{"id":254,"date":"2021-03-26T14:12:36","date_gmt":"2021-03-26T18:12:36","guid":{"rendered":"https:\/\/opentextbc.ca\/autocad3d\/chapter\/user-coordinate-system-part-1\/"},"modified":"2021-11-04T11:37:06","modified_gmt":"2021-11-04T15:37:06","slug":"user-coordinate-system-part-1","status":"publish","type":"chapter","link":"https:\/\/opentextbc.ca\/autocad3d\/chapter\/user-coordinate-system-part-1\/","title":{"raw":"Module 4: User Coordinate System – Part 1","rendered":"Module 4: User Coordinate System – Part 1"},"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 User Coordinate System and the User Construction Plane.<\/li>\n \t
  2. Apply the UCSMAN command.<\/li>\n \t
  3. Draw 3D models using the User Coordinate System located at the World or at the predefined orthographic UCS locations only.<\/li>\n<\/ol>\n<\/div>\n<\/div>\n

    IMPORTANT - PLEASE READ BEFORE COMPLETING THIS MODULE<\/span><\/h1>\n\u00a0<\/strong>AutoCAD 2015 has a bug using the LINE command in 3D. The LINE command works properly when either the World or Top is the current UCS. When any other UCS is the current UCS, the cursor of the LINE command will display the new line in the wrong location. It locates the line in the correct location after you execute the LINE command. It displays correctly when snapping to existing objects and only appears wrong when using coordinates or drawing lines freehand.\n\nA good workaround is to use the PLINE command rather than the LINE command, as it works correctly. After you complete the PLINE command, you can explode the pline to create a line object.\n\nThis bug is only in AutoCAD 2015. The LINE command in AutoCAD 2016, 2017 and 2018 works in all UCS locations.\n

    The User Coordinate System<\/h2>\nThe User Coordinate System (UCS) is the coordinate system used to construct 3D models. It can be located at the WCS or at any location or orientation in 3D space. Being able to locate and orientate the UCS anywhere in 3D space is the secret of 3D modeling.\n

    The User Construction Plane<\/h2>\nIf you draw an imaginary line from the X axis to the Y axis on the user coordinate system, it forms a imaginary triangular plane as shown in Figure 4-1. When you locate the UCS onto the 3D model, as shown in Figure 4-2, you can see this imaginary triangular plane laying on the surface. Next, picture the plane expanded to fill the whole surface it is located on. See Figure 4-3. This surface is called the User Construction Plane <\/em><\/span>(UCP).\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"106\"]\"\" Figure 4-1
    User Construction Plane[\/caption]\n\nThe easiest method of drawing 3D models is to locate and orientate the user construction plane to lie on the surface you currently want to insert or modify object(s) on. Relocate the location of the UCS and continue your model construction until you complete the model. You can use the Z axis to copy the object(s) and draw at a depth parallel to the UCP.\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"263\"]\"\" Figure 4-2
    User Construction Plane on the WCS[\/caption]\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"263\"]\"\" Figure 4-3
    UCS Plane expanded to cover the Whole Surface[\/caption]\n\nBy relocating and orientating the UCS to different locations, you can draw or modify objects on any surface you want. Figure 4-4 shows the user construction plane located on the right side of the model and Figure 4-5 shows it located on the inclined surface.\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"275\"]\"\" Figure 4-4
    UCP located on the Right Side[\/caption]\n\nIn this module, all model construction will be drawn in the with the UCS located at the World or in one of the preset orthographic locations only. In Module 5, locating the UCS anywhere in model space will be taught.\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"259\"]\"\" Figure 4-5
    UCP located on an Inclined Surface[\/caption]\n\n
    \n

    AutoCAD Command: UCSMAN<\/p>\n\n<\/header>\n

    \n\nThe UCSMAN command is used to locate, orientate, and manage the UCS.\n\nShortcut: none\n\n[caption id=\"attachment_204\" align=\"aligncenter\" width=\"285\"]\"\" Tools Pull-down[\/caption]\n\n[caption id=\"attachment_204\" align=\"aligncenter\" width=\"280\"]\"\" UCS II Toolbar[\/caption]\n\n[caption id=\"attachment_204\" align=\"aligncenter\" width=\"494\"]\"\" Home Ribbon[\/caption]\n\n<\/div>\n<\/div>\n

