Plan
Course Title: Manufacturing Engineering
Session Title: Computer Numerical Control (CNC) Machines Performance Objective:
After completing this lesson, students will be able to recall key concepts in the operation of
Computer Numerical Control (CNC) Machines to the teacher’s satisfaction.
Specific Objectives:
 Discuss the purpose of CNC Machines.
 Research and discuss terms used in typical CNC Machine operations.
 Discuss finished parts inspection criteria.
Preparation
TEKS Correlations:
This lesson, as published, correlates to the following TEKS. Any changes/alterations to the
activities may result in the elimination of any or all of the TEKS listed.
Manufacturing Engineering:

130.329(c)(6)(A)(B)(C)(D)(E)
…design on the computer numerical control lathe;
…produce on the computer numerical control lathe;
…design on the computer numerical control mill;
…produce on the computer numerical control mill;
…complete data sheets for plan, do, check, and act forms and projects.
Interdisciplinary Correlations:
Physics:

112.39(c)(2)(A)(B)(C)(D)
...know the definition of science and understand that it has limitations, as specified in
subsection (b)(2) of this section;
...know that scientific hypotheses are tentative and testable statements that must be
capable of being supported or not supported by observational evidence. Hypotheses of
durable explanatory power which have been tested over a wide variety of conditions are
incorporated into theories;
...know that scientific theories are based on natural and physical phenomena and are
capable of being tested by multiple independent researchers. Unlike hypotheses,
scientific theories are well-established and highly-reliable explanations, but may be
Copyright © Texas Education Agency, 2012. All rights reserved.
1 subject to change as new areas of science and new technologies are developed;
...distinguish between scientific hypotheses and scientific theories;

112.39(c)(3)(D)
...explain the impacts of the scientific contributions of a variety of historical and
contemporary scientists on scientific thought and society;
English Language Arts and Reading, English I:

110.31(b)(1)(E)
...use a dictionary, a glossary, or a thesaurus (printed or electronic) to determine or
confirm the meanings of words and phrases...

110.31(b)(12) - Reading/Media Literacy.

110.31(b)(19) - Oral and Written Conventions/Spelling.

110.31(b)(24)(A)
…listen responsively to a speaker by taking notes that summarize, synthesize, or
highlight the speaker's ideas for critical reflection and by asking questions related to the
content for clarification and elaboration;

