{"id":195,"date":"2021-03-24T21:23:24","date_gmt":"2021-03-25T01:23:24","guid":{"rendered":"https:\/\/opentextbc.ca\/autocad3d\/chapter\/world-coordinate-system\/"},"modified":"2021-11-04T11:36:55","modified_gmt":"2021-11-04T15:36:55","slug":"world-coordinate-system","status":"publish","type":"chapter","link":"https:\/\/opentextbc.ca\/autocad3d\/chapter\/world-coordinate-system\/","title":{"raw":"Module 3: World Coordinate System","rendered":"Module 3: World Coordinate System"},"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. Describe the World Coordinate System, the UCS icon, and the right-hand rule.<\/li>\n \t
  2. Draw 3D models with the UCS located at the World Coordinate System.<\/li>\n<\/ol>\n<\/div>\n<\/div>\n

    The World Coordinate System<\/h1>\nAutoCAD has two distinct three-dimensional coordinate systems: the World Coordinate System (WCS) and the User Coordinate System (UCS). The World Coordinate System <\/em><\/span>is permanently located at the absolute coordinates X0Y0Z0. It is a fixed coordinate system which can never be moved. The WCS is normally not used to construct models. You will be using it in this module to construct models as learning tool only.\n\nThe User Coordinate System<\/span> <\/em>(UCS) is the coordinate system that is used to construct 3D models. The UCS can be placed exactly at the WCS or at any location in 3D space. In this module, model will be constructed with the UCS located at the WCS. It is essential to be able to locate and orientate the UCS to construct most models. This is taught in Module 4 and 5.\n

    The UCS Icon<\/h2>\nFigure 3-1 shows the UCS icon and the positive X, Y and Z directions indicated by the UCS icon. When constructing models, it is very important to know which direction is positive and negative on all three axis.\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"286\"]\"\" Figure 3-1
    UCS Icon Coordinate Directions[\/caption]\n\nWhen the UCS is located at the World Coordinate System, it will display a small square at the origin as can be seen in Figure 3-2. If it is located at any other location, it will display as shown in Figure 3-3.\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"89\"]\"\" Figure 3-2 UCS at the World
    Coordinate System[\/caption]\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"81\"]\"\" Figure 3-3 UCS Not at the World Coordinate System[\/caption]\n

    The Right-Hand Rule<\/h2>\nEven though the 3D UCS icon indicates the positive Z direction, it is important to know how it is obtained. AutoCAD uses the right-hand rule<\/span> <\/em>to find the positive Z direction. See Figure 3-4. To use the right-hand rule, you must first know the positive X and Y directions of the current UCS.\n\nUsing your right hand, point your thumb in the direction of the positive X axis. Extend your index finger in the direction of the positive Y axis. The middle finger indicates the direction of the positive Z axis. By rotating your hand, the X, Y and Z axes will rotate to change the UCS location and orientation. It is important to be able to visualize how and where to move the UCS as you construct more complicated models.\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"254\"]\"\" Figure 3-4
    The Right-hand Rule[\/caption]\n\n
    \n

    Drawing with theZ Coordinate<\/h2>\n<\/div>\nWhile drawing in 2D, you only had to worry about entering the X and Y coordinates. Since the Z coordinate was omitted, AutoCAD used the default value of zero. When drawing in 3D, you must add the Z value in some coordinate input. For example, to enter the coordinates X2Y3Z4, enter 2,3,4 if it is an absolute coordinate and @2,3,4 if it is a relative coordinate.\n

    Absolute X0Y0Z0<\/h2>\nThe absolute coordinate 0,0,0 is the origin of the World Coordinate System. This is the same location used in 2D when only 0,0 was entered. This is an important coordinate location as everything drawn in model space relates back to this location. Keep this in mind when drawing all future models. It is especially important when constructing models that relate to real world locations. For example, when drawing a map, X0Y0Z0 is located at the equator and your model must be drawn in relation to that location.\n
    USER TIP:<\/strong> Similar to working in 2D, it is important to save the objects drawn for construction purposes. In all lab exercises, daw all construction objects on layer Construction and do not delete them when the model is complete. After completing the model, freeze layer Construction. When required, simply thaw layer Construction to display the construction objects.<\/div>\n

