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4.4: Module 20 Sectioning Solid Models

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    19966
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    Module 20 Sectioning Solid Models

    Learning Outcomes

    When you have completed this module, you will be able to:

    1. Apply the SLICE command to cut solid models into two individual solids.
    2. Apply the SECTION command to create 2D cross sectional regions through solid models.

    Sectioning

    The SLICE and SECTION commands are used to create cross sections from solid models. They can be very useful commands and save you drawing time.

    The SLICE command, see Figure 20-1A and 20-1B, cuts a solid model into two individual solids.

    20-1A.jpg
    Figure 20-1A
    Before Slice
    20-1B.jpg
    Figure 20-1B
    After Slice

    The SECTION command, see Figure 20-2, creates a two dimensional region along a selected cutting plane. The region can then be relocated to produce a cross section view in 2D and used as a detail drawing. See Figure 20-3 and 20-4.

    20-2.jpg
    Figure 20-2
    Section
    20-3.jpg
    Figure 20-3 Removed Region Shaded
    20-4.jpg
    Figure Step 20-4 Completed 2D Cross Section View

    AutoCAD Command: SLICE

    The SLICE command is used to cut a solid into two individual solids.

    Shortcut: none

    slice-pulldown.jpg
    Modify Pull-down
    slice.jpg
    Home Ribbon

    AutoCAD Command: SECTION

    The SECTION command is used to create a two- dimensional region along a specified plane in a solid object.

    Shortcut: SECsection.jpg

    AUTHOR’S COMMENTS: Type this command on the command line. It is not included in any standard AutoCAD menu.

    WORK ALONG: Sectioning Solid Models

    Step 1

    Using the NEW command, start a new drawing using template: 3D Layout English.

    Step 2

    Save and name the drawing: AutoCAD 3D Workalong 20-1.

    Step 3

    Using the figures as a reference, draw the closed plines on layer: Pline. (Figure Step 3)

    Fig-Step-3-3.jpg
    Figure Step 3

    Step 4

    Draw the solid model on layer: Solid 7. (Figure Step 4)

    Fig-Step-4-1-1.jpg
    Figure Step 4

    Step 5

    Turn layer: Pline off. Set the current UCS set to World and make a copy of the solid model 12 inches along the X axis. (Figure Step 5)

    Fig-Step-5-4.jpg
    Figure Step 5

    Step 6

    Set the current visual style to 2D Wireframe. On the original solid model, enter the SLICE command, as shown below, to slice it into two parts. (Figure Step 6A and 6B)

    Command: SLICE

    Select objects: 1 found

    (Select the solid model.)

    Select objects:

    (Press Enter.)

    Specify first point on slicing plane by [Object/Zaxis/View/XY/YZ/ZX/3points] <3points>: (mid) P1

    Specify second point on plane: (mid) P2

    Specify third point on plane: (mid) P3

    (Ensure you snap to the midpoint of each edge. If you drew an imaginary line from P1 to P2 to P3 and back to P1, it would form a cutting plane. You will have to orbit the model to do this.)

    Specify a point on desired side of the plane or [keep Both sides]: B

    (Enter B to retain both sides of the slice.)

    Command:

    Fig-Step-6A-1-1.jpg
    Figure Step 6A
    Fig-Step-6B-1-1.jpg
    Figure Step 6B

    Step 7

    Change the current visual style to Realistic. (Figure Step 7)

    Fig-Step-7-5.jpg
    Figure Step 7

    Step 8

    Using the MOVE command, move the right half away from the left half. The distance you move it is not important. (Figure Step 8)

    Fig-Step-8-7.jpg
    Figure Step 8

    Step 9

    Your model should now appear similar to the figure. (Figure Step 9)

    Fig-Step-9-5.jpg
    Figure Step 9

    Step 10

    Set the current visual style to 2D Wireframe and set layer: Hatch as the current layer. Using the copied solid, enter the SECTION command, as shown below, to create a cross section. (Figure Step 10A and 10B)

    Command: SECTION

    Select objects: 1 found

    (Select the solid.)

    Select objects:

    Specify first point on Section plane by

    [Obj/Zaxis/View/XY/YZ/ZX/3points] <3points>: (mid) P4

    Specify second point on plane: (mid) P5

    Specify third point on plane: (mid) P6

    Command:

    Fig-Step-10A-1-1.jpg
    Figure Step 10A
    Fig-Step-10B-1-1.jpg
    Figure Step 10B
    AUTHOR’S COMMENTS: You will have to orbit the model a bit to select the correct lines.
    AUTHOR’S COMMENTS: The SECTION command creates a 2D region.

    Step 11

    Using the MOVE command move the region, that you just created, outside of the solid. The distance you move it is not important. (Figure Step 11)

    Fig-Step-11-1-1.jpg
    Figure Step 11

    Step 12

    Explode the region to convert it to lines. On layer: Hatch, add the lines to complete the cross section view as shown the figure. (Figure Step 12)

    Fig-Step-12-2-1.jpg
    Figure Step 12

    Step 13

    Set the current UCS to Front, the visual style to 2D Wireframe and set layer: Hatch as the current layer. Using the HATCH command, insert the hatch pattern ANS131. (Figure Step 13)

    Fig-Step-13-2-1.jpg
    Figure Step 13
    AUTHOR’S COMMENTS: Since HATCH is a 2D command, you must have the UCS located on the Front and the visual style set to 2D Wireframe.

