By-

Mayur Andulkar

MTech(CAD CAM)

CMM is a 3D device for measuring 3

dimensional charateristics

Manual or Automatic control

Typically 3 axes : X,Y & Z

Configurations of CMM:◦ Traditional (Fixed) type

◦ Portable CMM

Articulated arm

Laser tracker

3 main components:◦ Body/ Structure

◦ Probe system

◦ Controller and software

Structure:◦ Fixed: Gantry, Cantilever or bridge type

◦ Structure mounted on air bearings

◦ Errors in structure

◦ Structure material: Granite, Ceramic, etc

◦ Temperature sensors: Invar material

Probe System◦ Mechanical touch type

◦ Touch trigger electronic probe

Spring loaded steel ball stylus

◦ Optical Probes – CCD camera , 2D image

◦ Scanning probes

Contact type and non contact type

◦ Micrometrology probes

Control or Computing System

The structure of CMM has remained the same

New technology developments in:

◦ Probe system

Non Contact type

◦ Software and controllers

Faster computing

◦ Industrial Requirements

CMM on shopfloor

Multi Sensor Measuring◦ Incorporates touch, optical or laser sensors

◦ Operator can choose which sensor to use

◦ All work done in single setup

◦ Faster

◦ The co ordinates might not be correct owing to inputs

from many sensors

5 Axis CMM◦ Revolutionary technology by Renishaw

◦ 2 axes controlled by servo

◦ Faster and quicker

◦ Not supported by OEM’s

3 D Scanner

◦ Many technologies are used

◦ Color as well as contour information collected

◦ Technology

Contact type (eg. CMM)

May damage the object

Relatively slow

Non Contact type

Active (Emit radiations eg. X ray, UV,Infrared etc)

Passive (Take the radiations emitted naturally)

CMM Retrofitting

◦ Much Less costly

◦ Frame is not damaged much

◦ Software changes can be easily incorporated

◦ Better accuracy and precision by using

advanced probe systems

CAD based Inspection

Dimensional measurement

Profile measurement

Angularity or orientation measurement

Shaft measurement

Reverse Engineering

Thank You