2. 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.
4. 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
5. 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
6.
7. 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
8. 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
9.
10. 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)
11. 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
