Inspecting with CMMs

Provided by: ToolingU

A CMM’s probe contacts the various features on a workpiece and records their Cartesian coordinate locations with software. CMMs measure using either contact or noncontact methods and can be used in a lab or on the production floor. CMMs use either manual operation, joystick, or DCC to guide components. As long as the operator is trained in its use, the CMM provides high accuracy measurements with minimum human influence in a very short amount of time. This allows the operator to respond to machining errors and reduce scrap. After this class, users should be able to describe best practices for using the CMM to inspect parts.

Course Objectives:

  • Describe the CMM and its main components
  • Distinguish between measured and constructed features
  • Define datum
  • Distinguish between the machine coordinate system and the part coordinate system
  • Describe the purpose of alignment
  • Identify types of software used on a coordinate measuring machine and describe their purpose
  • Describe different methods for programming a coordinate measuring machine
  • Describe how coordinate measuring machines prevent or compensate for environmental influences
  • Compare the characteristics of air bearings, magnetic bearings, and mechanical bearings
  • Identify the common types of CMMs
  • Describe the probe
  • Compare the characteristics of manual and joystick controls
  • Describe the operation of a direct computer control
  • Describe the interaction of the scale with the encoder
  • Describe how a contact probe inspects a part
  • Describe how a noncontact probe inspects a part
  • Describe the methods and benefits of incorporating CMMs into production processes.

Recommended Background

  • Recommended for manufacturing personnel, particularly for the quality control and inspection department.

Course ID







Communication, Critical Thinking, Personal Effectiveness, Coordinate Measuring Sysytem (CMM), High Accuracy Measurements, Inspection

Method of Delivery


Estimated Effort

3 hrs



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