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Credit- Degree applicable
Effective Quarter: Fall 2016

I. Catalog Information

DMT 82
Machining Practices Using Conventional Machine Tools, Tool Design, Abrasive Machining
5 Unit(s)

 

Formerly: (Formerly MCNC 77.)

Requisites: Prerequisite: DMT 80 with a grade of C or better or equivalent.

Hours: Lec Hrs: 36.00
Lab Hrs: 72.00
Out of Class Hrs: 72.00
Total Student Learning Hrs: 180.00

Description: Advanced machining and abrasive machining practices using conventional machine tools and surface grinders. Introduction to fixture design including location, clamping methods and computation of fits and allowances.


Student Learning Outcome Statements (SLO)

 

• Student Learning Outcome: Analyze, construct, and inspect assigned machined projects using advanced principles of machining.


 

• Student Learning Outcome: Demonstrate safe operation of specialized machining equipment to construct advanced assemblies.


II. Course Objectives

A.Describe elements of fixture design for lathes and mills including location, clamping and alignment procedures.
B.Describe abrasive machining applications and select the proper grinding wheel abrasive, bond, and structure for wide variety of operations.
C.Calculate fits and allowances as applied to mechanical components.
D.Demonstrate advanced lathe and milling operations such as offset boring and single point threading.

III. Essential Student Materials

 Scientific calculator (Texas Instruments-TI30 recommended)

IV. Essential College Facilities

 A laboratory/classroom equipped with precision measuring tools, machines and accessories

V. Expanded Description: Content and Form

A.Describe elements of fixture design for lathes and mills including location, clamping and alignment procedures.
1.Base plate and location methods
a.Flat surface; button, pin & bar locators
b.Cylindrical surface; conical & V locators
c.Irregular surface; pin & sightline locators
d.Location from holes, pin & diamond locators
2.Clamps
a.Types and applications
b.Placement and movement
3.Pushers, jacks and support components
B.Describe abrasive machining applications and select the proper grinding wheel abrasive, bond, and structure for wide variety of operations.
1.Surface grinder, applications, set-up and operation
a.Flat, form, parallel, angular and square surfaces
b.Work holding, magnetic and non-magnetic parts
2.Cylindrical grinder, applications and characteristics
3.Centerless grinder, applications and characteristics
4.Blanchard grinder, applications and characteristics
5.Grinding wheel selection and use for grinding different materials
a.Safety
b.Abrasive types, characteristics and uses
c.Bonding agents
d.Hardness, grit size, and structure designations
e.Dressing
f.Grinding problems and appropriate wheel selection
6.Honing machine components and applications
a.Stone selection and dressing
b.Honing procedures
1.Precise hole size control
2.Localized honing
7.Lapping operations
a.Hand
b.Machine
C.Calculate fits and allowances as applied to mechanical components.
1.Types and applications
a.Running fits
b.Interference fits, expansion and shrink
2.Calculate using component tolerances
D.Demonstrate advanced lathe and milling operations such as offset boring and single point threading.
1.Lathe Operations
a.4-jaw chuck applications
1.Centering workpiece
2.Eccentric turning
b.Face plate applications
1.Clamping workpiece
2.Balancing, RPM limitations
c.Boring applications
1.Boring bar types and selection
2.Tool geometry
d.Single Point Threading
1.Tool geometry and grinding
2.Lathe set up for internal and external
2.Mill operations
a.Location of bolt hole circles
1.Calculation of rectangular coordinates
2.Calculation of chords
b.Offset boring and facing head
1.Tool geometry
2.Set up and operation
c.Mill head alignment

VI. Assignments

A.Lab projects demonstrating mastery of skills using the machines and equipment covered in this course.
B.Take home worksheets involving fit and locational calculations.
C.Reading from textbook and trade references.

VII. Methods of Instruction

 Lecture and visual aids
Discussion of assigned reading
Discussion and problem solving performed in class
Quiz and examination review performed in class
Homework and extended projects
Laboratory discussion sessions and quizzes that evaluate the proceedings weekly laboratory exercises

VIII. Methods of Evaluating Objectives

A.Completion and accuracy of take home worksheets, with emphasis on use of correct calculations and formulas
B.Evaluation and dimensional inspection of laboratory projects and exercises.
C.Three comprehensive, objective exams that require students to critically analyze and apply concepts covering lecture material and lab demonstrations throughout the course.

IX. Texts and Supporting References

A.Examples of Primary Texts and References
1.Peter Hoffman, Eric Hopewell, Brian Janes and Kent Sharp, "Precision Machining Technology" New York: Delmar, Cengage Learning, 2012
2.MCNC Staff, Manufacturing & CNC 77 Syllabus. Cupertino: De Anza College, 2012.
B.Examples of Supporting Texts and References
1.Jones, Franklin and Erik Oberg, "Machinery's Handbook 29th edition" New York: Industrial Press, 2012.

X. Lab Topics

A.Fixture building
B.Surface grinding operations
C.Advanced mill operations
D.Advanced lathe operations