Basics 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.

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.

Main Parts of CMM

  • Air Bearing
  • Scales & Encoders
  • Prob system
  • Servo motors
  • Joystick
  • Machine control system
  • Software
crysta plus mitutoyo cmm

This is Mitutoyo’s manual floating bridge type CMM coordinate measuring machines designed to achieve very high accuracy in a wide range of applications.The model type is CRYSTA-PLUS M is the intelligent alternative to the complex, cost-intensive measuring equipment with conventional  multi-point measuring devices.

Pros of CMM

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

Probs of CMM

CMM probes are available in three main forms:

  1. Touch-Trigger probes
  2. Displacement Measuring CMM probes
  3. Proximity or Non-contact Probes

Read more about Prob of CMM

Types of CMM


There are four basic types of stationary CMM:

  • Bridge.
  • Cantilever.
  • Horizontal Arm.
  • Gantry.

Read More about Types of CMM



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