    WORK ALONG: Drawing 3D Wireframe Models with the UCS Located at the WCS<\/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 the drawing with the name: AutoCAD 3D Workalong 03-1<\/span>. (Figure Step 2)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"500\"]\"\" Figure Step 2
    Dimensioned Solid Model[\/caption]\n\n
    AUTHOR'S COMMENTS:<\/strong> Constructing models with the UCS located at the WCS is not the best method of constructing models. As a learning tool for this module, it simplifies model construction. This will help you when you draw your first few models.<\/div>\n

    Step 3<\/h2>\nSet the current view to SE Isometric. (Figure Step 3)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"89\"]\"\" Figure Step 3[\/caption]\n

    Step 4<\/h2>\nEnsure that the UCS Icon is enabled (On) and the Origin is enabled as shown in Module 1 WORKALONG: Using the UCSICON, VIEW, and 3DFORBIT Commands.\n

    Step 5<\/h2>\nSet layer: Model<\/span> as the current layer. Enter the LINE command, as shown below, to draw the lines to start the construction of the model. (Figure Step 5)\n\nCommand: LINE<\/strong>\n\nSpecify first point: 0,0,0<\/strong>\n\nSpecify next point or [Undo]: @2,0<\/strong>\n\n(Since you are working at Z zero, you can omit the Z value.)<\/em><\/span>\n\nSpecify next point or [Undo]: @2,2 <\/strong>\n\nSpecify next point or [Close\/Undo]: @4,0 <\/strong>\n\nSpecify next point or [Close\/Undo]: @0,2 <\/strong>\n\nSpecify next point or [Close\/Undo]: @-8,0 <\/strong>\n\nSpecify next point or [Close\/Undo]: C <\/strong>\n\nCommand:\n\n(Draw the object that is located on the XY axis as you did in 2D.)<\/em><\/span>\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"371\"]\"\" Figure Step 5[\/caption]\n

    Step 6<\/h2>\nUsing the OFFSET command, offset the two lines 1.5 units as shown in the figure. Change the layer properties of the two lines to layer: Construction. (Figure Step 6)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"440\"]\"\" Figure Step 6[\/caption]\n

    Step 7<\/h2>\nUse the CIRCLE command to draw a 2 diameter circle with its centre located at the intersection of the two construction lines. (Figure Step 7)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"401\"]\"\" Figure Step 7[\/caption]\n

    Step 8<\/h2>\nFreeze layer: Construction<\/span>. Enter the COPY command, as shown below, and copy the three lines and the circle 4 units in the positive Z direction. (Figure Step 8).\n\nCommand: COPY<\/strong>\n\nSelect objects:<\/span>\n\n(Select the three lines and the circle as shown in Figure Step 8.)<\/em><\/span>\n\nSelect objects:\n\nSpecify base point or displacement, or [Multiple]: 0,0,0<\/strong>\n\nSpecify second point of displacement or <use first point as displacement>: @0,0,4<\/strong>\n\n(Copy the 4 objects 4 units in the positive Z direction. Looking at the UCS or using the right- hand rule will indicated if it is a positive or negative direction.)<\/span><\/em>\n\nCommand:\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"386\"]\"\" Figure Step 8[\/caption]\n

    Step 9<\/h2>\nUsing the 3DFORBIT command, orbit the model slightly. (Figure Step 9)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"534\"]\"\" Figure Step 9[\/caption]\n

    Step 10<\/h2>\nUsing the COPY command, copy the 2 lines 2 units in the positive Z directions. (Figure Step 10)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"323\"]\"\" Figure Step 10[\/caption]\n

    Step 11<\/h2>\nUse the LINE command to draw six lines between the ends of the existing lines. Ensure that you snap to the ends of the lines. (Figure Step 11)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"350\"]\"\" Figure Step 11[\/caption]\n

    Step 12<\/h2>\nUsing the COPY command, copy the short line located at the right end of the model two times. Ensure that you use snap mode to locate the lines exactly. (Figure Step 12)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"350\"]\"\" Figure Step 12[\/caption]\n

    Step 13<\/h2>\nDraw three lines between the ends of the existing lines. Ensure to snap to the ends of the existing lines. (Figure Step 13)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"350\"]\"\" Figure Step 13[\/caption]\n

    Step 14<\/h2>\nUsing the VIEW command, save the current view with the name: Working Isometric. (Figure Step 14)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"607\"]\"\" Figure Step 14[\/caption]\n

