Chapter-17 | Advanced Measurement: Introduction of CMM(Coordinate Measuring Machine)

What is CMM?

CMM(Coordinate Measuring Machine) is an advanced measurement machine works for measure complex and large component. CMM is a device for measuring the physical characteristics of an object. The machine is controlled by a computer or an operator.

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CMM consists of 3-axis namely X-axis, Y-axis, Z-axis. Measurement is done by the prob attached to a third moving axis. This prob could be mechanical, optical, laser or white light.


So, the machine who takes reading in 6 DOF(Degree of freedom) known as CMM.

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Components of CMM

The 3 main component of CMM are-

  1. Machine itself (includes its 3-axis)
  2. Probing System
  3. Controllers & Softwares

Working Principle of CMM

CMM record X, Y, Z coordinates of the object and generate point which analysis by regression algorithm. This points are collected by Prob via direct computer control.


How does a CMM machine work?

A coordinate system is a lot like an elevation map where the combination of a letter along one edge of the map, a number along the other, and elevations shown throughout uniquely describes each location on the map.

cmm working example

This letter/number/elevation combination is called a coordinate and represents a specific place relative to all others.

A coordinate measuring machine (CMM) works in much the same way as your finger when it traces map coordinates;

 its three axes form the machine’s coordinate system. Instead of a finger, the CMM uses a probe to measure points on a workpiece.

Each point on the workpiece is unique to the machine’s coordinate system.

 The CMM combines the measured points to form a feature that can now be related to all other features.


Main Parts of CMM

  • Air Bearing
  • Scales & Encoders
  • Prob system
  • Servo motors
  • Joystick
  • Machine control system
  • Software

Pros of CMM

  • Single Setup
  • Accuracy
  • Improved Productivity
  • Reduced Setup Time

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2 thoughts on “Chapter-17 | Advanced Measurement: Introduction of CMM(Coordinate Measuring Machine)

  1. Do you having some special course for Cmm programmer

    1. Hi Anuj, Thanks for writing. We have only basic needful information about CMM. But we will consider this

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