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What is CMM? and types of Coordinate Measuring Machine.

What is CMM ?

The full form of  CMM is Coordinate Measuring Machine. It  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.

Types of CMM

There are four basic types of stationary CMM:

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

Bridge type CMM

bridge type cmm

Bridge CMMs are the most common type of coordinate measuring machine.

It is used for High accuracy, moderate flexibility, for medium sized components.  

Cantilever CMM

Mitutoyo cantilever cmm
Mitutoyo shop-Flore CMM

Cantilever CMMs differ from the bridge-style in that the measuring head is only attached on one side of a rigid base.

This type of CMM is used for Highest Accuracy, Lowest Flexibility, for small sized components.

Horizontal arm CMM

horizontal arm cmm
Swan horizontal arm CMM

Horizontal arm CMMs are less accurate than the other type fo CMM.  because of their design.However, it also makes them useful for measuring large workpieces or components.

This is used for Lowest accuracy, Highest flexibility, for very large components.

Gantry CMM

Gantry CMMs are designed similar to bridge type CMMs, but tend to be much larger. 

Gantry CMM is used for High accuracy, Moderate flexibility for large components.

Gantry cmm
Image: Mitutoyo

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 Probs of CMM

Parts and Principle of CMM

Read more about Principle and Parts of CMM

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Posted on 5 Comments

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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