    Step 15<\/h2>\nChange the current view to SE Isometric. (Figure Step 15)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"350\"]\"\" Figure Step 15[\/caption]\n

    Step 16<\/h2>\nEnter the UNITS command. In the Units dialogue box, set the Insertion Units to Inches. Insert the key: AutoCAD 3D Workalong 03-1<\/span>. It will overlay the model with a magenta model. (Figure Step 16)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"350\"]\"\" Figure Step 16[\/caption]\n\n
    AUTHOR'S COMMENTS:<\/strong> If you require help doing this, redo Module 2.<\/div>\n

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

    WORK ALONG: Drawing 3D Wireframe Models With the UCS Located at the WCS<\/h1>\n

    \u00a0Step 1<\/h2>\nUsing the NEW command, start a new drawing using the template: 3D Layout Metric.\n

    Step 2<\/h2>\nSave the drawing with the name: AutoCAD 3D Workalong 03-2<\/span>. (Figure Step 2)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"500\"]\"\" Figure Step 2
    Dimensioned Solid Model[\/caption]\n\n
    MUST KNOW:<\/strong> AutoCAD has two distinct three-dimensional coordinate systems: the World Coordinate System (WCS) and the User Coordinate System (UCS). The World Coordinate System is located at the absolute coordinates X0Y0Z0. It is a fixed coordinate system and cannot be moved. The WCS is normally not used to construct models. The UCS the coordinate system that is used to construct 3D models. The UCS can be placed exactly at the WCS or at any location in 3D space.<\/div>\n

    Step 3<\/h2>\nSet the current view to SE Isometric. (Figure Step 3)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"89\"]\"\" Figure Step 3[\/caption]\n

    Step 4<\/h2>\nEnsure that the UCS Icon is enabled (On) and the Origin is enabled as shown in Module 1, WORKALONG: Using the UCSICON, VIEW, and 3DFORBIT Commands.\n

    Step 5<\/h2>\nSet layer: Model<\/span> as the current layer. Draw the shape of the top of the object. Use the ARRAY command to speed up the construction. (Figure Step 5)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"322\"]\"\" Figure Step 5[\/caption]\n

    Step 6<\/h2>\nUsing the COPY command, as shown below, copy all of the objects 10 units in the negative Z direction. (Figure Step 6)\n\nCommand: COPY<\/strong>\n\nSelect objects:\n\n(Select all objects.)<\/em><\/span>\n\nSelect objects:\n\nSpecify base point or displacement, or [Multiple]: 0,0,0<\/strong>\n\nSpecify second point of displacement or <use first point as displacement>: @0,0,-10<\/strong>\n\nCommand:\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"322\"]\"\" Figure Step 6[\/caption]\n

    Step 7<\/h2>\nUsing the 3DFORBIT command, orbit the model slightly until it appears similar to the figure. (Figure Step 7)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"500\"]\"\" Figure Step 7[\/caption]\n

    Step 8<\/h2>\nDraw the vertical lines by snapping to the endpoints to complete the wireframe model. (Figure Step 8)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"313\"]\"\" Figure Step 8[\/caption]\n

    Step 9<\/h2>\nUsing the VIEW command, save the current view with the name: Working Isometric<\/span>. (Figure Step 9)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"201\"]\"\" Figure Step 9[\/caption]\n

    Step 10<\/h2>\nChange the view to SE Isometric. (Figure Step 10)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"320\"]\"\" Figure Step 10[\/caption]\n

    Step 11<\/h2>\nEnter the UNITS command. In the Units dialogue box, set the Insertion Units to Millimeters. Insert the key:\n\nAutoCAD 3D Workalong 03-2<\/span>. It will overlay the model with a magenta model. (Figure Step 11)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"334\"]\"\" Figure Step 11[\/caption]\n

    Step 12<\/h2>\nSave and close the drawing.\n

    Key Principles<\/h1>\n
    \n

    Key Principles in Module 3<\/p>\n\n<\/header>\n

    \n
      \n \t
    1. AutoCAD has two distinct three dimensional coordinate systems: the World Coordinate System (WCS) and the User Coordinate System (UCS).<\/li>\n \t
    2. The World Coordinate System is permanently located at the absolute coordinates It is a fixed coordinate system which can never be moved. The WCS is normally not used to construct models.<\/li>\n \t
    3. The User Coordinate System is the coordinate system that is normally used to construct 3D The UCS can be placed exactly at the WCS or at any location in 3D space.<\/li>\n \t
    4. AutoCAD uses the right-hand rule to find the positive Z To use the right-hand rule, you must first know the positive X and Y directions of the current UCS. Using your right hand, point the thumb in the direction of the positive X axis. Extend your index finger in the direction of the positive Y axis. Your middle finger indicates the direction of the positive Z axis.<\/li>\n \t
    5. The absolute coordinate 0,0,0 is the origin of the world coordinate This is the same point used when drawing in 2D when 0,0 was entered. This is an important coordinate location as everything drawn in model space relates back to this location.<\/li>\n<\/ol>\n<\/div>\n<\/div>\n