    Step 14

    Your drawing should now appear similar to the figure. (Figure Step 14)

    Fig-Step-14-2-1.jpg
    Figure Step 14

    Step 15

    Move the original solid back together using osnap to locate it exactly. Use the UNION command to join the two halves into one solid model. Using the Properties window, check to ensure that you only have one solid object. (Figure Step 15)

    Fig-Step-15-4.jpg
    Figure Step 15

    Step 16

    Set the current UCS to Right and the visual style to 2D Wireframe. (Figure Step 16)

    Fig-Step-16-1-1.jpg
    Figure Step 16

    Step 17

    Enter the SLICE command, as shown below, to cut the solid through the centre of the hole on the XY plane. (Figure Step 17)

    Command: SLICE

    Select objects: 1 found

    (Select the solid.)

    Select objects: Specify first point on slicing plane by

    [Object/Zaxis/View/XY/YZ/ZX/3points] <3points>: XY

    (The XY plane is selected to be the cutting plane. All that is required now is a point and the slice will occur. It will then slice at this point parallel to the XY plane.)

    Specify a point on the XY-plane <0,0,0>: (cen) of P7

    (The centre of the circle is the point selected. The solid will be sliced through centre of the circle, parallel to XY plane.)

    Specify a point on desired side of the plane or [keep Both sides]: P8

    (Only the left side is kept.)

    Command:

    Fig-Step-17-2.jpg
    Figure Step 17

    Step 18

    Set the current UCS to World and the current visual style to Realistic. (Figure Step 18)

    Fig-Step-18-1-1.jpg
    Figure Step 18

    Step 19

    Save and close the drawing.

    Key Principles

    Key Principles in Module 20

    1. The SLICE command cuts a solid model into two individual solids.
    2. The SECTION command creates a two dimensional region along a selected cutting plane. The region can then be relocated to produce a cross section view in 2D and used as a detail drawing.

    Lab Exercise 20-1

    Time allowed: 60 minutes.

    Drawing Name Template Units
    AutoCAD 3D Lab 20-1 3D Layout Metric Millimeters

    Step 1

    Draw the closed plines on layer: Pline.

    Step 2

    On layer: Solid 3, draw a solid model of the object shown in the figures. (Figure Step 2A and 2B)

    20-1-2A.jpg
    Figure Step 2A
    Dimensioned Multiview Drawing
    20-1-2B.jpg
    Figure Step 2B Completed Solid Model SE Isometric View

    Step 3

    Set the Insertion Units, change the current UCS to World and check the model with the key.

    Step 4

    On layer: Hatch, using the SECTION command, create a region at the cutting plane A-A. Crosshatch it with ANSI31. (Figure Step 4)

    20-1-Step-4.jpg
    Figure Step 4

    Step 5

    Set the current UCS to World, make a copy of the solid model 180 millimeters apart in the X direction. Do not copy the region with the solid.

    Step 6

    Slice the model into two solids at cutting plane B-B. Move the two solids 30 millimeters apart. (Figure Step 6)

    20-1-Sep-6.jpg
    Figure Step 6

    Step 7

    Save and close the drawing.

    Lab Exercise 20-2

    Time allowed: 60 minutes.

    Drawing Name Template Units
    AutoCAD 3D Lab 20-2 3D Layout Metric Millimeters

    Step 1

    Draw the closed plines on layer: Pline.

    Step 2

    On layer: Solid 2, draw a solid model of the object shown in the figures. (Figure Step 2A and 2B)

    20-2-2A.jpg
    Figure Step 2A
    Completed Solid Model
    20-2-2B.jpg
    Figure Step 2B
    Dimensioned Multiview Drawing

    Step 3

    Set the Insertion Units, change the current UCS to World and check the model with the key.

    Step 4

    On layer: Hatch, create a 2D region section at the cutting plane B-B. Move the region away from the model and hatch it with ANS131. (Figure Step 4)

    20-2-Step-4.jpg
    Figure Step 4

    Step 5

    Set the current UCS to World and make a copy of the solid model 400 millimeters from centre to centre in the X direction.

    Step 6

    Slice the model into two solids at cutting plane A-A. Keep only the back half of the slice. (Figure Step 6)

    20-2-Step-6.jpg
    Figure Step 6

    Step 7

    Save and close the drawing.

    CONSTRUCTION HINTS: Do your best to complete the lab exercise drawing without using the following hint(s). If you get stuck and can’t complete it on your own, use the following hint(s) to help you.

    Hint 1

    Hint-Step-1.jpg
    Step 1
    Hint-Step-2.jpg
    Step 2
    Hint-Step-3.jpg
    Step 3
    Hint-Step-4.jpg
    Step 4
    Hint-Step-5.jpg
    Step 5

    This page titled 4.4: Module 20 Sectioning Solid Models is shared under a CC BY license and was authored, remixed, and/or curated by Wally Baumback (BC Campus) .

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