    WORK ALONG: Moving the UCS to the Preset Locations<\/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 04-1<\/span>. Save it in the folder: CAD Courses\/AutoCAD 3D\/Lab Exercises\n

    Step 3<\/h2>\nSet the current UCS to World. Enter the UNITS command. In the Units dialogue box, set the Insertion Units to Inches. Using the INSERT command, insert the block: AutoCAD 3D Lab 01-1<\/span> at the coordinates 0,0,0. Explode the block.\n

    Step 4<\/h2>\nSet the current view to SE Isometric. Your wireframe model should appear as shown in the figure. (Figure Step 4)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"227\"]\"\" Figure Step 4[\/caption]\n

    Step 5<\/h2>\nEnter the UCSMAN command. It will open the UCS dialogue box. Enable the Settings tab and ensure that the settings in the dialogue box matches the figure. (Figure Step 5)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"427\"]\"\" Figure Step 5[\/caption]\n

    Step 6<\/h2>\nEnable the Orthographic UCS's tab. Select Front and then click the Set Current button. (Figure Step 6)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"428\"]\"\" Figure Step 6[\/caption]\n

    Step 7<\/h2>\nThe wireframe model should now appear as shown in the figure. Notice how the XY axis lies on the front plane of the model. (Figure Step 7)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"260\"]\"\" Figure Step 7[\/caption]\n

    Step 8<\/h2>\nUsing either the UCS II toolbar or the Home tab ribbon. (Figure Step 8A and 8B)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"244\"]\"\" Figure Step 8A[\/caption]\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"252\"]\"\" Figure Step 8B[\/caption]\n

    Step 9<\/h2>\nSet the current UCS location to Right and the UCS icon will move onto the right side of the model. Note that the XY plane is now located on the right side plane of the wireframe model. (Figure Step 9A and 9B)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"415\"]\"\" Figure Step 9A[\/caption]\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"151\"]\"\" Figure Step 9B[\/caption]\n\n
    MUST KNOW: <\/strong>To draw in 3D, it is important to visualize a user construction plane located on the X and Y axis. The easiest method of drawing 3D models is to locate and orientate the user construction plane on the surface you are currently modifying. Relocate the location of the UCS and continue model construction until the model is complete.<\/div>\n

    Step 10<\/h2>\nClick the UCS command icon as shown in the figures. With osnap enabled, snap to the end of the line. Note that the UCS icon has now moved to the end of the line that you just selected but it remains located on the right side plane. (Figure Step 10A, 10B, 10C, and 10D)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"244\"]\"\" Figure Step 10A[\/caption]\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"253\"]\"\" Figure Step 10B[\/caption]\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"436\"]\"\" Figure Step 10C[\/caption]\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"414\"]\"\" Figure Step 10D[\/caption]\n

    Step 11<\/h2>\nClick Top from the pull-down list. The UCS icon will move onto the top plane of the model. In this case, it locates itself on the WCS. (Figure Step 11)\n\n\"\"\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"419\"]\"\" Figure Step 11[\/caption]\n

    Step 12<\/h2>\nUsing the UCS command, move the UCS to corner as shown in the figure. Ensure that you snap to the end of the line. Note how the name of the UCS will display ' Unnamed '. (Figure Step 12)\n\n\"\"\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"414\"]\"\" Figure Step 12[\/caption]\n

    Step 13<\/h2>\nClick World from the pull-down list. The UCS icon will move onto the WCS. (Figure Step 13)\n\n\"\"\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"419\"]\"\" Figure Step 13[\/caption]\n

    Step 14<\/h2>\nSave and close the drawing.\n

    WORK ALONG: Drawing 3D Wireframe Models Using the UCS<\/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 04-2<\/span>. (Figure Step 2A and 2B)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"500\"]\"\" Figure Step 2A
    Dimension Wireframe Model[\/caption]\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"326\"]\"\" Figure Step 2B
    Solid Model SE Isometric View[\/caption]\n

    Step 3<\/h2>\nEnsure that the current UCS is set to World and the current view is set to SE Isometric.\n

    Step 4<\/h2>\nSet layer: Model as the current layer.\n

    Step 5<\/h2>\nUsing the LINE command, draw the lines to outline the Top view. (Figure Step 5)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"500\"]\"\" Figure Step 5[\/caption]\n