      Lab Exercise 3-1<\/h1>\nTime allowed: 45 minutes.\n\n\n\n\n
      Drawing Name<\/th>\nTemplate<\/th>\nUnits<\/th>\n<\/tr>\n
      AutoCAD 3D Lab 03-1<\/td>\n3D Layout English<\/td>\nInches<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      Step 1<\/h2>\nSave and name the drawing: AutoCAD 3D Lab 03-1<\/span>.\n

      Step 2<\/h2>\nDraw all construction objects on layer: Construction and model objects on layer: Model<\/span>.\n

      Step 3<\/h2>\nDraw a wireframe model of the object shown in the figure. (Figure Step 3A and 3B)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"500\"]\"\" Figure Step 3A
      Dimensioned Solid Model[\/caption]\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"185\"]\"\" Figure Step 3B Completed Wireframe Model SE Isometric View[\/caption]\n

      Step 4<\/h2>\nStart your model with the current view SE Isometric. If required, orbit it slightly with 3DFORBIT to help the line of sight.\n

      Step 5<\/h2>\nSave the isometric working view with the name: Working Isometric<\/span>.\n

      Step 6<\/h2>\nWhen complete, freeze layer: Construction.\n

      Step 7<\/h2>\nEnter the UNITS command. In the Units dialogue box, set the Insertion Units to Inches.\n

      Step 8<\/h2>\nCheck your drawing with the key. The key name is the same as the drawing name.\n
      CONSTRUCTION TECHNIQUES:<\/strong> The following steps are the construction technique suggested by the author to help you learn how to construct objects using AutoCAD. It is only the suggested method and if you can complete the drawing accurately using a different construction technique, that is what is important. You may want to compare your construction technique with the authors.<\/div>\n

      Hint 1<\/h2>\n\"\"\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"456\"]\"\" Figure Hint 1
      Construction Steps[\/caption]\n

      Lab Exercise 3-2<\/h1>\nTime allowed: 45 minutes.\n\n\n\n\n
      Drawing Name<\/th>\nTemplate<\/th>\nUnits<\/th>\n<\/tr>\n
      AutoCAD 3D Lab 03-2<\/td>\n3D Layout English<\/td>\nMillimeters<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      Step 1<\/h2>\nSave the drawing with the name: AutoCAD 3D Lab 03-2<\/span>.\n

      Step 2<\/h2>\nDraw all construction objects on layer: Construction<\/span> and all model objects on layer: Model<\/span>.\n

      Step 3<\/h2>\nDraw a wireframe model of the object shown in the figure. (Figure Step 3A, 3B, 3C, and 3D)\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"500\"]\"\" Figure Step 3A
      Dimensioned Solid Model[\/caption]\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"272\"]\"\" Figure Step 3B Completed Wireframe Model SE Isometric View[\/caption]\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"251\"]\"\" Figure Step 3C Key Detail[\/caption]\n\n[caption id=\"attachment_191\" align=\"aligncenter\" width=\"500\"]\"\" Figure Step 3D View of Keyway - Orbited[\/caption]\n

      Step 4<\/h2>\nStart your model with the current view SE Isometric. If required, orbit it slightly with 3DFORBIT to help the line of sight.\n

      Step 5<\/h2>\nSave the isometric working view with the name: Working Isometric<\/span>.\n

      Step 6<\/h2>\nWhen complete, freeze layer: Construction<\/span>.\n

      Step 7<\/h2>\nEnter the UNITS command. In the Units dialogue box, set the Insertion Units to Millimeters.\n

      Step 8<\/h2>\nCheck your drawing with the key. The key name is the same as the drawing name.\n
      CONSTRUCTION TECHNIQUES: <\/strong>The following steps are the construction technique suggested by the author to help you learn how to construct objects using AutoCAD. It is only the suggested method and if you can complete the drawing accurately using a different construction technique, that is what is important. You may want to compare your construction technique with the authors.<\/div>\n

