8: Dimensioning in Technical Drawings
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What is the first step in the technical drawing process?

  • Draw the views
  • Choose the principal (front) view (correct)
  • Verify
  • Add dimensions

    • Extension lines are used to indicate the start and endpoint of a dimension.

    True

    Name one purpose of dimensioning in engineering design.

    Manufacturing

    The process of dimensioning requires defining outside dimensions, __________ dimensions, and required manufacturing dimensions.

    <p>functional</p> Signup and view all the answers

    Match the following parts of dimensioning with their functions:

    <p>Leader line = Directs attention to a specific note Dimension line = Indicates the measure of a part Extension line = Connects dimension lines to the object Terminator = Marks the end of a dimension</p> Signup and view all the answers

    Which of the following is a primary learning objective related to dimensioning in technical drawings?

    <p>Learn how to dimension special elements, e.g., threads</p> Signup and view all the answers

    Which of the following is NOT an element of dimensioning?

    <p>Tangent Line</p> Signup and view all the answers

    Dimensioning is only important for the manufacturing process.

    <p>False</p> Signup and view all the answers

    Dimensioning is only important for mechanical parts in CAD.

    <p>False</p> Signup and view all the answers

    What is typically verified after the views are drawn in the technical drawing process?

    <p>Dimensions</p> Signup and view all the answers

    What is the significance of reading dimensions accurately in technical drawings?

    <p>It ensures that the parts are manufactured to the correct specifications.</p> Signup and view all the answers

    The learning objective that focuses on simplifying dimensions is to learn how to give and read __________.

    <p>simplifications for dimensions</p> Signup and view all the answers

    Match the following types of dimensioning with their appropriate uses:

    <p>Linear Dimensioning = Used for specifying lengths or distances Angular Dimensioning = Used for specifying angles between two elements Radial Dimensioning = Used for circles and arcs Ordinate Dimensioning = Used for defining points based on a datum</p> Signup and view all the answers

    Which week in the schedule focuses on Technical Drawing: Dimensioning?

    <p>Week 8</p> Signup and view all the answers

    Students will only learn about dimensioning for standard mechanical parts.

    <p>False</p> Signup and view all the answers

    What is one example of a special element that requires specific dimensioning techniques?

    <p>Threads</p> Signup and view all the answers

    What is one of the key steps mentioned for completing dimensioning?

    <p>Add auxiliary dimensions</p> Signup and view all the answers

    All dimensions in a design are classified as functional dimensions.

    <p>False</p> Signup and view all the answers

    What must be verified after adding auxiliary dimensions?

    <p>Verify the dimensioning</p> Signup and view all the answers

    The primary reason for adding _______ dimensions is to enhance clarity in design.

    <p>auxiliary</p> Signup and view all the answers

    Match the types of dimensions with their descriptions:

    <p>Functional Dimensions = Essential for the functioning of the part Non-Functional Dimensions = Not critical for operation but provide additional information Auxiliary Dimensions = Supportive dimensions adding clarity Manufacturing Dimensions = Guidelines for production processes</p> Signup and view all the answers

    What kind of dimensions should be added to ensure complete inspection?

    <p>Both functional and non-functional dimensions</p> Signup and view all the answers

    Functional dimensions impact how parts interact within an assembly.

    <p>True</p> Signup and view all the answers

    What type of dimensions focus on the interaction of parts, such as bolts and bearings?

    <p>Functional dimensions</p> Signup and view all the answers

    What are the three distinct angles observed in the diagram?

    <p>30°, 45°, 60°</p> Signup and view all the answers

    The angle 5° appears in the orientation of dimensional values.

    <p>True</p> Signup and view all the answers

    How many 56° angles are present in the diagram?

    <p>Nine</p> Signup and view all the answers

    The angles shown in the orientation include ___ and 60°.

    <p>30°</p> Signup and view all the answers

    Which angle does not appear in the diagram?

    <p>45°</p> Signup and view all the answers

    The diagram features angles of 30° only.

    <p>False</p> Signup and view all the answers

    What is the highest angle shown in the diagram?

    <p>60°</p> Signup and view all the answers

    Match the angle with its corresponding value:

    <p>30° = Angle A 60° = Angle B 56° = Angle C 5° = Angle D</p> Signup and view all the answers

    What is the primary purpose of dimensioning in engineering drawings?

    <p>To ensure the function, manufacturing, and inspection of a part</p> Signup and view all the answers

    CAD tools eliminate the need for validating drawings.

    <p>False</p> Signup and view all the answers

    What is one common challenge when dimensioning a drawing?

    <p>Over dimensioning or ambiguity in dimensions.</p> Signup and view all the answers

    In engineering drawings, dimensions must be placed according to certain __________.

    <p>norms</p> Signup and view all the answers

    Match the following phases of the engineering design process with their focus:

    <p>Phase 1 = Concept Development Phase 2 = System-Level Design Phase 3 = Detail Design Phase 4 = Testing &amp; Refinement Phase 5 = Production Ramp-Up</p> Signup and view all the answers

    What is the purpose of having different types of dimensions in engineering design?

    <p>To ensure accurate measurements and specifications</p> Signup and view all the answers

    Bevels and countersinks can only be at angles of 45° or 90°.

    <p>True</p> Signup and view all the answers

    What is the difference between external and internal threads in dimensioning?

    <p>External threads are on the outside of a cylindrical part, while internal threads are on the inside.</p> Signup and view all the answers

    The _____ of thread run-outs is crucial for ensuring threads function properly.