    Step 6<\/h2>\nCopy all of the lines 3 units in the positive Z direction. (Figure Step 6)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"373\"]\"\" Figure Step 6[\/caption]\n

    Step 7<\/h2>\nUsing the 3DFORBIT command, orbit the model slightly. (Figure Step 7)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"338\"]\"\" Figure Step 7[\/caption]\n\n
    AUTHOR'S COMMENTS:<\/strong> I orbited the model so that the corner does not line up and the lines in the front do not cover the lines in the back.<\/div>\n

    Step 8<\/h2>\nUsing the LINE command, draw the 6 vertical lines. Ensure that you enable object snap and snap to endpoints of the existing lines. (Figure Step 8)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"300\"]\"\" Figure Step 8[\/caption]\n

    Step 9<\/h2>\nSet the current UCS to Right and then locate the icon by snapping to the corner of the model as shown in the figure. (Figure Step 9)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"300\"]\"\" Figure Step 9[\/caption]\n

    Step 10<\/h2>\nDraw the necessary construction lines using the OFFSET command. Change their layer to layer: Construction. Draw the arc and the circle. (Figure Step 10)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"300\"]\"\" Figure Step 10[\/caption]\n

    Step 11<\/h2>\nCopy the arc and the circle in the negative Z direction. (Figure Step 11)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"287\"]\"\" Figure Step 11[\/caption]\n

    Step 12<\/h2>\nTrim or delete necessary lines. (Figure Step 12)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"276\"]\"\" Figure Step 12[\/caption]\n

    Step 13<\/h2>\nSet the current UCS to Front and then locate it to the corner as shown in the figure. (Figure Step 13)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"276\"]\"\" Figure Step 13[\/caption]\n

    Step 14<\/h2>\nDraw the necessary construction lines using the OFFSET command. Change their layer to layer: Construction<\/span>. Draw the object lines as shown in the figure. (Figure Step 14)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"293\"]\"\" Figure Step 14[\/caption]\n

    Step 15<\/h2>\nCopy the lines in the negative Z direction and add the necessary object lines. (Figure Step 15)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"287\"]\"\" Figure Step 15[\/caption]\n

    Step 16<\/h2>\nTrim or delete the necessary lines and freeze layer: Construction<\/span> to complete the wireframe model. (Figure Step 16)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"281\"]\"\" Figure Step 16[\/caption]\n

    Step 17<\/h2>\nChange the current view to SE Isometric. (Figure Step 17)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"282\"]\"\" Figure Step 17[\/caption]\n

    Step 18<\/h2>\nSet the current UCS to World. (Figure Step 18)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"287\"]\"\" Figure Step 18[\/caption]\n\n
    AUTHOR'S COMMENTS:<\/strong> The UCS must always be located on the World when inserting a key.<\/div>\n

    Step 19<\/h2>\nEnter the UNITS command. In the Units dialogue box, set the Insertion Units to Inches.\n\nInsert the key: AutoCAD 3D Workalong 04-2<\/span>. It will overlay the model with a magenta wireframe model. (Figure Step 19)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"304\"]\"\" Figure Step 19[\/caption]\n\n
    \n\nUSER TIP: <\/strong>It is best to display the UCS icon at its origin point when you are constructing 3D wireframe models. See the Settings tab in the UCS dialogue box shown below.If the model is zoomed to fill the Graphic window, the UCS icon will appear to be located off the origin point. It actually is not, it simply cannot display where it should. To correct, zoom out to make the model display smaller and the icon will automatically display at the UCS origin.\n\n\"\"\n\n<\/div>\n
    \n\nMUST KNOW: <\/strong>The coordinate location X0Y0Z0 is always referenced to the origin of the UCS. If the UCS is located at the WCS, its origin is the absoluteX0Y0Z0. If the UCS is at any other location, the coordinates location X0Y0Z0 is the relative X0Y0Z0. To work with absolute coordinates, the UCS must <\/strong>be located at the WCS. Use the UCS II toolbar or the UCS dialogue box and change the UCS location to World. When the UCS is at the WCS, the icon will display a small square.\n\nAnother way to work with absolute coordinates is to place an asterisk (*) preceding the coordinate value. i.e.\n\n@*4,0,0 specifies a point four units in the X direction of the last point entered relative to the absolute X0Y0Z0 or the WCS.\n\n@4,0,0 specifies a point four units in the X direction of the last point entered relative to the current UCS. *0,0,0 specifies absolute X0Y0Z0 of the WCS regardless of the current location of the UCS.\"\"\n\n\"\"\n\n<\/div>\n

