Maricopa Community Colleges  ABC115   20052-20086 
Official Course Description: MCCCD Approval: 07/22/08
ABC115 20052-20086 L+L 4 Credit(s) 6 Period(s)
Basic Layout Methods
Principles of parallel line development, triangulation and radial line development for layout. Emphasis on application of these principles to fabrication of ductrun fittings and related tasks.
Prerequisites: (Registered apprentice status and ABC114) or permission of the apprenticeship coordinator.
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MCCCD Official Course Competencies:
 
ABC115   20052-20086 Basic Layout Methods
1. Define the method "parallel line development" as it applied to sheet metal fabrication and explain the principles/rules of parallel line development. (I)
2. List the layout tools and fabrication equipment necessary for sheet metal construction. (II)
3. Use the principles and procedures of parallel line development for the layout and fabrication of selected ductrun fittings and related tasks. (III)
4. Define the technique "triangulation" and decribe the principles, steps and uses of triangulation used to determine measurements for duct fittings. (IV)
5. Use the principles of triangulation in the layout and fabrication of selected ductrun fittings and related tasks. (V)
6. Describe the principles and uses of radial line development method used to develop layouts for sheet metal fittings. (VI)
7. Use the radial line development method for the layout and fabrication of selected sheet metal fittings and related tasks. (VII)
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MCCCD Official Course Outline:
 
ABC115   20052-20086 Basic Layout Methods
    I. Parallel line development
        A. Difinition
        B. Principles/rules
          1. Plan and elevation view
          2. Pattern
          3. Stretchout line
          4. Measuring lines
          5. Lines for intersection
          6. Pattern development
      II. Tools and fabrication equipment
          A. Tools
            1. Scratch awls
            2. Pencils
            3. Flat steel square
            4. Combination square
            5. Other
          B. Fabrication equipment
            1. Pliers
            2. Hand seamer
            3. C-clamps
            4. Setting or riveting hammer
            5. Other
        III. Parallel line development - layout and fabrication
            A. Rectangular roof flange
              1. Tools/materials
              2. Procedures
            B. Style "K" gutter section miter
              1. Tools/materials
              2. Procedures
            C. Tool book
              1. Tools/materials
              2. Procedures
            D. A-type ventilator
              1. Tools/materials
              2. Procedures
            E. Other
          IV. Triangulation
              A. Principles
                1. Dividing the surface
                2. True length of slant sides
                3. Drawing the triangles
              B. Steps
                1. Constructing the plan/elevation
                2. Developing the true length
                3. Layout of pattern
                4. Fabrication
              C. Uses
                1. Fittings with unparallel sides
                2. Examples
            V. Layout and fabrication - triangulation
                A. Round joint - equal taper
                  1. Tools/materials
                  2. Procedures
                B. Transition - rectangular to irregular shape
                  1. Tools/materials
                  2. Procedures
                C. Transition elbows - 90 degree
                  1. Tools/materials
                  2. Procedures
                D. Transition Y branch - 90 degree
                  1. Tools/materials
                  2. Procedures
                E. Other
              VI. Radial line development method
                  A. Specifications
                    1. True length of the elements
                    2. Circumference or the perimeter of the base
                  B. Use
                    1. Round tapering fittings
                    2. Other
                VII. Layout and fabrication - radial line development method
                    A. Rectangular weather cap
                      1. Tools/materials
                      2. Procedures
                    B. Symmetrical tapered duct
                      1. Tools/materials
                      2. Procedure
                    C. Roof slope stack flange
                      1. Tools/materials
                      2. Procedures
                    D. Cone-shaped exhaust weather cap
                      1. Tools/materials
                      2. Procedures
                    E. Other
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