110.31(b)(25) - Listening and Speaking/Speaking.
Copyright © Texas Education Agency, 2012. All rights reserved.
2 Occupational Correlation: (reference: O*Net – www.onetonline.org)
Computer-Controlled Machine Tool Operators, Metal and Plastic 51-4011.00
Similar Job Titles: Computer Numerical Control Machinist (CNC Machinist), Machine Operator,
Computer Numerical Control Lathe Operator (CNC Lathe Operator), Computer Numerical
Control Machine Operator (CNC Machine Operator), Computer Numerical Control Mill Operator
(CNC Mill Operator),
Tasks:
 Measure dimensions of finished work pieces to ensure conformance to specifications,
using precision measuring instruments, templates, and fixtures.
 Remove and replace dull cutting tools.
 Mount, install, align, and secure tools, attachments, fixtures, and work pieces on
machines, using hand tools and precision measuring instruments.
 Adjust machine feed and speed, change cutting tools, or adjust machine controls when
automatic programming is faulty or if machines malfunction.
 Stop machines to remove finished work pieces or to change tooling, setup, or work piece
placement, according to required machining sequences.
 Lift work pieces to machines manually or with hoists or cranes.
 Modify cutting programs to account for problems encountered during operation and save
modified programs.
 Calculate machine speed and feed ratios and the size and position of cuts.
 Insert control instructions into machine control units to start operation.
Soft Skills:
Critical Thinking; Operation Monitoring; Troubleshooting
Teacher Preparation:
Teachers should review all supporting documents such as the Computer Numerical Control
(CNC) Machine presentation and notes, Matching Terms and Definitions handout, and Parts
Inspection Worksheet. Teachers are encouraged to conduct their own research for the
lesson. Locate images and videos of typical CNC machines at work; photo examples
of drawings; and finished products used in CNC manufacturing to show students during the
presentation. Locate images of common standardized products: auto parts, plastic products,
wood products to show students.
References:
O*Net – www.onetonline.org
Instructional Aids:
1. Computer Numerical Control (CNC) Machines presentation and notes
2. Matching Terms and Definitions handout answer key
3. Parts Inspection Worksheet answer key
4. Warm-up activity (slide 3)
Copyright © Texas Education Agency, 2012. All rights reserved.
3 Materials Needed:
1. Matching Terms and Definitions handout for each student
2. Parts Inspection Worksheet for each student
3. Pen or pencil
4. Paper
Equipment Needed:
1. Computer
2. Internet access (optional)
3. Overhead projector
Learner Preparation:
Students must have basic computer skills.
Introduction
Introduction (LSI Quadrant I):
SAY: Having an understanding of CNC Machines will greatly contribute to your career
success.
ASK: Have you ever thought about how important standardized parts production is to your
everyday life?
SHOW: Images of common standardized products: auto parts, plastic products, wood products
SAY: CNC (mass produced parts) enhance our lives and can be produced efficiently at less
cost than by hand.
ASK: Have you ever talked to someone who creates hand crafted products about how much
time is required to produce each item?
SHOW: Show videos of CNC machines at work and highlight key points involving how easy it is
for a CNC machine to create hundreds of identical products.
Outline
Outline (LSI Quadrant II):
Instructors can use the presentation, slides, handouts, and note pages in
conjunction with the following outline.
MI
Outline
Notes to Instructor
I. Introduction and Start of Lesson
A. Bell Work Activity
B. Warm-up Activity
Begin Computer Numerical
Control (CNC) Machines
presentation.
Slide 1
Bell Work Activity: have
students work on the Bell
Work Activity.
Slide 2
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4 Warm-up Activity: Using the
Matching Terms and
Definitions handout, students
will pair-share and teach each
other the terms and
definitions. They may do
computer-based research to
look up the meaning.
Slide 3
II. History of Metalworking
A. Historical overview
B. Impact of industrial revolution
Discuss the growth of
metalworking and how it
impacted the growth of
Europe and America.
Slides 4-5
III. CNC Machines
A. Overview
B. Typical system layout and
related components
Discuss the purpose of CNC
machines, system layout and
components
Slides 6-7
.
IV. CNC Cutting Bed Layout
A. Side View: Z axis
B. Top View: X axis and Y axis
Explain how the X, Y and Z
axes relate to the cutting
bed. Ensure students
understand how the system
operates. Have some
background knowledge, and
challenge the students to
make some contributions to
the discussion.
Slide 8
Each slide is meant to be
discussed.
Copyright © Texas Education Agency, 2012. All rights reserved.
5 V. Parts Inspection Worksheet
A. Assign worksheet
B. Teacher will go over
worksheet in class
Verbal
Linguistic
Logical
Mathematical
Visual
Spatial
Musical
Rhythmic
Bodily
Kinesthetic
Intrapersonal
Distribute and assign the
Parts Inspection Worksheet to
the students. Teacher will go
over the answers in class for
better understanding.
Interpersonal
Naturalist
Existentialist
Application
Guided Practice (LSI Quadrant III):
Using Matching Terms and Definitions handout, students will pair-share and teach each other
the terms and definitions. They may do computer-based research to look up the meaning.
Independent Practice (LSI Quadrant III):
Students will complete Warm-up Activity, doing computer-based research to look up and match
the meaning of words on the handout, writing out definitions on a sheet of paper. Students will
complete the Parts Inspection Worksheet.
Summary
Review (LSI Quadrants I and IV):
Question: What is the primary advantage of CNC machine produced products over hand
machined products?
Answer: When CNC machines are properly set up, each machine can operate