    Key Principles<\/h1>\n
    \n

    Key Principles in Module 4<\/p>\n\n<\/header>\n

    \n
      \n \t
    1. The User Coordinate System (UCS) is the coordinate system used to construct 3D It can be located at the WCS or at any location or orientation in 3D space. Being able to locate and orientate the UCS anywhere is the secret of 3D modeling.<\/li>\n \t
    2. Another way to work with absolute coordinates is to place an asterisk (*) preceding the coordinate i.e.<\/li>\n<\/ol>\n

      @*4,0,0 specifies a point four units in the X direction of the last point entered relative to the absolute X0Y0Z0 or the WCS.<\/p>\n

      *0,0,0 specifies absolute X0Y0Z0 of the WCS regardless of the current location of the UCS.<\/p>\n\n<\/div>\n<\/div>\n

      Lab Exercise 4-1<\/h1>\nTime allowed: 40 minutes.\n\n\n\n\n
      Drawing Name<\/th>\nTemplate<\/th>\nUnits<\/th>\n<\/tr>\n
      AutoCAD 3D Lab 04-1<\/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 04-1<\/span> as shown above.\n

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

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

      Step 4<\/h2>\nDraw a wireframe model of the object. (Figure Step 4A and 4B)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"500\"]\"\" Figure Step 4A
      Dimensioned Solid Model[\/caption]\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"198\"]\"\" Figure 4B Completed Wireframe Model SE Isometric View[\/caption]\n

      Step 5<\/h2>\nWhen complete, freeze layer: Construction<\/span>.\n

      Step 6<\/h2>\nEnter the UNITS command. In the Units dialogue box, set the Insertion Units to Inches.\n

      Step 7<\/h2>\nChange the current UCS to World and check the model with the key.\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[caption id=\"attachment_253\" align=\"aligncenter\" width=\"600\"]\"\" Figure Hint 1
      Construction Steps[\/caption]\n

      Lab Exercise 4-2<\/h1>\nTime allowed: 40 minutes.\n\n\n\n\n
      Drawing Name<\/th>\nTemplate<\/th>\nUnits<\/th>\n<\/tr>\n
      AutoCAD 3D Lab 04-2<\/td>\n3D Layout Metric<\/td>\nMillimeters<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      Step 1<\/h2>\nSave and name the drawing: AutoCAD 3D Lab 04-2<\/span>, as shown above.\n

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

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

      Step 4<\/h2>\nDraw a wireframe model of the object. (Figure Step 4A, 4B, and 4C)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"500\"]\"\" Figure Step 4A
      Dimensioned Solid Model[\/caption]\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"149\"]\"\" Figure Step 4B Completed Wireframe Model SE Isometric View[\/caption]\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"312\"]\"\" Figure Step 4C
      Key Detail[\/caption]\n\n
      AUTHOR'S COMMENTS:<\/strong> Start the first view on the Front UCS. Before you start drawing, change the location of the UCS to Front.<\/div>\n

      Step 5<\/h2>\nWhen complete, freeze layer: Construction<\/span>.\n

      Step 6<\/h2>\nEnter the UNITS command. In the Units dialogue box, set the Insertion Units to Millimeters.\n

      Step 7<\/h2>\nChange the current UCS to World and check the model with the key.\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[caption id=\"attachment_253\" align=\"aligncenter\" width=\"583\"]\"\" Figure Hint 1[\/caption]\n

      Lab Exercise 4-3<\/h1>\nTime allowed: 40 minutes.\n\n\n\n\n
      Drawing Name<\/th>\nTemplate<\/th>\nUnits<\/th>\n<\/tr>\n
      AutoCAD 3D Lab 04-3<\/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 04-3<\/span>, as shown above.\n

