8: Dimensioning in Technical Drawings
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Questions and Answers

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 (A)

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 (B)</p> Signup and view all the answers

Which of the following is NOT an element of dimensioning?

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

Dimensioning is only important for the manufacturing process.

<p>False (B)</p> Signup and view all the answers

Dimensioning is only important for mechanical parts in CAD.

<p>False (B)</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 (D)</p> Signup and view all the answers

Students will only learn about dimensioning for standard mechanical parts.

<p>False (B)</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 (D)</p> Signup and view all the answers

All dimensions in a design are classified as functional dimensions.

<p>False (B)</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 (A)</p> Signup and view all the answers

Functional dimensions impact how parts interact within an assembly.

<p>True (A)</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° (D)</p> Signup and view all the answers

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

<p>True (A)</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° (A)</p> Signup and view all the answers

The diagram features angles of 30° only.

<p>False (B)</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 (D)</p> Signup and view all the answers

CAD tools eliminate the need for validating drawings.

<p>False (B)</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 (D)</p> Signup and view all the answers

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

<p>True (A)</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 (C)</p> Signup and view all the answers

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

<p>True (A)</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

Flashcards

Dimensioning in technical drawings

Giving dimensions to objects in technical drawings following established norms and standards.

Types of Dimensioning

Different methods for representing dimensions in technical drawings.

Technical drawing norms

Established rules and standards for creating technical drawings.

Simplified dimensions

Methods to simplify the representation of dimensions in technical drawings.

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Dimensioning special elements

Methods for representing dimensions of specific components, such as threads.

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Technical Drawing

A detailed graphical representation of an object or system.

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CAD (Computer-Aided Design)

Software for creating and modifying technical drawings digitally.

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Mechanical Ventilator

A device used to assist breathing in patients who cannot breathe on their own.

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Dimensioning

Adding measurements to a technical drawing to define the size and location of features.

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Dimensioning purposes

Dimensioning is used for functions, manufacturing, and inspections of a design. Different dimensions are needed for each purpose.

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Technical Drawing steps 1-4

  1. Choose a front view; 2. Choose other needed views; 3. Draw the views; 4. Add measurements (dimensions).
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Dimension elements

A technical drawing uses leader lines, extension lines, symbols (like Ø12), dimensional values, reference lines, indicators, dimension lines, and terminators.

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Extension and Dimension Lines

Extension lines extend from the object to the appropriate part of the drawing; dimension lines show the size of the dimension.

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Outside dimensions

Dimensions used to define the overall size of an object.

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Functional dimensions

Dimensions vital to how something operates or works.

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Manufacturing dimensions

Dimensions required for producing or creating an object.

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Auxiliary Dimensions

Dimensions added to a drawing that are not essential for the function of the part but help in manufacturing or inspection.

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Dimensioning Rules

Established standards and guidelines for placing and representing dimensions on technical drawings.

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Complete Dimensioning?

Ensuring that all necessary dimensions are included on a drawing.

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Cover plate: Functional Dimensions

Dimensions defining the interaction of the cover plate with the bolt and bearing.

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Cover plate: Outside Dimensions

Dimensions outlining the overall shape and size of the cover plate.

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Drawing Norms

Established rules defining how dimensions are placed on drawings.

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Complete Geometric Definition

A drawing must clearly and unambiguously define the shape and size of the part.

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Drawing Validation

You must assess your drawing to ensure the dimensioning is complete and not over-dimensioned.

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CAD Tools & Validation

CAD tools help create drawings, but you are still responsible for validating the accuracy and completeness of the design.

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Bevel Dimensioning

Representing the angle of a beveled surface in a technical drawing. Bevels are usually 45° or 90°.

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Countersink Dimensioning

Representing the conical depression in a hole for countersinking a screw or bolt.

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Chain Dimensioning

A dimensioning method where dimensions are arranged in a chain-like sequence, starting from a reference point.

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Parallel Dimensioning

A dimensioning method where dimensions are arranged parallel to each other, independent of a reference point.

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Combined Dimensioning

A combination of chain and parallel dimensioning, where dimensions are arranged both in chains and parallel to each other.

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Internal Thread Representation

Illustrating the dimensions of an internal thread in a technical drawing.

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External Thread Representation

Illustrating the dimensions of an external thread in a technical drawing.

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Thread Run-out

The gradual transition from a threaded section to a smooth surface in a technical drawing.

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Orientation of Dimensional Values

The way dimensions are positioned and displayed in a technical drawing, including their angles and placement relative to the object.

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Extension Line

A line that extends from a feature to indicate the beginning or end of a dimension, ending with a small arrowhead.

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Dimension Arrows

Arrowheads placed at the ends of dimension lines, indicating the direction of the measurement.

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56

A specific dimension value, representing a length or size in the drawing, possibly in a unit of measurement.

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30°

An angle of 30 degrees, indicating the orientation of a dimension or feature in a technical drawing.

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60°

An angle of 60 degrees, indicating the orientation of a dimension or feature in a technical drawing.

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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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Related Documents

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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