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Difference between ULM and CMM Machine

ULM vs CMM Machine

The ULM stand for Universal Length Measuring Machine and CMM means Coordinate Measuring machine. 

ULM is a 2D type of measuring machine and CMM is an advanced 3D measurement machine. 

UMM(Universal Measuring Machine) consists of a rigid bed called Universal Measuring Table which is a flow-table or can be fixed according to requirement. 

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CMM is an advanced measurement machine that works to measure complex and large components. 

UMM equipped with the extra mechanism used for inspection of thread ring gauge both internal and external, plug gauge, snap gauge, bore ring, taper gauge, etc.


They are equipped with mechanisms, which enable quick and fine table adjustment. For the self-centring of a job, one pair of support blocks is provided.

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 that takes reading in 6 DOF(Degree of freedom) is known as CMM.

ULM consists of supporting fixed carriage also known as head and movable measuring carriage. 

ulm parts

The distance between these two is adjustable, which depend upon the specification of the model of a machine under consideration. 

Main Features of UMM

  • High Measuring accuracy about 0.0001 mm
  • Updated Measuring types of equipment
  • Advanced Display Unit
  • Easy and quick accessory exchanged
  • By Computer, process analysis and control is simple
  • High resistance to wear.
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Advantages of CMM

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

Computer support with ULM is provided for acquiring, processing, logging and transmitting measuring data.

Operating reliability and comfort by linking both measuring systems so as to make all information available on a single screen.

Application of CMM

  1. Product quality inspection
  2. Understand the adjustment status of the equipment.

1 thought on “Difference between ULM and CMM Machine

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