Example of normal diametral pitch specified in the gear data block on an imperial engineering drawing for a spur gear.

Engineering Drawings for Spur and Helical Gears

The THORS course, Engineering Drawings for Spur and Helical Gears, teaches the fundamental concepts needed to read and interpret a gear drawing. Ready to take the next step? Explore the course details and see everything we’ve packed into this program!

Learning Hours: 2.5

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Course Description

The THORS course, Engineering Drawings for Spur and Helical Gears, teaches the fundamental concepts needed to read and interpret a gear drawing. Commonly used terms, such as those found in a gear data block, associated with gear features, and in notes, are explained to enhance the understanding of drawing requirements to manufacture mating gear parts.

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Who will benefit from this Engineering Drawings for Spur and Helical Gears course?

Manufacturing, quality, engineering, and purchasing functions in any organization that manufactures a gear component to an engineering drawing or print.

Course Classification

This manufacturing course by THORS eLearning Solutions covers application of the included topics.

*THORS uses the Bloom’s Taxonomy Methodology for our course development.

Certificate Awarded for Engineering Drawings for Spur and Helical Gears

Example of certificate awarded upon successful completion of the course.

*upon successful completion

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Learning Objectives

  1. Identify the distinct characteristics that are included on a spur or helical gear drawing.
  2. Recognize a gear data block and the different elements contained within it.
  3. Recognize and understand the importance of various feature attributes that may appear on spur and helical gear drawings, as well as the associated dimensioning and symbols used.
  4. Understand the different types of notes that may be found on drawings for spur and helical gears.
Example of a gear data block on an engineering drawing for a helical gear.
Engineering Drawings for Spur and Helical Gears

Table of Contents

  1. Distinct Characteristics
    1. Gear Data Block
    2. Gear Data Information
      1. Basic Gear Data
      2. Calculated Gear Data
      3. Proprietary Gear Data
    3. Gear Data Geometry
      1. Number of Teeth
      2. Normal Diametral Pitch
      3. Normal Pressure Angle
      4. Helix Angle
      5. Hand of Helix
      6. Pitch Diameter
      7. Profile Shift Coefficient
      8. Root Diameter
      9. Outside Diameter
      10. Number of Teeth Spanned
      11. Span Measurement
      12. Center Distance
      13. Normal Backlash with Mate
      14. Mate Number of Teeth
      15. Quality Standard and Accuracy Level
  2. Gear Dimensioning and Symbols
    1. Conventional Representations
    2. Datum Features
      1. Use of a Bore as a Datum Feature
      2. Use of a Journal as a Datum Feature
    3. Surface Finish Symbols
    4. Size Attributes
    5. Feature Attributes
      1. Bell Centers
      2. Tooth Tip Chamfer Dimension
      3. End Face Edge Chamfer Dimension
      4. Helix and Profile Modifications
        1. Crowning
        2. Circular End Relief
        3. Circular Tip Relief
      5. Thread Specifications for Tapped Holes
      6. Keyways and Keyseats
  3. Notes
    1. Material Notes
      1. Type of Metal
      2. Quality of Material
    2. Special Process Notes
      1. Surface Finish Notes
      2. Shot Peen Notes
      3. Coating Notes
    3. Heat Treatment Notes
      1. Through Hardening
      2. Case Hardening
    4. Quality Notes
      1. Finishing Processes
      2. Inspection Requirements

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