Maricopa Community Colleges  ABC208   19984-20046 
Official Course Description: MCCCD Approval: 03/24/98
ABC208 19984-20046 L+L 4 Credit(s) 6 Period(s)
Triangulation
Principles of triangulation. Pattern layout. Fabrication of selected ductrun fittings and related tasks. Prerequisites: (Indentured status with Associated Builders and Contractors, Inc. and ABC115), or permission of the apprenticeship coordinator.
Cross-References: IMC208
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MCCCD Official Course Competencies:
 
ABC208   19984-20046 Triangulation
1. Describe the principles of triangulation used to determine measurements for ductrun fittings. (I, II)
2. Use the principles of triangulation for laying out selected ductrun fittings. (III)
3. Demonstrate skill in the development, layout and fabrication of selected ductrun fittings, including, but not limited to, reducer duct, double offset transition, 90 degree Y-branch, and rectangular-to-round elbow. (IV)
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MCCCD Official Course Outline:
 
ABC208   19984-20046 Triangulation
    I. Principles of Triangulation
        A. Divide surface of fitting into triangles
        B. Find true length of slant sides
        C. Draw triangles one at a time
      II. Major Steps in Triangulation
          A. Construct plan and elevation views
          B. Develop true lengths
          C. Lay out pattern
        III. Sheet Metal Application - Layout
            A. Choose layout method
            B. Develop pattern
          IV. Layout, Cut and Form Projects
              A. Tools and materials
              B. Procedure - cutting and forming
                1. Reducer duct
                2. Square-to-round - two-way offset
                3. Double offset transition
                4. Y-branch rectangular transition
                5. Center transition - 90-degree elbow
                6. 90-degree Y-branch
                7. Rectangular-to-round elbow
                8. Y-branch round-to-round
                9. Bull nose tee
                10. Other
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