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

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

      Step 4<\/h2>\nDraw a wireframe model of the object. (Figure Step 4A, 4B, and 4C)\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"500\"]\"\" Figure Step 4A Dimensioned Solid Module SE Isometric View[\/caption]\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"187\"]\"\" Figure Step 4B
      Completed Wireframe Model SE Isometric View[\/caption]\n\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"276\"]\"\" Figure Step 4C Solid Model Rotated View[\/caption]\n\n
      AUTHOR'S COMMENTS: <\/strong>Start the first view on the Right UCS. Before you start drawing, change the location of the UCS to Right.<\/div>\n

      Step 5<\/h2>\nWhen complete, freeze layer: Construction<\/span>.\n

      Step 6<\/h2>\nEnter the UNITS command. In the Units dialogue box, set the Insertion Units to Inches.\n

      Step 7<\/h2>\nChange the current UCS to World and check the model with the key.\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.\n<\/strong><\/div>\n

      Hint 1<\/h2>\n[caption id=\"attachment_253\" align=\"aligncenter\" width=\"600\"]\"\" Figure Hint 1[\/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. Describe the User Coordinate System and the User Construction Plane.<\/li>\n
      2. Apply the UCSMAN command.<\/li>\n
      3. Draw 3D models using the User Coordinate System located at the World or at the predefined orthographic UCS locations only.<\/li>\n<\/ol>\n<\/div>\n<\/div>\n

        IMPORTANT – PLEASE READ BEFORE COMPLETING THIS MODULE<\/span><\/h1>\n

        \u00a0<\/strong>AutoCAD 2015 has a bug using the LINE command in 3D. The LINE command works properly when either the World or Top is the current UCS. When any other UCS is the current UCS, the cursor of the LINE command will display the new line in the wrong location. It locates the line in the correct location after you execute the LINE command. It displays correctly when snapping to existing objects and only appears wrong when using coordinates or drawing lines freehand.<\/p>\n

        A good workaround is to use the PLINE command rather than the LINE command, as it works correctly. After you complete the PLINE command, you can explode the pline to create a line object.<\/p>\n

        This bug is only in AutoCAD 2015. The LINE command in AutoCAD 2016, 2017 and 2018 works in all UCS locations.<\/p>\n

        The User Coordinate System<\/h2>\n

        The User Coordinate System (UCS) is the coordinate system used to construct 3D models. It can be located at the WCS or at any location or orientation in 3D space. Being able to locate and orientate the UCS anywhere in 3D space is the secret of 3D modeling.<\/p>\n

        The User Construction Plane<\/h2>\n

        If you draw an imaginary line from the X axis to the Y axis on the user coordinate system, it forms a imaginary triangular plane as shown in Figure 4-1. When you locate the UCS onto the 3D model, as shown in Figure 4-2, you can see this imaginary triangular plane laying on the surface. Next, picture the plane expanded to fill the whole surface it is located on. See Figure 4-3. This surface is called the User Construction Plane <\/em><\/span>(UCP).<\/p>\n

        \"\"
        Figure 4-1
        User Construction Plane<\/figcaption><\/figure>\n

        The easiest method of drawing 3D models is to locate and orientate the user construction plane to lie on the surface you currently want to insert or modify object(s) on. Relocate the location of the UCS and continue your model construction until you complete the model. You can use the Z axis to copy the object(s) and draw at a depth parallel to the UCP.<\/p>\n

        \"\"
        Figure 4-2
        User Construction Plane on the WCS<\/figcaption><\/figure>\n
        \"\"
        Figure 4-3
        UCS Plane expanded to cover the Whole Surface<\/figcaption><\/figure>\n

        By relocating and orientating the UCS to different locations, you can draw or modify objects on any surface you want. Figure 4-4 shows the user construction plane located on the right side of the model and Figure 4-5 shows it located on the inclined surface.<\/p>\n

        \"\"
        Figure 4-4
        UCP located on the Right Side<\/figcaption><\/figure>\n

        In this module, all model construction will be drawn in the with the UCS located at the World or in one of the preset orthographic locations only. In Module 5, locating the UCS anywhere in model space will be taught.<\/p>\n

        \"\"
        Figure 4-5
        UCP located on an Inclined Surface<\/figcaption><\/figure>\n
        \n
        \n