      Hint 1<\/h2>\n
      \"\"<\/div>\n
      \"\"<\/div>\n
      \n\n[caption id=\"attachment_194\" align=\"aligncenter\" width=\"310\"]\"\" Figure Hint 1 Construction Steps[\/caption]\n\n<\/div>","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. Describe the World Coordinate System, the UCS icon, and the right-hand rule.<\/li>\n
      2. Draw 3D models with the UCS located at the World Coordinate System.<\/li>\n<\/ol>\n<\/div>\n<\/div>\n

        The World Coordinate System<\/h1>\n

        AutoCAD has two distinct three-dimensional coordinate systems: the World Coordinate System (WCS) and the User Coordinate System (UCS). The World Coordinate System <\/em><\/span>is permanently located at the absolute coordinates X0Y0Z0. It is a fixed coordinate system which can never be moved. The WCS is normally not used to construct models. You will be using it in this module to construct models as learning tool only.<\/p>\n

        The User Coordinate System<\/span> <\/em>(UCS) is the coordinate system that is used to construct 3D models. The UCS can be placed exactly at the WCS or at any location in 3D space. In this module, model will be constructed with the UCS located at the WCS. It is essential to be able to locate and orientate the UCS to construct most models. This is taught in Module 4 and 5.<\/p>\n

        The UCS Icon<\/h2>\n

        Figure 3-1 shows the UCS icon and the positive X, Y and Z directions indicated by the UCS icon. When constructing models, it is very important to know which direction is positive and negative on all three axis.<\/p>\n

        \"\"
        Figure 3-1
        UCS Icon Coordinate Directions<\/figcaption><\/figure>\n

        When the UCS is located at the World Coordinate System, it will display a small square at the origin as can be seen in Figure 3-2. If it is located at any other location, it will display as shown in Figure 3-3.<\/p>\n

        \"\"
        Figure 3-2 UCS at the World
        Coordinate System<\/figcaption><\/figure>\n
        \"\"
        Figure 3-3 UCS Not at the World Coordinate System<\/figcaption><\/figure>\n

        The Right-Hand Rule<\/h2>\n

        Even though the 3D UCS icon indicates the positive Z direction, it is important to know how it is obtained. AutoCAD uses the right-hand rule<\/span> <\/em>to find the positive Z direction. See Figure 3-4. To use the right-hand rule, you must first know the positive X and Y directions of the current UCS.<\/p>\n

        Using your right hand, point your thumb in the direction of the positive X axis. Extend your index finger in the direction of the positive Y axis. The middle finger indicates the direction of the positive Z axis. By rotating your hand, the X, Y and Z axes will rotate to change the UCS location and orientation. It is important to be able to visualize how and where to move the UCS as you construct more complicated models.<\/p>\n

        \"\"
        Figure 3-4
        The Right-hand Rule<\/figcaption><\/figure>\n
        \n

        Drawing with theZ Coordinate<\/h2>\n<\/div>\n

        While drawing in 2D, you only had to worry about entering the X and Y coordinates. Since the Z coordinate was omitted, AutoCAD used the default value of zero. When drawing in 3D, you must add the Z value in some coordinate input. For example, to enter the coordinates X2Y3Z4, enter 2,3,4 if it is an absolute coordinate and @2,3,4 if it is a relative coordinate.<\/p>\n

        Absolute X0Y0Z0<\/h2>\n

        The absolute coordinate 0,0,0 is the origin of the World Coordinate System. This is the same location used in 2D when only 0,0 was entered. This is an important coordinate location as everything drawn in model space relates back to this location. Keep this in mind when drawing all future models. It is especially important when constructing models that relate to real world locations. For example, when drawing a map, X0Y0Z0 is located at the equator and your model must be drawn in relation to that location.<\/p>\n

        USER TIP:<\/strong> Similar to working in 2D, it is important to save the objects drawn for construction purposes. In all lab exercises, daw all construction objects on layer Construction and do not delete them when the model is complete. After completing the model, freeze layer Construction. When required, simply thaw layer Construction to display the construction objects.<\/div>\n

        WORK ALONG: Drawing 3D Wireframe Models with the UCS Located at the WCS<\/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 the drawing with the name: AutoCAD 3D Workalong 03-1<\/span>. (Figure Step 2)<\/p>\n

