A coordinate measuring
Machine is a 3D device
For measuring the
Characteristics of an
The typical 3 "bridge" CMM is
composed of three axes, an X, Y and
These axes are orthogonal to each
other in a typical three dimensional
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.
Coordinate-measuring machines include three main
A. The main structure which include three axes of
B. Probing system
C. Data collection and reduction system - typically
includes a machine controller, desktop computer and
It is the sensory part of a CMM responsible for sensing
different parameters required for the measurement.
After placing a workpiece on the machine
table, a probe is used to measure different
points on it by mapping the x, y, z
The probe operates either manually via an
operator or automatically via a control
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
How Do Coordinate
Sometimes a CMM requires a specific mounting style when
incorporated into a system or method of operation. These
mounting options include benchtop, freestanding, handheld,
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.
Angularity or orientation
Digitizing or imaging