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CMM - COORDINATE MEASURING MACHINE

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CMM - COORDINATE MEASURING MACHINE

  1. 1. BY PARTH GAJJAR(007) PARTH PANCHAL(003) APPROVED BY C.P. VITHLANI V.C. PATEL
  2. 2. A coordinate measuring Machine is a 3D device For measuring the Physical geometrical Characteristics of an object.
  3. 3. Description The typical 3 "bridge" CMM is composed of three axes, an X, Y and Z. These axes are orthogonal to each other in a typical three dimensional coordinate system. Each axis has a scale system that indicates the location of that axis. The machine will read the input from the touch probe, as directed by the operator or programmer. The machine then uses the X,Y,Z coordinates of each of these points to determine size and position with micrometer precision typically. Reference
  4. 4. Coordinate-measuring machines include three main components: A. The main structure which include three axes of motion B. Probing system C. Data collection and reduction system - typically includes a machine controller, desktop computer and application software
  5. 5. It is the sensory part of a CMM responsible for sensing different parameters required for the measurement.
  6. 6. After placing a workpiece on the machine table, a probe is used to measure different points on it by mapping the x, y, z coordinates. The probe operates either manually via an operator or automatically via a control system. These points are then uploaded to a computer interface where they can be analyzed using modeling software (e.g. CAD) and regression algorithms for further development.  How Do Coordinate Measuring Machines Work?
  7. 7. Mounting Sometimes a CMM requires a specific mounting style when incorporated into a system or method of operation. These mounting options include benchtop, freestanding, handheld, and portable. A. Benchtop:- machines mount on a benchtop or desk. This is typical of most CMMs. B. Freestanding:- machines can support themselves and do not require mounting. C. Portable machines:- are devices that may be moved freely and are not designed to be bolted or hardwired in place. Handheld machines are a subset of portable devices describing those designed to be operated by hand.
  8. 8. Dimensional measurement Profile measurement Angularity or orientation Depth mapping Digitizing or imaging Shaft measurement

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