COORDINATING

MEASURING MACHINE

PRESENTATION ON

PRESENTED BY:

NIKHIL BHAGAT

(13MT07IND006)

INTRODUCTION

• Ogden developed an inspection machine in

1956,which is considered to be the first coordinate

measuring machine (CMM).

• A Coordinating measuring machine is an

electromechanical system design to perform

coordinate metrology.

• CMMs are also considered as transducers that can

convert physical measurements into electrical

signals.

• They are versatile in their capability to record

measurement of complex profiles with high

sensitivity (0.0025 mm) and speed.

COMPONENTS OF CMM

To accomplish measurements in 3-D, a basic CMM

is composed of the following components:

Probe head and probe to contact the workpart

surfaces

Mechanical structure that provides motion of the

probe in three Cartesian axes and displacement

transducers to measure the coordinate values of

each axis

In addition, many CMMs have the following

components:

Drive system and control unit to move each of the

three axes

Digital computer system with application software

COMPONENT OF CMM(CONT..)PROBE:

The contact probe is a key component of a CMM.lt indicates when contact has been made with the part surface during measurement.

The tip of the probe is usually a ruby ball. Ruby is a form of corundum (aluminum oxide), whose desirable properties in this application include high hardness for wear resistance and low density for minimum inertia.

Most probes today are touch-trigger probes which actuate when the probe makes contact with the part surface.

TYPES OF CMM

Ass per the mechanical structure the CMM are

classified into

six types , which are as follows:

CANTILEVER

MOVING BRIDGE

FIXED BRIDGE

HORIZONTAL ARM

GANTRY

COLUMN

MECHANICAL STRUCTURES OF

CMM

CMM WORKING 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.

CMM CONTROLLING

The methods of operating and controlling a

CMM can be classified into four main

categories:

Manual drive

Manual drive with computer-assisted data

processing

Motor drive with computer-assisted data

processing

DCC with computer-assisted data processing.

ADVANTAGES OF CMM

Dimensional measurement

Profile measurement

Angularity or orientation

Depth mapping

Digitizing or imaging

Shaft measurement

THANK

YOU