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:
- Horizontal Arm.
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 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 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 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.
Probs of CMM
CMM probes are available in three main forms:
- Touch-Trigger probes
- Displacement Measuring CMM probes
- 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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