        \"\"
        Figure Step 2
        Dimensioned Solid Model<\/figcaption><\/figure>\n
        AUTHOR’S COMMENTS:<\/strong> Constructing models with the UCS located at the WCS is not the best method of constructing models. As a learning tool for this module, it simplifies model construction. This will help you when you draw your first few models.<\/div>\n

        Step 3<\/h2>\n

        Set the current view to SE Isometric. (Figure Step 3)<\/p>\n

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

        Step 4<\/h2>\n

        Ensure that the UCS Icon is enabled (On) and the Origin is enabled as shown in Module 1 WORKALONG: Using the UCSICON, VIEW, and 3DFORBIT Commands.<\/p>\n

        Step 5<\/h2>\n

        Set layer: Model<\/span> as the current layer. Enter the LINE command, as shown below, to draw the lines to start the construction of the model. (Figure Step 5)<\/p>\n

        Command: LINE<\/strong><\/p>\n

        Specify first point: 0,0,0<\/strong><\/p>\n

        Specify next point or [Undo]: @2,0<\/strong><\/p>\n

        (Since you are working at Z zero, you can omit the Z value.)<\/em><\/span><\/p>\n

        Specify next point or [Undo]: @2,2 <\/strong><\/p>\n

        Specify next point or [Close\/Undo]: @4,0 <\/strong><\/p>\n

        Specify next point or [Close\/Undo]: @0,2 <\/strong><\/p>\n

        Specify next point or [Close\/Undo]: @-8,0 <\/strong><\/p>\n

        Specify next point or [Close\/Undo]: C <\/strong><\/p>\n

        Command:<\/p>\n

        (Draw the object that is located on the XY axis as you did in 2D.)<\/em><\/span><\/p>\n

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

        Step 6<\/h2>\n

        Using the OFFSET command, offset the two lines 1.5 units as shown in the figure. Change the layer properties of the two lines to layer: Construction. (Figure Step 6)<\/p>\n

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

        Step 7<\/h2>\n

        Use the CIRCLE command to draw a 2 diameter circle with its centre located at the intersection of the two construction lines. (Figure Step 7)<\/p>\n

        \"\"
        Figure Step 7<\/figcaption><\/figure>\n

        Step 8<\/h2>\n

        Freeze layer: Construction<\/span>. Enter the COPY command, as shown below, and copy the three lines and the circle 4 units in the positive Z direction. (Figure Step 8).<\/p>\n

        Command: COPY<\/strong><\/p>\n

        Select objects:<\/span><\/p>\n

        (Select the three lines and the circle as shown in Figure Step 8.)<\/em><\/span><\/p>\n

        Select objects:<\/p>\n

        Specify base point or displacement, or [Multiple]: 0,0,0<\/strong><\/p>\n

        Specify second point of displacement or <use first point as displacement>: @0,0,4<\/strong><\/p>\n

        (Copy the 4 objects 4 units in the positive Z direction. Looking at the UCS or using the right- hand rule will indicated if it is a positive or negative direction.)<\/span><\/em><\/p>\n

        Command:<\/p>\n

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

        Step 9<\/h2>\n

        Using the 3DFORBIT command, orbit the model slightly. (Figure Step 9)<\/p>\n

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

        Step 10<\/h2>\n

        Using the COPY command, copy the 2 lines 2 units in the positive Z directions. (Figure Step 10)<\/p>\n

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

        Step 11<\/h2>\n

        Use the LINE command to draw six lines between the ends of the existing lines. Ensure that you snap to the ends of the lines. (Figure Step 11)<\/p>\n

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

        Step 12<\/h2>\n

        Using the COPY command, copy the short line located at the right end of the model two times. Ensure that you use snap mode to locate the lines exactly. (Figure Step 12)<\/p>\n

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

        Step 13<\/h2>\n

        Draw three lines between the ends of the existing lines. Ensure to snap to the ends of the existing lines. (Figure Step 13)<\/p>\n

        \"\"
        Figure Step 13<\/figcaption><\/figure>\n

        Step 14<\/h2>\n

        Using the VIEW command, save the current view with the name: Working Isometric. (Figure Step 14)<\/p>\n

