Maricopa Community Colleges  ABC274   20052-20086 
Official Course Description: MCCCD Approval: 07/22/08
ABC274 20052-20086 L+L 3 Credit(s) 5 Period(s)
Sheet Metal Fabrication IV
Parallel line development, radial line development and triangulation methods for sheet metal layout. Includes fabrication of sheet metal fittings using each method. Safety stressed.
Prerequisites: (Registered apprentice status, ABC115 and ABC208) or permission of the apprenticeship coordinator.
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MCCCD Official Course Competencies:
 
ABC274   20052-20086 Sheet Metal Fabrication IV
1. Summarize the three development methods for sheet metal layout. (I)
2. Outline the sequence and major steps involved in the three development methods of sheet metal layout. (II, III, IV)
3. Lay out sheet metal patterns using parallel line development, radial line development and triangulation. (II, III, IV)
4. Explain safe cutting and forming procedures for sheet metal fabrication. (V)
5. Demonstrate skill in the layout and safe fabrication of selected sheet metal fittings by using the most suitable development method. (VI)
6. Use safe short cut methods of fabrication for efficient use of time. (VI)
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MCCCD Official Course Outline:
 
ABC274   20052-20086 Sheet Metal Fabrication IV
    I. Layout Review - Methods
        A. Parallel line development
        B. Radial line development
        C. Triangulation
      II. Parallel Line Development
          A. Principles of application
          B. Sequence
            1. Plan development
            2. Measure lines on elevation
            3. Stretchout pattern
            4. Measure lines to pattern
            5. Transfer lengths
            6. Connect points
            7. Allowances
        III. Radial Line Development
            A. Principles of application
            B. Pattern development
              1. True length of elements
              2. Circumference or perimeter of base
            C. Sequence
              1. Elevation
              2. Plan view
              3. Stretchout arc
              4. Transfer true lengths of elements
          IV. Triangulation
              A. Principles of application
              B. Sequence
                1. Calculate surface triangles
                2. Locate true lengths
                3. Construct plan view
                4. Construct elevation view
                5. Develop true lengths
                6. Lay out pattern
            V. Cutting and Forming
                A. Material
                B. Tools
                C. Procedures
                D. Safety
              VI. Layout and Fabrication - Selected Fittings
                  A. 90 degree tee
                  B. Rectangular ventilator cap
                  C. Double offset
                  D. Triangles
                  E. Gored elbow
                  F. Square-to-round two-way offset
                  G. Tapered offset duct
                  H. Transition offset elbow
                  I. Round duct intersecting taper
                  J. Hexagon-to-round two-way duct
                  K. Off-center tapered duct
                  L. 90-degree tapered elbow
                  M. 90-degree change elbow
                  N. Round tapering tee
                  O. Round tapering roof jack
                  P. Safety
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