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.
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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-
- Machine itself (includes its 3-axis)
- Probing System
- 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.
How does a CMM machine work?
A coordinate system is a lot like an elevation map where the combination of a letter along one edge of the map, a number along the other, and elevations shown throughout uniquely describes each location on the map.
This letter/number/elevation combination is called a coordinate and represents a specific place relative to all others.
A coordinate measuring machine (CMM) works in much the same way as your finger when it traces map coordinates;
its three axes form the machine’s coordinate system. Instead of a finger, the CMM uses a probe to measure points on a workpiece.
Each point on the workpiece is unique to the machine’s coordinate system.
The CMM combines the measured points to form a feature that can now be related to all other features.
Main Parts of CMM
- Air Bearing
- Scales & Encoders
- Prob system
- Servo motors
- Machine control system
Pros of CMM
- Single Setup
- Improved Productivity
- Reduced Setup Time
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