Maricopa Community Colleges  DFT242   19902-20086 
Official Course Description: MCCCD Approval: 07/22/08
DFT242 19902-20086 L+L 3 Credit(s) 6 Period(s)
Printed Wiring Design I
Layout techniques for designing printed wiring boards, and related drawings. Schematic diagrams, art work, and fabrication drawings.
Prerequisites: DFT241 or equivalent or permission of Department or Division.
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MCCCD Official Course Competencies:
 
DFT242   19902-20086 Printed Wiring Design I
1. Describe the general aspects of machine design. (I)
2. Describe the five types of friction. (II)
3. Describe the properties and types of lubricants (including specialty lubricants), and identify the proper lubrication system for a specific application. (II)
4. Identify and recommend proper usage of the different types of bearings and indicate when thrust washers are needed. (III)
5. Prepare a force analysis of a project to determine bearing load and type of bearing required. (III)
6. Solve equations for torsion, torsional deflection, and combined torsion and bending of hollow and solid shafting. (IV)
7. Calculate and size flat, square, and Woodruff keys. (IV)
8. Determine the critical speed for a given shaft size. (IV)
9. Prepare a force analysis and select appropriate materials for shafting design. (IV)
10. Select and size fasteners, retaining rings, and couplings which are appropriate for a machine assembly. (V)
11. Describe specialty assembly adhesives and their application. (V)
12. Describe welding processes and the symbols for welding assembly. (V)
13. Describe the advantages and disadvantages of each type of belting: flat, round, positive-drive, and V. (VI)
14. Calculate pulley sizes and belt sizes to transfer load rating. (VI)
15. Design a chain drive, including sprockets and chains, capable of transmitting required force magnitude. (VII)
16. Identify types of hoists: differential, spur-geared, and block-and-tackle. (VII)
17. List common conveyor types and their uses. (VII)
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MCCCD Official Course Outline:
 
DFT242   19902-20086 Printed Wiring Design I
    I. Introduction
        A. General considerations
        B. Types of design
        C. Materials
        D. Degrees of freedom
        E. Design calculations
        F. Laboratory support; reproduction models; mock-ups
        G. Design stress; factor of safety
      II. Friction and lubrication
          A. Sliding friction
          B. Rolling friction
          C. Journal frictions and the friction circle
          D. Pivot friction
          E. Collar friction
          F. Lubrication
          G. Viscosity and viscosity index
          H. Lubrication systems
        III. Bearings
            A. Sliding bearings (bushings)
            B. Porous bearings
            C. Materials for sleeve bearings
            D. Heat-radiating capacity for sliding bearings
            E. Air bearings
            F. Bronze bearings
            G. Anti-friction bearings
            H. Types of ball bearings
            I. Types of roller bearings
            J. Needle bearings
            K. Lubrication in anti-friction bearings
            L. Special bearings
            M. Transmission accessories
            N. Thrust washers
            O. Wheels and casters
            P. Calculations of bearing loads
          IV. Shaft design
              A. Common shaft sizes
              B. Torsion
              C. Torsional deflection (solid shaft)
              D. Hollow vs. solid shafting
              E. Combined torsion and bending (solid shafting)
              F. Tension or compression combined with torsion
              G. Keyseats in shafts
              H. Critical speeds
              I. Flexible shafts
              J. Vertical shear in shafts
              K. Noncircular shafts
              L. Linear deflection of shafts
              M. Materials for shafts
              N. Power take-offs
            V. Fasteners, couplings, keys, retaining rings, welding and weld design
                A. Fasteners
                B. Retaining rings
                C. Couplings
                D. Keys
                E. Specialty assembly adhesives
                F. Welding and weld design
              VI. Belting
                  A. Introduction
                  B. Flat belting
                  C. Round belting
                  D. Positive-drive belting
                  E. V-belting
                VII. Chain drives
                    A. Chain drives
                    B. Hoists and conveyors
                    C. Ropes
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