CMMs are used for various purposes, including quality inspection, field inspection, creating maps for existing equipment, and measuring worn parts for refurbishment.

A CMM can quickly and accurately obtain measurements of many geometric features that would otherwise be difficult to measure. For example, a CMM can easily inspect the profile of a surface to determine if a turbine blade is built with the appropriate curvature or not. Other features commonly measured with CMMs include flatness, straightness, roundness, cylindricity, profile of a line (from a complex curve), concentricity, symmetry, and the position/orientation of axes.

The operation and programming of Coordinate Measuring Machines are typically performed by someone who has received specific training for this purpose. Training materials and courses related to CMM operations are usually available from the equipment manufacturer. Since CMM operators are often assessing the dimensions of a part against a plan or drawing, the ability to read technical drawings, industrial blueprint reading, and knowledge of dimensional and geometric tolerances and measurement methods are essential for this personnel.

Key Points:

1. 3D Point Cloud Creation Measuring and recording the X, Y, Z coordinates for each measured point creates a three-dimensional point cloud that can be compared with a CAD drawing.
2. Variety in Shapes and Sizes CMMs are available in various shapes and sizes with different levels of precision.
3. Precision in Mechanical Parts Measurement CMMs are used for the precise measurement of mechanical parts.
4. Measuring Complex Features CMMs can accurately measure features that would otherwise be very difficult to describe.
5. Need for Technical Understanding Proper use of CMMs requires an understanding of industrial blueprint reading, knowledge of dimensional and geometric tolerances, and measurement methods.