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| Author(s): |
Marcelo Del Guerra
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Carlos. |
| Institution: | Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD) |
| Defense date: | 2009-02-16 |
| Examining board members: |
Reginaldo Teixeira Coelho;
Alvaro Jose Abackerli;
Lincoln Cardoso Brandão;
Renato Goulart Jasinevicius;
Alessandro Roger Rodrigues
|
| Advisor: | Reginaldo Teixeira Coelho |
| Abstract | |
The objective of this work is to research commercially available transducers to be used for trigger signal generation in 3D touch trigger probes for CNC machine tools. First, a variety of transducers was compared to verify witch one best suit the application according to the developed metrics. Resistive and piezoresistive strain-gages obtained the best rating from the comparison. The strain-gages were then experimented using a milling machine, where touch trigger probes are widely used, to acquire information regarding transducers signal/noise ratio, thermal sensibility, step response and repeatability. Also, the repeatability of a mechanism developed to generate trigger signal based on electrical contact, widely used technique, was calculated using the same milling machine. The comparative results between the two strain-gages showed that piezoressitive model is more suitable for the application, with repeatability (\'+ OU -\' 6 SD) equal 0,23 \'mü\'m, also showing smaller thermal sensibility and smaller step time response. The experiments to determine the repeatability of the electrical contact mechanism showed results (\'+ OU -\' 6 SD) equal 0,16 \'mü\'m. The main conclusion of this work shows that piezoresistive strain-gages transducers can be used to generate trigger signal in touch trigger probes as a substitute to the electrical contact system, showing advantages regarding pre-travel variation (AU) | |
| FAPESP's process: | 05/00031-7 - Study and development of in-process measurement systems for machining applications with CNC machine-tools |
| Grantee: | Marcelo Del Guerra |
| Support Opportunities: | Scholarships in Brazil - Doctorate |