    <p>depth</p> Signup and view all the answers

    Match the following dimensions to their correct types:

    <p>Chain Dimensioning = A series of dimensions aligned end to end Parallel Dimensioning = Dimensions that are placed parallel to each other Combined Dimensioning = A mixture of chain and parallel dimensions Running Dimensioning = Dimensions laid out in a continuous manner</p> Signup and view all the answers

    Which dimensioning technique involves both aligned and offset dimensions?

    <p>Combined Dimensioning</p> Signup and view all the answers

    The major diameter is always larger than the minor diameter in threaded parts.

    <p>True</p> Signup and view all the answers

    What type of hatching is used in the connection of threaded parts?

    <p>Combined hatching or thread hatching.</p> Signup and view all the answers

    Study Notes

    Engineering Design and Material Selection - Lecture Notes

    • Course: Engineering Design and Material Selection
    • Lecture: 8 - Technical drawing: Dimensioning
    • Lecturer: Dr. Tino Stankovic and Prof. Dr. Kristina Shea

    Course Schedule

    • Week 1: Introduction and Sketching
    • Week 2: Introducing Engineering Design, Case Study: Health
    • Week 3: Technical Drawing: Projections and Cuts
    • Week 4: CAD: Introduction and Modeling Operations
    • Week 5: CAD: Features and Parametric Modeling, Case Study: Future Mobility
    • Week 6: CAD: Freeform Modeling
    • Week 7: CAD: Assemblies and Standard Mechanical Parts, Case study: Health
    • Week 8: Technical Drawing: Dimensioning, X (45 min)
    • Week 9: Sustainability in Engineering Design
    • Week 10: Materials and their Properties
    • Week 11: Manufacturing Processes with Focus on Additive Manufacturing, Case Study: Sustainable Materials
    • Week 12: Material Selection
    • Week 13: Review and Q&A, X (75 min)

    Learning Objectives

    • Understand different dimensioning types and when/where to apply them
    • Give and read technical drawing dimensions according to standards (norms)
    • Understand dimensioning simplifications
    • Dimension special elements (e.g., threads)

    3D Model of a Mechanical Ventilator

    • A 3D model image of a mechanical ventilator is provided

    Mechanical Ventilator Main Parts and Functions

    • Images showing the mechanical ventilator's main components and their functions are included

    How to add dimensions to a drawing

    • Provides examples of how to dimension a circular plate, including various dimensions and angles

    Technical Drawing Process

    • Outline of the steps in the technical drawing process:
      • Choose the principal (front) view
      • Choose other required views
      • Draw the views
      • Add dimensions
      • Verify the drawing

    Elements of Dimensioning

    • Leader line: Connects the dimension to the feature on the drawing
    • Symbol: Identifies the feature (e.g., Ø12)
    • Reference line: Guides the dimension line and is parallel to the feature itself
    • Indicator: Indicates/points to the origin/starting location of the dimension.
    • Dimension line: Shows the distance between features.
    • Terminator: Marks the end of a dimension.
    • Extension line: Extends from the feature to the dimension line

    Extension and Dimension Lines

    • Illustrations show the examples of extension and dimension lines, terminators

    Example for Simple Dimensioning

    • Includes diagrams and numerical data

    Dimensioning for...

    • Function, manufacturing, and inspection
    • A visual representation of the various stages

    Dimensioning Process

    • Detailed steps for dimensioning:
      • Define outside dimensions
      • Define functional dimensions
      • Add required manufacturing dimensions
      • Add any dimensions for inspection
      • Add auxiliary dimensions
      • Verify the dimensions

    Functional and Non-Functional Dimensions

    • Image showing functional and non-functional dimensions highlighted on a bolt and supporting components

    Rules for Dimensioning

    • Illustrations of various dimensioning rules applied to a specific component

    How many dimensions for complete dimensioning?

    • Illustrates the different views of a component with various dimensions

    Auxiliary Dimensions

    • Show dimensioning examples of a component

    First Example: Cover plate

    • Provided images and example data relating to a cover plate

    Cover plate: functional dimensions, outside dimensions, manufacturing dimensions

    Orientation of Dimensional Values

    • Provides an illustration of orientation principles for dimensioning

    Second example: motor holding plate

    • Demonstrates a second example

    Motor holding plate: outside dimensions, functional dimensions, manufacturing dimensions

    Representation of Internal Threads

    • Illustrates major and minor diagrams depicting internal threads

    Representation of External Threads

    • Provides diagrams depicting external threads, highlighting major and minor aspects

    Representation of Thread Run-Outs

    • Diagram depicting how to dimension thread runouts

    Connection of Threaded Parts - Hatching

    • Image demonstrating the relationship between external and internal threads and their depiction in a drawing

    How many threaded holes on the shown views?

    • Question about counting threaded holes on a given drawing

    Checklist for verifying dimensioning

    • Questions to verify dimensioning completeness

    Checklist for verifying technical drawings

    • Questions/checklist to verify technical drawing quality

    Drawing comparison 1 and 2

    • Compare two different drawings using example images to illustrate different approaches

    Which drawing is better?

    • Comparing two drawings and highlighting the superior drawing traits

    Case Study Mechanical Ventilator - Wrap-Up

    • Illustrates the development process of a mechanical ventilator, from concept to ramp-up

    Dimensioning - Wrap Up

    • Summarizing dimensioning principles

    Exercise 8: CAD Drafting

    • An exercise to highlight and practice creating a linear guide drawing

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    Engineering Design And Material Selection Lecture 8 - Technical Drawing PDF

    Description

    This quiz explores the essentials of dimensioning in technical drawings. It covers the importance of accurate measurement, different types of dimensioning, and their significance in engineering design. Test your knowledge on the critical components and processes involved in creating technical drawings.

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