cmm - coordinate measuring machine

BY PARTH GAJJAR(007)

PARTH PANCHAL(003)

APPROVED BYC.P. VITHLANI

V.C. PATEL

A coordinate measuring

Machine is a 3D device

For measuring the

Physical geometrical

Characteristics of an

object.

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

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

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 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?

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.

Dimensional measurementProfile measurementAngularity or orientationDepth mappingDigitizing or imagingShaft measurement