Using the NEW command, start a new drawing using the template: 3D Layout English<\/span>.<\/p>\n

        Step 2<\/h2>\n

        Save and name the drawing: AutoCAD 3D Workalong 07-1<\/span>.<\/p>\n

        Step 3<\/h2>\n

        Set the UCS to World and the view to Top. Enter the UNITS command. In the Units dialogue box, set the Insertion Units to Inches. Using the INSERT command, insert the block: AutoCAD 3D Workalong 07-1<\/span> at the coordinates 0,0,0. Explode the block. The drawing should appear as shown in the figure. (Figure Step 3)<\/p>\n

        \"\"
        Figure Step 3<\/figcaption><\/figure>\n
        \n

        AUTHOR’S COMMENTS: <\/strong>In this workalong, you will be using AutoCAD to draw isometric drawings of objects on atwo-dimensional isometric grid. This is only a teaching tool to help you visualize 3D models using the multiview drawing of the object. Isometric drawings were used extensively in the drafting field before CAD was used.<\/p>\n

        With AutoCAD, you can draw in true 3D and isometric drawing are not really required. They are, however, a good teaching tool for this module.<\/p>\n<\/div>\n

        Step 4<\/h2>\n

        Change the layer of the isometric grid from layer: 0<\/span> to layer: Grid<\/span>.<\/p>\n

        Step 5<\/h2>\n

        Lock layer: Grid<\/span> and set the lineweight<\/span> of layer: Object<\/span> to 0.35 mm. (Figure Step 5)<\/p>\n

        \"\"
        Figure Step 5<\/figcaption><\/figure>\n

        Step 6<\/h2>\n

        Enable OSNAP and LWT. (Figure Step 6)<\/p>\n

        \"\"
        Figure Step 6<\/figcaption><\/figure>\n

        Step 7<\/h2>\n

        Figure Step 7A shows the multiview drawing of Object 7-1. Set layer: Object<\/span> as the current layer and draw a box 6 grids long, 5 grids wide and 4 grids high. Where it is drawn is not that important but it should be located somewhere in the top left corner. Ensure that all lines are snapped to the grid intersections. Since layer: Grid<\/span> is locked, the lines can be freely moved on layer: Object<\/span>, as required. (Figure Step 7A, 7B, and 7C)<\/p>\n

        AUTHOR’S COMMENTS: <\/strong>One grid on the multiview drawing equals one grid on the isometric.<\/div>\n
        \"\"
        Figure Step 7A
        Multiview Drawing – Object 7-1<\/figcaption><\/figure>\n
        \"\"
        Figure Step 7B<\/figcaption><\/figure>\n
        \"\"
        Figure Step 7C<\/figcaption><\/figure>\n
        AUTHOR’S COMMENTS: <\/strong>Solve one view at a time. Pick the view with the hardest contour to start with. In this case, start with the Front view.<\/div>\n

        Step 8<\/h2>\n

        To draw the contour of the Front view, count the number of grids for the diagonal cut off. It is 3 grids on the X axis and 2 grids on the Z axis. Using those dimensions, draw the inclined lines on the front and rear view and add the lines to connect them. (Figure Step 8)<\/p>\n

        \"\"
        Figure Step 8<\/figcaption><\/figure>\n

        Step 9<\/h2>\n

        Trim and delete the lines to complete the contour of the front view. (Figure Step 9)<\/p>\n

        \"\"
        Figure Step 9<\/figcaption><\/figure>\n

        Step 10<\/h2>\n

        Add the lines to cut out the contour of the Right Side view. (Figure Step 10)<\/p>\n

        \"\"
        Figure Step 10<\/figcaption><\/figure>\n

        Step 11<\/h2>\n

        Trim and delete the necessary lines to complete the Right Side view contour and then add the lines to form the Top view contour. (Figure Step 11)<\/p>\n

        \"\"
        Figure Step 11<\/figcaption><\/figure>\n

        Step 12<\/h2>\n

        Trim and delete any unwanted lines to complete the isometric object: Object 7-1<\/span>. The drawing should appear similar to figure. (Figure Step 12A and 12B)<\/p>\n

        \"\"
        Figure Step 12A<\/figcaption><\/figure>\n
        \"\"
        Figure Step 12B<\/figcaption><\/figure>\n

        Step 13<\/h2>\n

        Using what was just taught, draw the isometric drawing of: Object 7-2<\/span>. Draw it in the top right corner of the grid. (Figure Step 13)<\/p>\n

        \"\"
        Figure Step 13<\/figcaption><\/figure>\n
        AUTHOR’S COMMENTS: <\/strong>Solve one view at time. Pick the view with the hardest contour to start with. In this case, start with the Front view.<\/div>\n

        Step 14<\/h2>\n

        The figures show the necessary steps. Try to complete the isometric without looking at the figure. (Figure Step 14A, 14B, 14C, and 14D)<\/p>\n

        \"\"
        Figure Step 14A<\/figcaption><\/figure>\n
        \"\"
        Figure Step 14B<\/figcaption><\/figure>\n
        \"\"
        Figure Step 14C<\/figcaption><\/figure>\n
        \"\"
        Figure Step 14D<\/figcaption><\/figure>\n

        Step 15<\/h2>\n

        Your drawing should now appear similar to the figure. (Figure Step 15)<\/p>\n

        \"\"
        Figure Step 15<\/figcaption><\/figure>\n

        Step 16<\/h2>\n

        Using what was just taught, draw isometric drawings of the four objects: Object 7-3<\/span> to Object 7-6<\/span>. For the answers, see Figure “Isometric drawing of Object 7-1 to Object 7-6” at the end of this chapter. Try to visualize the 3D model by looking at the multiview drawing and then draw the isometric. Do not look at the answers until you have done your best to complete the isometric drawing of each object. (Figure Step 16)<\/p>\n

        \"\"
        Figure Step 16<\/figcaption><\/figure>\n

        Step 17<\/h2>\n

        Save and close the drawing.<\/p>\n

        Key Principles<\/h1>\n
        \n
        \n

        Key Principles in Module 7<\/p>\n<\/header>\n

        \n
          \n
        1. An isometric drawing is a 2-dimensional drawing that has the XYZ axis drawn 120 degrees<\/li>\n
        2. An isometric drawing is only used in the AutoCAD 3D book as a teaching They are mostly obsolete in the CAD design and drafting world.<\/li>\n<\/ol>\n<\/div>\n<\/div>\n

          Lab Exercise 7-1<\/h1>\n

          Time allowed: 40 minutes.<\/p>\n\n\n\n\n
          Drawing Name<\/th>\nTemplate<\/th>\nUnits<\/th>\n<\/tr>\n
          AutoCAD 3D Lab 07-1<\/td>\n3D Layout English<\/td>\nInches<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          Step 1<\/h2>\n

          Draw all construction objects on layer: Construction<\/span> and all model objects on layer Model<\/span>. When complete, freeze layer: Construction<\/span>.<\/p>\n

          Step 2<\/h2>\n

          Draw a wireframe model of the object. (Figure Step 2A, 2B, and 2C)<\/p>\n

          AUTHOR’S COMMENTS:\u00a0<\/strong>Draw the Front view first.<\/div>\n
          \"\"
          Figure Step 2A
          Dimensioned Multiview Drawing<\/figcaption><\/figure>\n

          Step 3<\/h2>\n

          Start with the current view SE Isometric. If required, orbit it slightly with 3DFORBIT to help your line of sight.<\/p>\n

          Step 4<\/h2>\n

          Enter the UNITS command. In the Units dialogue box, set the Insertion Units to Inches. Change the current UCS to World and check the model with the key.<\/p>\n

          \"\"
          Figure Step 2B
          Complete Wireframe Model<\/figcaption><\/figure>\n
          \"\"
          Figure Step 2C
          Solid Model – SE Isometric View<\/figcaption><\/figure>\n
          \"\"
          Isometric drawing of Object 7-1 to Object 7-6<\/figcaption><\/figure>\n","protected":false},"author":90,"menu_order":1,"template":"","meta":{"pb_show_title":"on","pb_short_title":"","pb_subtitle":"","pb_authors":[],"pb_section_license":""},"chapter-type":[],"contributor":[],"license":[],"class_list":["post-361","chapter","type-chapter","status-publish","hentry"],"part":334,"_links":{"self":[{"href":"https:\/\/opentextbc.ca\/autocad3d\/wp-json\/pressbooks\/v2\/chapters\/361","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/opentextbc.ca\/autocad3d\/wp-json\/pressbooks\/v2\/chapters"}],"about":[{"href":"https:\/\/opentextbc.ca\/autocad3d\/wp-json\/wp\/v2\/types\/chapter"}],"author":[{"embeddable":true,"href":"https:\/\/opentextbc.ca\/autocad3d\/wp-json\/wp\/v2\/users\/90"}],"version-history":[{"count":1,"href":"https:\/\/opentextbc.ca\/autocad3d\/wp-json\/pressbooks\/v2\/chapters\/361\/revisions"}],"predecessor-version":[{"id":362,"href":"https:\/\/opentextbc.ca\/autocad3d\/wp-json\/pressbooks\/v2\/chapters\/361\/revisions\/362"}],"part":[{"href":"https:\/\/opentextbc.ca\/autocad3d\/wp-json\/pressbooks\/v2\/parts\/334"}],"metadata":[{"href":"https:\/\/opentextbc.ca\/autocad3d\/wp-json\/pressbooks\/v2\/chapters\/361\/metadata\/"}],"wp:attachment":[{"href":"https:\/\/opentextbc.ca\/autocad3d\/wp-json\/wp\/v2\/media?parent=361"}],"wp:term":[{"taxonomy":"chapter-type","embeddable":true,"href":"https:\/\/opentextbc.ca\/autocad3d\/wp-json\/pressbooks\/v2\/chapter-type?post=361"},{"taxonomy":"contributor","embeddable":true,"href":"https:\/\/opentextbc.ca\/autocad3d\/wp-json\/wp\/v2\/contributor?post=361"},{"taxonomy":"license","embeddable":true,"href":"https:\/\/opentextbc.ca\/autocad3d\/wp-json\/wp\/v2\/license?post=361"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}