Length Metrology
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Christy, Mr. Dewey
Retired from Mhar Federal. Contributed to standards and measurement practice.
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– Length Metrology Basics
Techniques and tools used to measure linear dimensions with high accuracy across various manufacturing environments.
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Portable Robot Arm CMM
A portable robot arm CMM (Coordinate Measuring Machine) is a lightweight, articulated measuring arm which aids in performing 3D measurements, on the shop floor, in inspection labs, or in field applications.
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Special-purpose Gauges
Special-purpose gauges for checking multiple dimensions.
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Coordinate Measurement Machine (CMM)
A coordinate measuring machine (CMM) provides precise measurement of the dimensions and geometry of physical objects. A probe or sensor detects points on the object’s surface, and the 3D position of each point is recorded. From this point cloud, the object’s features can be mapped in relatively high resolution, and dimensions can be extracted for product design, quality…
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TESA Technology
TESA manufactures precision measuring instruments, such as height gages, and dimensional metrology systems.
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Optical Projector (Optical Comparator)
An optical projector, or optical comparator, projects an enlarged image of a test sample onto a screen which also has a calibrated scale or reticle. Length dimensions and sdrew thread profiles can be measured by directly comparing the projected image to the scale or by using the stage movement to align specific points on the image…
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Fixed Gages
Fixed Gage standards are used to quickly check length dimensions for in-process and final inspection. These include pin gages, drill gages, sheet and wire gages, center gages, screw pitch gages, radius gages, ball and diameter gages, angle gages, thickness gages, and feeler stock.
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Pneumatic Comparator
A comparator measures the accuracy of a dimension by comparing it against a standard length. A pneumatic comparator uses compressed air, or a pneumatic system, to magnify the dissimilarity when the difference is very small. A pneumatic comparator, or air plug gage. is connected to a source of compressed air creating a reference pressure. The…
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Electronic Comparator
High-resolution measurement systems that convert displacement into electronic signals for digital display.
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Shop Floor Measuring Instruments
Basic handheld or stand-mounted tools used for quick and direct length measurements on the production floor:
