Chapter-2 Parts of CMM machine

parts of cmm

Main Parts of CMM

Air Bearing

Under normal working pressure, the thickness of air space between air bearing and guide rail is fixed, which can ensure good repeatability of coordinate measuring machine.

air bearing cmm

If the pressure of air supply fluctuates, the change of the pre-tightening force of the air bearing will accordingly lead to the change of inter membrane space.

Scales & Encoders

A linear encoder is a sensor, transducer or readhead paired with a scale that encodes position. The sensor reads the scale in order to convert the encoded position into an analog or digital signal, which can then be decoded into position by a digital readout (DRO) or motion controller.

Source: Wikipedia

Prob system

CMM probs convert physical measurements into electrical signals. CMM probes have a wide classification for direct and comparative measurements.

cmm prob

CMM probes are available in three main forms:

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

Servo motors

DC motors are most commonly used in variable speed and torque applications. They include brush-less and gear motors, as well as servomotors


joystick is a low profile potentiometric controller providing precision multi-axes finger-positioning control.

Machine control system and software

The coordinate measuring machine (CMM) is a mechanical system that moves a measuring probe to determine the coordinates of points on the surface of a work piece. The CMM comprises: the machine itself; the measuring probe; the control system, and the measuring software

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