What surfaces and materials CMMs can measure

[WillAdams daw]

For machined parts, it is necessary to take into account and measure all sorts of parameters with a high degree of precision. What surfaces and materials CMMs can measure?

[rach black]

Based on a properly calibrated CMM machine and the expertise of a seasoned metrologist, it is possible to measure the following types of parts or surfaces using CMMs.
Angles. The same holds true for angles. Measuring plates with a sine bar and gage blocks can be precise if the inspector knows how to use these instruments. A sine plate measurement is time-consuming, and the accuracy and repeatability of an angle measured with an optical comparator are restricted, even with a vernier.

Radii and circles. Your CMM is ideally suited for measuring all round features, including holes, slots, cones, radii, spherical radii, roundness, and concentricity. The time savings and increase in precision provided by the CMM will astound you. The same holds true for determining distances between hole centers, especially if they are on different planes or axes. There are some restrictions, but we will discuss them shortly.

Profiles. Checking literally hundreds of points in a few seconds, a scanning CMM makes quick work of measuring profiles, which are almost hard to measure with plate techniques.

In addition, CMMs can collect the following data.
Straightness: the degree to which a 1D attribute resembles a theoretical straight line.
Flatness: the amount of variation along the surface of a 2D plane.
Roundness: the degree to which a 2D property, such as a bore or an extrusion, resembles a circle.
Cylindricity: the degree to which a 3D shape characteristic resembles a cylinder.
Conicity: the degree to which a 3D form feature resembles a cone.
Angularity: the degree to which a given angle matches its desired angle.

It is possible to measure every property that occurs in one, two, or three dimensions. Even better, contemporary CMMs permit 3D scans to be imported straight into design software, where any number of measurements may be performed with a few clicks.

CMMs have the capacity to measure complicated items quickly, precisely, and repeatedly. However, they are notorious for being picky and demanding, necessitating the use of specialized air-conditioned chambers as well as highly trained programmers in order to get the desired outcomes.

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