Maricopa Community Colleges  HVA186   20036-20036 
Official Course Description: MCCCD Approval: 06/17/03
HVA186 20036-20036 LEC 2 Credit(s) 2 Period(s)
Electro-Mechanical Devices
Concepts, principles, maintenance, and troubleshooting of mechanical and electro-mechanical devices. Mechanical alignment of shafts, pillow blocks, gears, and couplers on mechanical equipment. Bearings removal and installation. Installation and troubleshooting of pump seals. Vernier calipers, micrometers, tachometers. Use and operation of air flow hoods for air balancing. Belt drive systems and set up and operation of variable frequency drives. Cooling tower water treatment controls and chemical additives. Prerequisites: FAC/HVA101, FAC/HVA101LL, FAC/ELC/HVA105 and FAC/ELC/HVA105LL or equivalent, or permission of instructor.
Cross-References: FAC186
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MCCCD Official Course Competencies:
 
HVA186   20036-20036 Electro-Mechanical Devices
1. Describe the characteristics of spur, bevel, helical, and herringbone gears. (I, III)
2. Use micrometers, vernier calipers and dial indicators to make mechanical measurements. (I)
3. Relate the principle of conservation of energy to the mechanical characteristics of gear and levers. (II)
4. Set up/align a mechanical equipment. (III)
5. Replace mechanical seals related to pump seal problems. (IV)
6. Replace pulleys and drives to achieve proper speed requirements. (V)
7. Use tachometers to measure RPM. (V)
8. Manage gear problems and failures. (VI, VII)
9. Use appropriate lubricants. (VI)
10. Manage bearing failures and problems. (VII)
11. Replace bearing on shaft. (VII)
12. Monitor filter specifications to maintain proper system operation. (VIII)
13. Program variable frequency drives. (IX)
14. Measure air flow from flow hood. (X)
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MCCCD Official Course Outline:
 
HVA186   20036-20036 Electro-Mechanical Devices
    I. Selection and Specification of Components
        A. Gears
        B. Belt drives
        C. Bearings
        D. Speed reducers
        E. Lubricants
        F. Filters
        G. Measuring tools
          1. Vernier calipers
          2. Micrometers
      II. Physical Laws of Gears and Levers
          A. Newton's laws of motion
          B. Force action and reaction - linear motion
          C. Torque action and reaction - rotational motion
          D. Mechanical advantage concepts
          E. Angular velocity concepts
          F. Work and conservation of energy - gears and levers
        III. Gear Trains
            A. Alignment of shafts, pillow blocks, and bearings
            B. Gear spacing for backlash
            C. Measuring gear reduction
            D. Worm gear assembly
            E. Spur and bevel gear assembly
            F. Thrust requirements for helical gears
          IV. Pump Seals
              A. Stuffing box seals
              B. Mechanical - balanced and unbalanced
              C. Inside/Outside seals
            V. Motors Speed Control
                A. Operation of variable frequency drives
                B. Pulleys and belt selection
                C. Tahcomenters
              VI. Lubrication and Friction
                  A. Principles of lubrication
                  B. Types of friction
                  C. Friction reduction techniques
                VII. Bearings
                    A. Journal
                    B. Ball
                    C. Roller
                    D. Taper
                    E. Needle
                  VIII. Filters
                      A. Viscous impingement
                      B. Electronic
                      C. Carbon
                      D. Hepa
                    IX. Variable Frequency Drives
                        A. Programming
                        B. Operation of drives
                      X. Air Flow Hoods
                          A. Use
                          B. Operation
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