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A coordinate-measuring machine (CMM) is a device that measures the geometry of physical objects by sensing discrete points on the surface of the object with a probe. Various types of probes are used in CMMs, the most common being mechanical and laser sensors, though optical and white light sensors do exist.
The theory of CMM was developed in the mid-1970s by W. Barnett Pearce (1943–2011) and Vernon E. Cronen. Communication Action and Meaning was devoted to CMM, is a thorough explication of CMM, which Pearce and Cronen introduced to the common scholarly vernacular of the discipline.
The CMM was developed from 1987 until 1997. In 2002, version 1.1 was released, version 1.2 followed in August 2006, and version 1.3 in November 2010. Some major changes in CMMI V1.3 [ 5 ] are the support of agile software development , [ 6 ] improvements to high maturity practices [ 7 ] and alignment of the representation (staged and continuous).
The Capability Maturity Model Integration (CMMI) project was formed to sort out the problem of using multiple models for software development processes, thus the CMMI model has superseded the CMM model, though the CMM model continues to be a general theoretical process capability model used in the public domain. [16] [citation needed] [17]
Coordinate-measuring machine, a device for dimensional measuring; Coordinated management of meaning, a communications theory; Cybersecurity maturity model, a type of maturity model; C--, also pronounced Cmm, a programming language
A CMM provides a rapid method for inspecting absolute points, but geometric relationships, such as runout, parallelism, perpendicularity, etc., must be calculated rather than measured directly. By aligning an accurate spindle with an electronic test indicator with a geometric feature of interest, rather than using a non-scanning cartesian probe ...
Cylindrical coordinate measuring machine or CCMM, is a special variation of a standard coordinate measuring machine (CMM) which incorporates a moving table to rotate the part relative to the probe. The probe moves perpendicular to the part axis and radial data is collected at regular angular intervals.
A ROMER Arm is a term for a portable coordinate measuring machine ROMER, a company Acquired by the Hexagon AB group, and part of the Manufacturing Intelligence division, designed the ROMER arm in the 1980s to solve the problem of how to measure large objects such as airplanes and car bodies without moving them to a dedicated measuring laboratory.
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