A coordinate measuring machine (CMM) is a device used to measure physical geometric characteristics of objects. It consists of three main axes (X, Y, Z), a probing system, and a data collection system. The probing system senses measurement points on a workpiece placed on the machine table, mapping their x, y, z coordinates which are analyzed using software. CMMs can be benchtop, freestanding, handheld or portable depending on their mounting style and are commonly used for dimensional measurement, profile measurement, and other applications.

1. COORDINATE MEASURING
MACHINE
BY
PRAJAPATI JIGAR
GUIDED BY
MR. CHIRAG M.AMIN

2. DEFINITION
A coordinate measuring
Machine is a 3D device
For measuring the
Physical geometrical
Characteristics of an
object.

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. Parts
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. DEFINITION OF PROBE
 It is the sensory part of a CMM responsible for sensing
different parameters required for the measurement.

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. TYPES OF CMM

8. 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.

9. Common Applications
 Dimensional measurement
 Profile measurement
 Angularity or orientation
 Depth mapping
 Digitizing or imaging
 Shaft measurement