        \"\"
        Figure Step 14<\/figcaption><\/figure>\n

        Step 15<\/h2>\n

        Change the current view to SE Isometric. (Figure Step 15)<\/p>\n

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

        Step 16<\/h2>\n

        Enter the UNITS command. In the Units dialogue box, set the Insertion Units to Inches. Insert the key: AutoCAD 3D Workalong 03-1<\/span>. It will overlay the model with a magenta model. (Figure Step 16)<\/p>\n

        \"\"
        Figure Step 16<\/figcaption><\/figure>\n
        AUTHOR’S COMMENTS:<\/strong> If you require help doing this, redo Module 2.<\/div>\n

        Step 17<\/h2>\n

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

        WORK ALONG: Drawing 3D Wireframe Models With the UCS Located at the WCS<\/h1>\n

        \u00a0Step 1<\/h2>\n

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

        Step 2<\/h2>\n

        Save the drawing with the name: AutoCAD 3D Workalong 03-2<\/span>. (Figure Step 2)<\/p>\n

        \"\"
        Figure Step 2
        Dimensioned Solid Model<\/figcaption><\/figure>\n
        MUST KNOW:<\/strong> AutoCAD has two distinct three-dimensional coordinate systems: the World Coordinate System (WCS) and the User Coordinate System (UCS). The World Coordinate System is located at the absolute coordinates X0Y0Z0. It is a fixed coordinate system and cannot be moved. The WCS is normally not used to construct models. The UCS the coordinate system that is used to construct 3D models. The UCS can be placed exactly at the WCS or at any location in 3D space.<\/div>\n

        Step 3<\/h2>\n

        Set the current view to SE Isometric. (Figure Step 3)<\/p>\n

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

        Step 4<\/h2>\n

        Ensure that the UCS Icon is enabled (On) and the Origin is enabled as shown in Module 1, WORKALONG: Using the UCSICON, VIEW, and 3DFORBIT Commands.<\/p>\n

        Step 5<\/h2>\n

        Set layer: Model<\/span> as the current layer. Draw the shape of the top of the object. Use the ARRAY command to speed up the construction. (Figure Step 5)<\/p>\n

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

        Step 6<\/h2>\n

        Using the COPY command, as shown below, copy all of the objects 10 units in the negative Z direction. (Figure Step 6)<\/p>\n

        Command: COPY<\/strong><\/p>\n

        Select objects:<\/p>\n

        (Select all objects.)<\/em><\/span><\/p>\n

        Select objects:<\/p>\n

        Specify base point or displacement, or [Multiple]: 0,0,0<\/strong><\/p>\n

        Specify second point of displacement or <use first point as displacement>: @0,0,-10<\/strong><\/p>\n

        Command:<\/p>\n

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

        Step 7<\/h2>\n

        Using the 3DFORBIT command, orbit the model slightly until it appears similar to the figure. (Figure Step 7)<\/p>\n

        \"\"
        Figure Step 7<\/figcaption><\/figure>\n

        Step 8<\/h2>\n

        Draw the vertical lines by snapping to the endpoints to complete the wireframe model. (Figure Step 8)<\/p>\n

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

        Step 9<\/h2>\n

        Using the VIEW command, save the current view with the name: Working Isometric<\/span>. (Figure Step 9)<\/p>\n

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

        Step 10<\/h2>\n

        Change the view to SE Isometric. (Figure Step 10)<\/p>\n

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

        Step 11<\/h2>\n

        Enter the UNITS command. In the Units dialogue box, set the Insertion Units to Millimeters. Insert the key:<\/p>\n

        AutoCAD 3D Workalong 03-2<\/span>. It will overlay the model with a magenta model. (Figure Step 11)<\/p>\n

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

        Step 12<\/h2>\n

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

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

        Key Principles in Module 3<\/p>\n<\/header>\n

        \n
          \n
        1. AutoCAD has two distinct three dimensional coordinate systems: the World Coordinate System (WCS) and the User Coordinate System (UCS).<\/li>\n
        2. The World Coordinate System is permanently located at the absolute coordinates It is a fixed coordinate system which can never be moved. The WCS is normally not used to construct models.<\/li>\n
        3. The User Coordinate System is the coordinate system that is normally used to construct 3D The UCS can be placed exactly at the WCS or at any location in 3D space.<\/li>\n
        4. AutoCAD uses the right-hand rule to find the positive Z To use the right-hand rule, you must first know the positive X and Y directions of the current UCS. Using your right hand, point the thumb in the direction of the positive X axis. Extend your index finger in the direction of the positive Y axis. Your middle finger indicates the direction of the positive Z axis.<\/li>\n
        5. The absolute coordinate 0,0,0 is the origin of the world coordinate This is the same point used when drawing in 2D when 0,0 was entered. This is an important coordinate location as everything drawn in model space relates back to this location.<\/li>\n<\/ol>\n<\/div>\n<\/div>\n

