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Laboratory Activities for a Dimensional Metrology Class


Laboratory Activities for a Dimensional Metrology Class Joseph P. Fuehne Purdue University Mechanical Engineering Technology Columbus, Indiana – PowerPoint PPT presentation

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Title: Laboratory Activities for a Dimensional Metrology Class

Laboratory Activities for a Dimensional
Metrology Class
  • Joseph P. Fuehne
  • Purdue University
  • Mechanical Engineering Technology
  • Columbus, Indiana

  • Learning Outcomes
  • Who is PCOT in Columbus?
  • Details including objectives of 3 new
    metrology-related classes
  • Specific lab activities
  • Integration into the MET curriculum

  • Purdue University College of Technology
  • Statewide system
  • 10 locations throughout Indiana
  • Direct administrative link to West Lafayette
  • Not a regional campus
  • Work together with host campus to deliver program
  • Host campus provides instruction for general
    education classes

  • Purdue COT in Columbus
  • Four degree programs
  • MET Mechanical Engineering Technology
  • OLS Organizational Leadership Supervision
  • IT Industrial Technology
  • CNIT Computer Information Technology
  • Commuter Campus
  • Low cost alternative to main campus
  • Still awarding Purdue diplomas

  • Mechanical engineering technology
  • BSMET at locations is equivalent to BSMET at the
    main campus
  • Not true at regional campus although very similar
  • Hands-on program
  • Applied Engineering
  • Better preparation for manufacturing-related
  • No real metrology effort on the main campus
  • This effort in Columbus leads COTs metrology

  • Metrology Rationale
  • Critical tool in manufacturing
  • Underappreciated in higher education
  • Most engineering or engineering technology
    programs ignore metrology and closely-related
  • Only a handful of higher education institutions
    really address metrology in curricula

  • Metrology Lab Collaboration
  • A community effort
  • Cummins, Inc
  • Community Education Coalition
  • Environmentally-controlled lab
  • Donated equipment
  • Starrett CMM
  • Optical measurement systems
  • Mass and length standards
  • Mass balances
  • Force measurement system
  • Super micrometer
  • Hand tools

  • Engineering Technology vs Engineering
  • Metrology is a better fit in ET programs
  • Practical, hands-on program focused on design and
    production processes manufacturing!
  • ET is ideal for integrating measurement devices,
    techniques, analysis and plan development

  • Integrated curricula vs Skill Attainment
  • Integrate metrology as a tool to improve design
    and production process
  • Curriculum committees
  • Not necessarily interested in Introduction to
    CMM class
  • At least, not at upper division level
  • Easier to gain approval for a class that
    addresses overall big picture of design and
    production processes rather than a skill
    attainment class

Table 1. Description and Objectives of
Dimensional Metrology Class
Measurement Systems are vital to the manufacturing enterprise and analyzing these systems for their effectiveness is critical to verifying those measurements. Manufacturing companies may supply parts to another enterprise or accept parts from suppliers to make their products. Confirming measurements of those parts and the systems used to make them are critical to accepting and rejecting supplier parts. This class will investigate measurement systems and how to assess them through a combination of classroom and laboratory work and includes using hand tools, video measurement systems and coordinate measurement machines to measure parts and assess their effectiveness.
Course Objectives
Upon successful completion of this course, the student will be able to
Define metrology, traceability and explain the role of metrology in national and international trade.
Define the terms precision, accuracy, and reliability.
Convert dimension units between English and metric systems.
Demonstrate using graduated scales within the recognized limitations.
Understand the relationship between scale divisions and discrimination.
List the primary sources of error in graduated-scale instruments.
Correctly measure a part using a vernier instrument.
Correctly measure a part using a micrometer and a super-micrometer.
Describe how Abbes law contributes to micrometer measurement.
Describe the mathematical basis for gage block series.
Demonstrate how to properly wring blocks together.
Combine gage blocks to any desired dimension.
Describe the difference between direct measurement and comparison measurement.
Describe how pneumatic metrology works.
Demonstrate measurement using a pneumatic metrology instrument.
Apply circle and trigonometric functions with sine bars and plates to angular measurements.
Describe and use optical systems for measurement.
Describe and demonstrate measurements of screw threads.
Describe and demonstrate measurements of gears.
Table 2. Instructions on how to prepare the Executive Summary lab report.
Introduction/Objectives/Procedures Introduce the lab in complete sentences (past tense), state the objectives/purpose of the lab, and briefly describe the procedure.
Results Describe in complete sentences the MAJOR results of the lab (past tense), NOT individual results for every measurement. Include significant numerical values where appropriate. Refer to supporting tables and/or graphs that are included as attachments. Keep your statements short and to the point!
Conclusions Describe in complete sentences any conclusions (or judgments) you can make FROM the results (usually present tense). Conclusions are statements of observed trends, differences between samples, levels of performance, or comparisons to expected results (i.e., what was actually learned during the experiment and analysis). Conclusions MUST be logically derived from the results. Conclusions may be related to (but not limited to) the objectives of the experiment and the discussion questions you answered. A discussion of experimental error may also be appropriate to help explain one or more conclusions. Again, keep your statements short!
  • Lab 1 Basic Measuring Tools
  • Tape measure
  • Ruler
  • Digital caliper
  • Perform measurements leading to computation of
    surface area and volume of parts

  • Lab 2 Micrometer Calibration
  • Each student has their own micrometer to
  • Gage blocks
  • Same procedure and documentation as used at
    Cummins, Inc.
  • Lab 3 Unit Conversion Worksheet

  • Lab 4 Gage RR Study
  • Inside and outside diameters of PVC pipe coupling
  • MiniTab
  • Utilizing 3 operators with 9 different parts for
    each group

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  • Lab 5 Determining Spring Constants
  • Three different approaches to measuring spring
  • Beam balance system
  • Force Measurement system
  • Weights hanging directly from springs
  • Springs purchased at a local farm-supply store

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  • Lab 6 Determining Roundness using Dial
  • Three Cylinders machined at varying values of
  • Gage Blocks used to set dial indicator
  • Students encouraged to consider best way to
    display test data

Figure 6. Graphed data for circularity of one of
the cylinders.
  • Lab 7 - Measuring Angles
  • Use SmartScope to determine angles of 10
    different PVC angled fittings
  • Measure all 6 angles on bolts using digital
  • Measured angled end of supplied part using sine
    bar and gage blocks

Figure 7. Measured vs Nominal Angle for 10 PVC
angled fittings.
  • Lab 8 Measuring Threads using 3-wire Method

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Lab 9 Thread Details with Optical Tools
  • Summary and conclusions
  • Dimensional Metrology class required of
    industrial partners apprenticeship program
  • Technical selective for BSMET students
  • Hands-on, metrology lab activities with an
    engineering/design goal
  • Not just measuring for the hell of it