MCCCD Program Description

Electro-Mechanical Devices

Course: GTC185

First Term: 2006 Summer I

Lec + Lab 4 Credit(s) 6 Period(s) 5.4 Load
Subject Type: Occupational
Load Formula: S

Description: Concepts, principles, maintenance, and troubleshooting of mechanical and electro-mechanical devices; mechanical alignment of shafts, pillow blocks, 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 dc(direct current), ac(alternating current), 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

MCCCD Official Course Competencies
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)
MCCCD Official Course Competencies must be coordinated with the content outline so that each major point in the outline serves one or more competencies. MCCCD faculty retains authority in determining the pedagogical approach, methodology, content sequencing, and assessment metrics for student work. Please see individual course syllabi for additional information, including specific course requirements.

MCCCD Official Course Outline
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

MCCCD Governing Board Approval Date: 2/28/2006

All information published is subject to change without notice. Every effort has been made to ensure the accuracy of information presented, but based on the dynamic nature of the curricular process, course and program information is subject to change in order to reflect the most current information available.