Cmm ppt
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CMM is a 3D measuring device used to measure dimensional characteristics of objects. It has three main components - a structure, probe system, and controller/software. Traditional CMMs have a fixed gantry structure and use touch probes to manually or automatically measure points. New developments include non-contact probes, faster computing, and portable CMMs suited for shopfloor use.
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Cmm ppt
- 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
- 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
- 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
- 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
- 12. CAD based Inspection Dimensional measurement Profile measurement Angularity or orientation measurement Shaft measurement Reverse Engineering
- 13. Thank You
Editor's Notes
- #11: C