Official Course Description: MCCCD Approval: 10/28/03
HVA185 20006-20046	L+L	4 Credit(s)	6 Period(s)
Electro-Mechanical Devices
Concepts, principles, maintenance, and troubleshooting of mechanical and electro-mechanical devices; mechanical alignment of shafts, pillowblocks, gears, and couplers on mechanical breadboard; transmission devices including lead screws, linkages, worm and worm wheels, gear trains, speed reducers, chain drives, and belt drives; principles of lubrication; operation of direct current (DC), alternating current (AC), and stepping motors; application of tachometers, stepping motors, linear actuators, relays, solenoids, switches, contactors, starters, and fuses; selection and specification of components from manufacturer's catalogs. Prerequisites: ELE101, or ELT101, or GTC108, or equivalent, or permission of instructor. Corequisites: ELE100 or ELT100 suggested but not required.
Cross-References: FAC185, GTC185

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MCCCD Official Course Competencies:
HVA185   20006-20046	Electro-Mechanical Devices

1.	Describe the characteristics of spur, bevel, helical, and herringbone gears. (I, III)
2.	Relate the principle of conservation of energy to the mechanical characteristics of gear and levers. (II)
3.	Identify and specify pins, springs, machine screws, and retaining rings. (I)
4.	Set up and align a mechanical breadboard. (III)
5.	Differentiate between one-step and two-step drive of stepping motors and linear actuators. (V)
6.	Comprehend the electrical and mechanical specifications of relays and solenoids. (II)
7.	Explain mechanical advantage and angular velocity characters of single, double, and triple lead worms and worm wheels. (III)
8.	Identify and use appropriate lubricants. (VIII)
9.	Explain the torque-speed curve of stepping motors. (V)
10.	Use micrometers, vernier calipers and dial indicators to make mechanical measurements. (III)
11.	Use tachometers to measure RPM. (V)
12.	Demonstrate proper care, use, and maintenance of hand tools. (III, IV, V)
13.	List the parts of a four-bar link. (IV)
14.	Identify the parts in a chain drive. (VII)

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MCCCD Official Course Outline:
HVA185   20006-20046	Electro-Mechanical Devices

I. Selection and Specification of Components A. Gears B. Belt drives C. Chain drives D. Speed reducers E. Fasteners F. Stepper motors G. Solenoids H. Relays 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, pillowblocks, and bearings B. Gear spacing for backlash C. Measuring gear reduction D. Worm and worm wheel assembly E. Spur and bevel gear assembly F. Hand and thrust for helical gears IV. Linkage A. Basic pivot assemblies B. Four-bar linkage C. Slider crank D. Quick return V. Stepping Motors and Linear Actuators A. Principles of operation B. Driving schemes C. Speed and torque improvement VI. Syncro Systems A. Transmitter characteristics B. Receiver characteristics C. Methods of zeroing VII. Transmission Devices A. Chain and sprocket drives B. Belt and pulley drives C. Speed reducers D. Universal joints VIII. Lubrication and Friction A. Principles of lubrication B. Types of friction C. Friction reduction techniques

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