Independently to create hundreds of identical items. It saves time and allows products
to be produced faster and reduces manual labor.
Question: How can you ensure that parts from a CNC machine are within specifications?
Answer: Compare the tolerances of parts completed on the CNC machine to
specifications on the drawings.
Question: What is necessary to become a good CNC machine operator?
Answer: A high level of understanding of system operations
Evaluation
Informal Assessment (LSI Quadrant III):
Copyright © Texas Education Agency, 2012. All rights reserved.
6 Oral question/answer. Students will complete definitions teacher has on the board from the
Matching Terms and Definitions handout. Students will complete the Parts Inspection
Worksheet and will go over it in class with the teacher.
Formal Assessment (LSI Quadrant III, IV):
No formal assessment in this lesson.
Extension
Extension/Enrichment (LSI Quadrant IV):
1. Students can work in groups to find different models of CNC machines; study them and
discuss the differences within the group.
2. Students can conduct research and identify a nearby manufacturing facility, then contact
the plant supervisor and request a tour of the facility to find out more about how CNC
machines operate and are maintained. If allowed they can take photos and conduct
interviews and create a presentation for class.
Copyright © Texas Education Agency, 2012. All rights reserved.
7 Name______________________________Date_________________Class_________
Computer Numerical Control (CNC) Machines Matching Terms and Definitions Directions: Match the terms in Section 1 with the definitions in Section 2. Section 1: A. PC / software B. Control panel C. Spindle D. Controller E. Cutting bed F. Program loading G. Program verification H. Tool assembly I. Tool load J. Tool measurement Copyright © Texas Education Agency, 2012. All rights reserved.
8 Section 2:  ____ attach the required tools to the spindle  ____ ensure the software matches the job requirement  ____ used to power up, shut down or make adjustments to the machine  ____ works with the PC and software to control the operation of the spindle  ____ used to hold and support the product being created  ____ serves as the brain of the machine. The program converts the product drawing into electronic signals for the spindle to use to create the actual part  ____ upload or open the required software for the particular task  ____ houses the rotating cutting tool used to cut and shape the part being created; (by tapping, drilling, cutting boring and shaping)  ____ make the required tool adjustments (depth, height, location, etc.) to match the job requirements  ____ collect the required spindle tools for the particular task Copyright © Texas Education Agency, 2012. All rights reserved.
9 Manufacturing Engineering
Computer Numerical Control (CNC) Machines Matching Terms and Definitions Answer Key  I. Tool load: attach the required tools to the spindle  G. Program verification: ensure the software matches the job requirement  B. Control panel: used to power up, shut down or make adjustments to the machine.  D. Controller: works with the PC and software to control the operation of the spindle  E. Cutting bed: used to hold and support the product being created  A. PC / software: serves as the brain of the machine. The program converts the product drawing into electronic signals for the spindle to use to create the actual part  F. Program loading: upload or open the required software for the particular task  C. Spindle: houses the rotating cutting tool used to cut and shape the part being created; (by tapping, drilling, cutting boring and shaping)  J. Tool measurement: make the required tool adjustments (depth, height, location, etc.) to match the job requirements  H. Tool assembly: collect the required spindle tools for the particular task Copyright © Texas Education Agency, 2012. All rights reserved.
10 Name______________________________Date_________________Class_________
Manufacturing Engineering
Computer Numerical Control (CNC) Machines Parts Inspection Worksheet Directions: Read and complete the missing information for the eight statements listed below. 1. Inspect parts at a distance of __________ in proper lighting. 2. Rotate parts __________during inspection. 3. Measure a sample of completed parts to __________ that all parts are within required __________. 4. Compare the tolerances of __________to tolerances on the drawings to ensure the tolerances __________. 5. Verify the size, speed and depth settings of all spindle tools to ensure they match the __________on the drawings for the __________. 6. Monitor all quality control information to keep track of __________. 7. Regularly measure the tolerances on ____________________throughout the production run to track tool wear or deterioration and machine variation. 8. Replace worn tools and make adjustments to machines that ____________________. Copyright © Texas Education Agency, 2012. All rights reserved.
11 Manufacturing Engineering
Computer Numerical Control (CNC) Machines Parts Inspection Worksheet Answer Key 1. Inspect parts at a distance of 18 inches in proper lighting. 2. Rotate parts 360 degrees during inspection. 3. Measure a sample of completed parts to verify that all parts are within required tolerances. 4. Compare the tolerances of completed parts to tolerances on the drawings to ensure the tolerances meet specifications. 5. Verify the size, speed and depth settings of all spindle tools to ensure they match the acceptable ranges on the drawings for the job requirements. 6. Monitor all quality control information to keep track of machine performance. 7. Regularly measure the tolerances on finished product samples throughout the production run to track tool wear or deterioration and machine variation. 8. Replace worn tools and make adjustments to machines that show performance variation. Copyright © Texas Education Agency, 2012. All rights reserved.
12