Blueprint Reading

Provided by: ToolingU

Blueprints are documents that contain three major elements: the drawing, dimensions, and notes. The drawing illustrates the views of the part necessary to show its features. Together, the extension and dimension lines on the drawing indicate dimensions and specific tolerance information of each feature. The notes contain administrative and global information about the part. A blueprint contains all instructions and requirements necessary to manufacture and inspect a part. An understanding of how to read a blueprint is critical to manufacture and inspect parts to accurate specifications. Accurate blueprint creation helps to ensure that finished parts will function in a way that meets the original intent. After taking this class, users should be able to read a basic blueprint and determine the critical features on a part that need to be measured.

Course Objectives:

  • Describe blueprints
  • Describe orthographic views
  • Distinguish between auxiliary views and section views
  • Distinguish between types of section views
  • Distinguish between object lines and hidden lines
  • Describe center lines
  • Distinguish between dimension lines and extension lines
  • Describe phantom lines, leader lines, and break lines
  • Describe cutting plane lines and section lines
  • Describe blueprint dimensions
  • Distinguish between types of dimensions
  • Describe tolerances
  • Describe the title block and change block
  • Explain scale and tolerance information in the notes section.

Recommended Background

  • Recommended for Manufacturing personnel, including technicians, engineers, and managers

Course ID







Communication, Critical Thinking, Personal Effectiveness, Blueprints, Manufacturing

Method of Delivery


Estimated Effort

3 hrs



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