        AutoCAD Command: UCSMAN<\/p>\n<\/header>\n

        \n

        The UCSMAN command is used to locate, orientate, and manage the UCS.<\/p>\n

        Shortcut: none<\/p>\n

        \"\"
        Tools Pull-down<\/figcaption><\/figure>\n
        \"\"
        UCS II Toolbar<\/figcaption><\/figure>\n
        \"\"
        Home Ribbon<\/figcaption><\/figure>\n<\/div>\n<\/div>\n

        WORK ALONG: Moving the UCS to the Preset Locations<\/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 04-1<\/span>. Save it in the folder: CAD Courses\/AutoCAD 3D\/Lab Exercises<\/p>\n

        Step 3<\/h2>\n

        Set the current UCS to World. Enter the UNITS command. In the Units dialogue box, set the Insertion Units to Inches. Using the INSERT command, insert the block: AutoCAD 3D Lab 01-1<\/span> at the coordinates 0,0,0. Explode the block.<\/p>\n

        Step 4<\/h2>\n

        Set the current view to SE Isometric. Your wireframe model should appear as shown in the figure. (Figure Step 4)<\/p>\n

        \"\"
        Figure Step 4<\/figcaption><\/figure>\n

        Step 5<\/h2>\n

        Enter the UCSMAN command. It will open the UCS dialogue box. Enable the Settings tab and ensure that the settings in the dialogue box matches the figure. (Figure Step 5)<\/p>\n

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

        Step 6<\/h2>\n

        Enable the Orthographic UCS’s tab. Select Front and then click the Set Current button. (Figure Step 6)<\/p>\n

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

        Step 7<\/h2>\n

        The wireframe model should now appear as shown in the figure. Notice how the XY axis lies on the front plane of the model. (Figure Step 7)<\/p>\n

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

        Step 8<\/h2>\n

        Using either the UCS II toolbar or the Home tab ribbon. (Figure Step 8A and 8B)<\/p>\n

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

        Step 9<\/h2>\n

        Set the current UCS location to Right and the UCS icon will move onto the right side of the model. Note that the XY plane is now located on the right side plane of the wireframe model. (Figure Step 9A and 9B)<\/p>\n

        \"\"
        Figure Step 9A<\/figcaption><\/figure>\n
        \"\"
        Figure Step 9B<\/figcaption><\/figure>\n
        MUST KNOW: <\/strong>To draw in 3D, it is important to visualize a user construction plane located on the X and Y axis. The easiest method of drawing 3D models is to locate and orientate the user construction plane on the surface you are currently modifying. Relocate the location of the UCS and continue model construction until the model is complete.<\/div>\n

        Step 10<\/h2>\n

        Click the UCS command icon as shown in the figures. With osnap enabled, snap to the end of the line. Note that the UCS icon has now moved to the end of the line that you just selected but it remains located on the right side plane. (Figure Step 10A, 10B, 10C, and 10D)<\/p>\n

        \"\"
        Figure Step 10A<\/figcaption><\/figure>\n
        \"\"
        Figure Step 10B<\/figcaption><\/figure>\n
        \"\"
        Figure Step 10C<\/figcaption><\/figure>\n
        \"\"
        Figure Step 10D<\/figcaption><\/figure>\n

        Step 11<\/h2>\n

        Click Top from the pull-down list. The UCS icon will move onto the top plane of the model. In this case, it locates itself on the WCS. (Figure Step 11)<\/p>\n

        \"\"<\/p>\n

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

        Step 12<\/h2>\n

        Using the UCS command, move the UCS to corner as shown in the figure. Ensure that you snap to the end of the line. Note how the name of the UCS will display ‘ Unnamed ‘. (Figure Step 12)<\/p>\n

        \"\"<\/p>\n

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

        Step 13<\/h2>\n

        Click World from the pull-down list. The UCS icon will move onto the WCS. (Figure Step 13)<\/p>\n

        \"\"<\/p>\n

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

        Step 14<\/h2>\n

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

        WORK ALONG: Drawing 3D Wireframe Models Using the UCS<\/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 04-2<\/span>. (Figure Step 2A and 2B)<\/p>\n

        \"\"
        Figure Step 2A
        Dimension Wireframe Model<\/figcaption><\/figure>\n
        \"\"
        Figure Step 2B
        Solid Model SE Isometric View<\/figcaption><\/figure>\n

