Surface and form

Coordinate measuring machine (CMM)Coordinate measuring machine (CMM)

Also called: coordinate measuring machine, CMM

≡Standards, measuring range and accuracy

Standard

JIS B 7440 series (Acceptance and reverification tests for coordinate measuring machines; -1:2003 vocabulary, -2:2013 length measurement, -5:2022 styli, etc.)
ISO 10360 series (thought to be the international standard corresponding to JIS B 7440, but its ISO bibliographic data is unconfirmed)

^[1][2]

Measuring range

—Not confirmed in public sources

Resolution / graduation

—Not confirmed in public sources

Accuracy (instrument error / maximum permissible error)

Approach Uncertainty varies with the point layout and the way datums are set, so a general uncertainty estimate is difficult (Mitutoyo)

^[2][3]1 source, for reference

▦Types

Moving bridge, fixed bridge, horizontal arm, bridge (floor) type

^[2][3]1 source, for reference

Contact articulated-arm type

^[4]1 source, for reference

◎Part names and functions

#	Name	English	Function
1	Probe (ball of ruby, ceramic, etc.)	Probe / stylus ball	Touches the workpiece to take point coordinates.^[4]
2	X, Y, Z axes (carriage, bridge, ram)	Axes	^[2]

◷How to read the scale

Calculates features such as lines, circles, planes and cylinders from the point cloud, and finds dimensions and geometric tolerances such as flatness, parallelism, squareness and position^[4]

✋Usage steps

Printed from Kezuriba (kezuriba.net/en/gauges/cmm/)

✓Care, storage, inspection and calibration

Care and storage

Inspection and calibration

Acceptance and reverification tests for length measurement error, etc. are performed under the JIS B 7440 series^[2][1]

Overview only.

⇄Related instruments

Surface roughness tester (stylus type)Height gauge

📚Sources

Content without a mark is what agreed across two or more sources from different publishers. Procedures and cautions are summarized in Kezuriba's own words based on the sources, and the diagrams were drawn by Kezuriba. Accuracy values are manufacturers' published figures, not values from JIS tables.