          Lab Exercise 3-1<\/h1>\n

          Time allowed: 45 minutes.<\/p>\n\n\n\n\n
          Drawing Name<\/th>\nTemplate<\/th>\nUnits<\/th>\n<\/tr>\n
          AutoCAD 3D Lab 03-1<\/td>\n3D Layout English<\/td>\nInches<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          Step 1<\/h2>\n

          Save and name the drawing: AutoCAD 3D Lab 03-1<\/span>.<\/p>\n

          Step 2<\/h2>\n

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

          Step 3<\/h2>\n

          Draw a wireframe model of the object shown in the figure. (Figure Step 3A and 3B)<\/p>\n

          \"\"
          Figure Step 3A
          Dimensioned Solid Model<\/figcaption><\/figure>\n
          \"\"
          Figure Step 3B Completed Wireframe Model SE Isometric View<\/figcaption><\/figure>\n

          Step 4<\/h2>\n

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

          Step 5<\/h2>\n

          Save the isometric working view with the name: Working Isometric<\/span>.<\/p>\n

          Step 6<\/h2>\n

          When complete, freeze layer: Construction.<\/p>\n

          Step 7<\/h2>\n

          Enter the UNITS command. In the Units dialogue box, set the Insertion Units to Inches.<\/p>\n

          Step 8<\/h2>\n

          Check your drawing with the key. The key name is the same as the drawing name.<\/p>\n

          CONSTRUCTION TECHNIQUES:<\/strong> The following steps are the construction technique suggested by the author to help you learn how to construct objects using AutoCAD. It is only the suggested method and if you can complete the drawing accurately using a different construction technique, that is what is important. You may want to compare your construction technique with the authors.<\/div>\n

          Hint 1<\/h2>\n

          \"\"<\/p>\n

          \"\"
          Figure Hint 1
          Construction Steps<\/figcaption><\/figure>\n

          Lab Exercise 3-2<\/h1>\n

          Time allowed: 45 minutes.<\/p>\n\n\n\n\n
          Drawing Name<\/th>\nTemplate<\/th>\nUnits<\/th>\n<\/tr>\n
          AutoCAD 3D Lab 03-2<\/td>\n3D Layout English<\/td>\nMillimeters<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          Step 1<\/h2>\n

          Save the drawing with the name: AutoCAD 3D Lab 03-2<\/span>.<\/p>\n

          Step 2<\/h2>\n

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

          Step 3<\/h2>\n

          Draw a wireframe model of the object shown in the figure. (Figure Step 3A, 3B, 3C, and 3D)<\/p>\n

          \"\"
          Figure Step 3A
          Dimensioned Solid Model<\/figcaption><\/figure>\n
          \"\"
          Figure Step 3B Completed Wireframe Model SE Isometric View<\/figcaption><\/figure>\n
          \"\"
          Figure Step 3C Key Detail<\/figcaption><\/figure>\n
          \"\"
          Figure Step 3D View of Keyway – Orbited<\/figcaption><\/figure>\n

          Step 4<\/h2>\n

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

          Step 5<\/h2>\n

          Save the isometric working view with the name: Working Isometric<\/span>.<\/p>\n

          Step 6<\/h2>\n

          When complete, freeze layer: Construction<\/span>.<\/p>\n

          Step 7<\/h2>\n

          Enter the UNITS command. In the Units dialogue box, set the Insertion Units to Millimeters.<\/p>\n

          Step 8<\/h2>\n

          Check your drawing with the key. The key name is the same as the drawing name.<\/p>\n

          CONSTRUCTION TECHNIQUES: <\/strong>The following steps are the construction technique suggested by the author to help you learn how to construct objects using AutoCAD. It is only the suggested method and if you can complete the drawing accurately using a different construction technique, that is what is important. You may want to compare your construction technique with the authors.<\/div>\n

          Hint 1<\/h2>\n
          \"\"<\/div>\n
          \"\"<\/div>\n
          \n
          \"\"
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