        Step 3<\/h2>\n

        Ensure that the current UCS is set to World and the current view is set to SE Isometric.<\/p>\n

        Step 4<\/h2>\n

        Set layer: Model as the current layer.<\/p>\n

        Step 5<\/h2>\n

        Using the LINE command, draw the lines to outline the Top view. (Figure Step 5)<\/p>\n

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

        Step 6<\/h2>\n

        Copy all of the lines 3 units in the positive Z direction. (Figure Step 6)<\/p>\n

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

        Step 7<\/h2>\n

        Using the 3DFORBIT command, orbit the model slightly. (Figure Step 7)<\/p>\n

        \"\"
        Figure Step 7<\/figcaption><\/figure>\n
        AUTHOR’S COMMENTS:<\/strong> I orbited the model so that the corner does not line up and the lines in the front do not cover the lines in the back.<\/div>\n

        Step 8<\/h2>\n

        Using the LINE command, draw the 6 vertical lines. Ensure that you enable object snap and snap to endpoints of the existing lines. (Figure Step 8)<\/p>\n

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

        Step 9<\/h2>\n

        Set the current UCS to Right and then locate the icon by snapping to the corner of the model as shown in the figure. (Figure Step 9)<\/p>\n

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

        Step 10<\/h2>\n

        Draw the necessary construction lines using the OFFSET command. Change their layer to layer: Construction. Draw the arc and the circle. (Figure Step 10)<\/p>\n

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

        Step 11<\/h2>\n

        Copy the arc and the circle in the negative Z direction. (Figure Step 11)<\/p>\n

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

        Step 12<\/h2>\n

        Trim or delete necessary lines. (Figure Step 12)<\/p>\n

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

        Step 13<\/h2>\n

        Set the current UCS to Front and then locate it to the corner as shown in the figure. (Figure Step 13)<\/p>\n

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

        Step 14<\/h2>\n

        Draw the necessary construction lines using the OFFSET command. Change their layer to layer: Construction<\/span>. Draw the object lines as shown in the figure. (Figure Step 14)<\/p>\n

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

        Step 15<\/h2>\n

        Copy the lines in the negative Z direction and add the necessary object lines. (Figure Step 15)<\/p>\n

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

        Step 16<\/h2>\n

        Trim or delete the necessary lines and freeze layer: Construction<\/span> to complete the wireframe model. (Figure Step 16)<\/p>\n

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

        Step 17<\/h2>\n

        Change the current view to SE Isometric. (Figure Step 17)<\/p>\n

        \"\"
        Figure Step 17<\/figcaption><\/figure>\n

        Step 18<\/h2>\n

        Set the current UCS to World. (Figure Step 18)<\/p>\n

        \"\"
        Figure Step 18<\/figcaption><\/figure>\n
        AUTHOR’S COMMENTS:<\/strong> The UCS must always be located on the World when inserting a key.<\/div>\n

        Step 19<\/h2>\n

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

        Insert the key: AutoCAD 3D Workalong 04-2<\/span>. It will overlay the model with a magenta wireframe model. (Figure Step 19)<\/p>\n

        \"\"
        Figure Step 19<\/figcaption><\/figure>\n
        \n

        USER TIP: <\/strong>It is best to display the UCS icon at its origin point when you are constructing 3D wireframe models. See the Settings tab in the UCS dialogue box shown below.If the model is zoomed to fill the Graphic window, the UCS icon will appear to be located off the origin point. It actually is not, it simply cannot display where it should. To correct, zoom out to make the model display smaller and the icon will automatically display at the UCS origin.<\/p>\n

        \"\"<\/p>\n<\/div>\n

        \n

        MUST KNOW: <\/strong>The coordinate location X0Y0Z0 is always referenced to the origin of the UCS. If the UCS is located at the WCS, its origin is the absoluteX0Y0Z0. If the UCS is at any other location, the coordinates location X0Y0Z0 is the relative X0Y0Z0. To work with absolute coordinates, the UCS must <\/strong>be located at the WCS. Use the UCS II toolbar or the UCS dialogue box and change the UCS location to World. When the UCS is at the WCS, the icon will display a small square.<\/p>\n

        Another way to work with absolute coordinates is to place an asterisk (*) preceding the coordinate value. i.e.<\/p>\n

