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Credit- Degree applicable
Effective Quarter: Fall 2020

I. Catalog Information


DMT 92
Applied GD&T (ASME Y14.5m); Coordinate Measuring Machines (CMM)
4 Unit(s)
 

(Formerly MCNC 72.)

Advisory: EWRT 200 and READ 200, or ESL 261, 262 and 263; MATH 210 or equivalent; experience in blueprint reading.

Lec Hrs: 36.00
Lab Hrs: 36.00
Out of Class Hrs: 72.00
Total Student Learning Hrs: 144.00

Interpretation of specifications and inspection procedures related to current ASME Y14.5 Geometric Dimensioning and Tolerancing (GD&T) standards. Applications and capabilities of precision measuring tools, including the computer-aide Coordinate Measuring Machine (CMM), used in manufacturing environments to inspect discrete complex parts. Machine and inspected part set-up for measuring form, orientation, and position callouts.


Student Learning Outcome Statements (SLO)

 

Apply geometric dimensioning and tolerancing standards to interpret drawings and inspect manufactured parts.


 

Demonstrate basic operation of the coordinate measuring machine to inspect manufactured parts.


II. Course Objectives

A.Explain ISO and ASME Y 14.5M Geometric Dimensioning and Tolerancing (GD&T).
B.Interpret various form tolerances without datums
C.Describe orientation tolerances and methods of inspecting them
D.Explain the true position tolerances and methods of inspecting them
E.Demonstrate the applications of coordinate measuring systems to inspect form, orientation and position callouts of mechanical parts

III. Essential Student Materials

 None

IV. Essential College Facilities

 Metrology lab

V. Expanded Description: Content and Form

A.Explain ISO and ASME Y 14.5M Geometric Dimensioning and Tolerancing (GD&T).
1.System rationale, advantages, limitations and relationship to function.
2.Geometric dimensioning and tolerancing characteristics and symbols.
3.Maximum and minimum material principle.
4.Datums.
5.Standard rules.
6.Distinction between profile, form, orientation, runout and location tolerances.
B.Interpret various form tolerances without datums
1.Flatness.
2.Straightness.
a.Surface elements.
b.Axis, with and without modifiers.
3.Roundness (circularity).
a.Cylinders.
b.Cones.
c.Spheres.
4.Cylindricity.
C.Describe orientation tolerances and methods of inspecting them
1.Datum definitions and applications.
2.Parallelism.
a.Surface, cylindrical size feature and axis.
b.Effect of modifiers.
3.Perpendicularity.
a.Surfaces, cylindrical size feature and axis.
b.Effect of modifiers.
4.Angularity.
a.Surface.
b.Axis.
5.Profile.
a.Surface.
b.Surface all around.
c.Coplanar surfaces.
6.Runout.
a.Circular.
b.Total.
c.Axis, diameter and face datums.
D.Explain the true position tolerances and methods of inspecting them
1.Concept, advantages and disadvantages.
2.Three plane concept of datums.
a.Specified datums.
b.Implied datums.
3.Position tolerance.
a.For holes in relationship to feature size.
b.For non-cylindrical features.
c.Or mating parts.
d.For coaxial gauges.
e.Non-cylindrical gauges.
4.Position and coordinate tolerance zone conversions.
5.Concentricity.
6.Symmetry.
E.Demonstrate the applications of coordinate measuring systems to inspect form, orientation and position callouts of mechanical parts
1.Types of coordinate measuring machines.
a.Utility grade.
b.Direct computer controlled.
c.High accuracy.
d.Sources of error.
2.Structure of the coordinate measuring machine.
a.Scales.
b.Axis.
c.Surface plate.
d.Environment.
3.Probing systems.
a.Solid probes.
b.Touch trigger.
c.Analog probes.
d.Sources of error.
4.Scanning vs point to point measurement, datum simulation and assembly.
5.Alignment.
a.Right hand rule.
b.Primary secondary and tertiary datum alignment.
6.Measuring form.
a.Flatness.
b.Straightness.
c.Circularity.
d.Cylindricity.
7.Measuring orientation.
a.Angularity.
b.Perpendicularity.
c.Parallelism.
8.Measuring location.
a.Position.
b.Concentricity.
9.Measuring profile.
10.Assembly of a measurement plan.

VI. Assignments

A.Required reading assignments from text and supplemental handouts.
B.Skill exercises to practice GD&T and CMM assignments.
C.Written project that requires comprehension and application of GD&T.

VII. Methods of Instruction

 Lecture and visual aids
Discussion of assigned reading
Quiz and examination review performed in class
Collaborative learning and small group exercises
Laboratory discussion sessions and quizzes that evaluate the proceedings weekly laboratory exercises

VIII. Methods of Evaluating Objectives

A.Midterm exam and quizzes to evaluate comprehension of terms and concepts, as well as application skills related to GD&T and CMM.
B.Accuracy and completion of skills exercises to evaluate GD&T and CMM competencies.
C.Written project demonstrating critical thinking regarding the GD&T measurement plan, as well as comprehension and application of metrology concepts.
D.Final exam evaluated by the students ability to critically analyze and apply GD&T concepts examined throughout the course

IX. Texts and Supporting References

A.Examples of Primary Texts and References
1.Madsen, David, "Geometric Dimension and Tolerancing, 9th edition". Goodheart-Wilcox, 2012
B.Examples of Supporting Texts and References
1.Dotson, Connie. "Fundamentals of Dimensional Metrology 6th edition." New York: Cengage Learning, 2015.
2.ASME. "American Society of Mechanical Engineers Dimensioning and Tolerancing Y14.5M." New York, ASME, 2009.

X. Lab Topics

A.Inspecting tolerances
B.True position tolerances
C.Orientation tolerances
D.Form tolerances
E.CMM operation
F.CMM modular fixturing