Print Reading

Engineering drawings (often still called blueprints) are the means of communicating the necessary requirements of a product or assembly. While much of a drawing is devoted to the different visual views, there is a great deal of other information to understand. This one-day course covers the basic areas of interpreting mechanical drawings, from the details found in a title block to the meaning of different line types to a proper method for visualizing a part from the two-dimensional images. Participants will also learn how to interpret dimensions and tolerances, and review several sample drawings throughout the day.

Class Details

Class Name:
Print Reading
Product engineers, inspectors, machinists, CAD designers, manufacturing engineers, tool and die makers, gage designers and makers, management personnel, and support staff who need to understand mechanical prints.
2 Day Course

Learning Objectives

  • Describe the role blueprints play in the design and manufacturing process.
  • List the seven main steps in reading a drawing.
  • Identify the different types of lines used on drawings.
  • Explain the different types of two-dimensional and three-dimensional views.
  • Interpret orthographic projection views.
  • Explain the difference between first-angle and third-angle projection.
  • Interpret auxiliary and section views.
  • Describe the items found within a title block.
  • Interpret callouts for special features such as screw threads and surface roughness.
  • Identify proper dimensioning and tolerancing techniques.
  • Determine if all necessary information for a part is given on a print.

Outline At-a-Glance

  • Importance of engineering drawings
  • Basic steps in reading an engineering drawing
  • Different line types (hidden, phantom, etc.)
  • Pictorial vs. orthographic projection
  • How to visualize a part from orthographic views
  • First-angle vs. third-angle projection
  • The title block
  • Interpreting general and local notes
  • Auxiliary views
  • Section views
  • Screw threads
  • Surface roughness
  • Other common callouts
  • Dimensioning practices
  • Plus/minus tolerances
  • Calculating unknown dimensions
  • Introduction to GD&T
  • Review of sample drawings
  • Wrap-up

Job Roles