        @*4,0,0 specifies a point four units in the X direction of the last point entered relative to the absolute X0Y0Z0 or the WCS.<\/p>\n

        @4,0,0 specifies a point four units in the X direction of the last point entered relative to the current UCS. *0,0,0 specifies absolute X0Y0Z0 of the WCS regardless of the current location of the UCS.\"\"<\/p>\n

        \"\"<\/p>\n<\/div>\n

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

        Key Principles in Module 4<\/p>\n<\/header>\n

        \n
          \n
        1. The User Coordinate System (UCS) is the coordinate system used to construct 3D It can be located at the WCS or at any location or orientation in 3D space. Being able to locate and orientate the UCS anywhere is the secret of 3D modeling.<\/li>\n
        2. Another way to work with absolute coordinates is to place an asterisk (*) preceding the coordinate i.e.<\/li>\n<\/ol>\n

          @*4,0,0 specifies a point four units in the X direction of the last point entered relative to the absolute X0Y0Z0 or the WCS.<\/p>\n

          *0,0,0 specifies absolute X0Y0Z0 of the WCS regardless of the current location of the UCS.<\/p>\n<\/div>\n<\/div>\n

          Lab Exercise 4-1<\/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 04-1<\/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 04-1<\/span> as shown above.<\/p>\n

          Step 2<\/h2>\n

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

          Step 3<\/h2>\n

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

          Step 4<\/h2>\n

          Draw a wireframe model of the object. (Figure Step 4A and 4B)<\/p>\n

          \"\"
          Figure Step 4A
          Dimensioned Solid Model<\/figcaption><\/figure>\n
          \"\"
          Figure 4B Completed Wireframe Model SE Isometric View<\/figcaption><\/figure>\n

          Step 5<\/h2>\n

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

          Step 6<\/h2>\n

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

          Step 7<\/h2>\n

          Change the current UCS to World and check the model with the key.<\/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
          \"\"
          Figure Hint 1
          Construction Steps<\/figcaption><\/figure>\n

          Lab Exercise 4-2<\/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 04-2<\/td>\n3D Layout Metric<\/td>\nMillimeters<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          Step 1<\/h2>\n

          Save and name the drawing: AutoCAD 3D Lab 04-2<\/span>, as shown above.<\/p>\n

          Step 2<\/h2>\n

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

          Step 3<\/h2>\n

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

          Step 4<\/h2>\n

          Draw a wireframe model of the object. (Figure Step 4A, 4B, and 4C)<\/p>\n

          \"\"
          Figure Step 4A
          Dimensioned Solid Model<\/figcaption><\/figure>\n
          \"\"
          Figure Step 4B Completed Wireframe Model SE Isometric View<\/figcaption><\/figure>\n
          \"\"
          Figure Step 4C
          Key Detail<\/figcaption><\/figure>\n
          AUTHOR’S COMMENTS:<\/strong> Start the first view on the Front UCS. Before you start drawing, change the location of the UCS to Front.<\/div>\n

          Step 5<\/h2>\n

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

          Step 6<\/h2>\n

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

          Step 7<\/h2>\n

          Change the current UCS to World and check the model with the key.<\/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
          \"\"
          Figure Hint 1<\/figcaption><\/figure>\n

          Lab Exercise 4-3<\/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 04-3<\/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 04-3<\/span>, as shown above.<\/p>\n

          Step 2<\/h2>\n

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

          Step 3<\/h2>\n

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

          Step 4<\/h2>\n

          Draw a wireframe model of the object. (Figure Step 4A, 4B, and 4C)<\/p>\n

          \"\"
          Figure Step 4A Dimensioned Solid Module SE Isometric View<\/figcaption><\/figure>\n
          \"\"
          Figure Step 4B
          Completed Wireframe Model SE Isometric View<\/figcaption><\/figure>\n
          \"\"
          Figure Step 4C Solid Model Rotated View<\/figcaption><\/figure>\n
          AUTHOR’S COMMENTS: <\/strong>Start the first view on the Right UCS. Before you start drawing, change the location of the UCS to Right.<\/div>\n

          Step 5<\/h2>\n

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

          Step 6<\/h2>\n

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

          Step 7<\/h2>\n

          Change the current UCS to World and check the model with the key.<\/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.
          \n<\/strong><\/div>\n

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