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Sensor Prototype to Evaluate the Contact Force in Measuring with Coordinate Measuring Arms.

Cuesta E, Telenti A, Patiño H, González-Madruga D, Martínez-Pellitero S - Sensors (Basel) (2015)

Bottom Line: The paper also describes the monitoring software that reads the signals in real time, the calibration procedure of the prototype and the validation tests oriented towards increasing knowledge of the forces employed in manual probing.Several experiments read and record the force in real time comparing different ways of probing (discontinuous and continuous contact) and measuring different types of geometric features, from single planes to exterior cylinders, cones, or spheres, through interior features.The final goal of this research is to improve the probing technique, for example by using an operator training programme, allowing extra-force peaks and bad contacts to be minimized or just to avoid bad measurements.

View Article: PubMed Central - PubMed

Affiliation: Department of Manufacturing Engineering, University of Oviedo, Campus de Gijón, Asturias 33203, Spain. ecuesta@uniovi.es.

ABSTRACT
This paper describes the design, development and evaluation tests of an integrated force sensor prototype for portable Coordinate Measuring Arms (CMAs or AACMMs). The development is based on the use of strain gauges located on the surface of the CMAs' hard probe. The strain gauges as well as their cables and connectors have been protected with a custom case, made by Additive Manufacturing techniques (Polyjet 3D). The same method has been selected to manufacture an ergonomic handle that includes trigger mechanics and the electronic components required for synchronizing the trigger signal when probing occurs. The paper also describes the monitoring software that reads the signals in real time, the calibration procedure of the prototype and the validation tests oriented towards increasing knowledge of the forces employed in manual probing. Several experiments read and record the force in real time comparing different ways of probing (discontinuous and continuous contact) and measuring different types of geometric features, from single planes to exterior cylinders, cones, or spheres, through interior features. The probing force is separated into two components allowing the influence of these strategies in probe deformation to be known. The final goal of this research is to improve the probing technique, for example by using an operator training programme, allowing extra-force peaks and bad contacts to be minimized or just to avoid bad measurements.

No MeSH data available.


Related in: MedlinePlus

Average values of force for cones. (Top) axial; (Bottom) bending.
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sensors-15-13242-f012: Average values of force for cones. (Top) axial; (Bottom) bending.

Mentions: Last, the average forces for the operator and the feature were calculated (axial and bending). These values were calculated as the average value of force when the triggering signal was activated. For instance, Figure 12 shows the average values for the measurement of an internal cone. This feature was selected because the contribution of the two forces is more relevant. Although both forces seem to be similar in size, bending force has a stronger impact on the measurement error since its deformation is around 10 times more than in the case of axial forces. As a result, point-to-point measurement is preferred for this type of feature.


Sensor Prototype to Evaluate the Contact Force in Measuring with Coordinate Measuring Arms.

Cuesta E, Telenti A, Patiño H, González-Madruga D, Martínez-Pellitero S - Sensors (Basel) (2015)

Average values of force for cones. (Top) axial; (Bottom) bending.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4507632&req=5

sensors-15-13242-f012: Average values of force for cones. (Top) axial; (Bottom) bending.
Mentions: Last, the average forces for the operator and the feature were calculated (axial and bending). These values were calculated as the average value of force when the triggering signal was activated. For instance, Figure 12 shows the average values for the measurement of an internal cone. This feature was selected because the contribution of the two forces is more relevant. Although both forces seem to be similar in size, bending force has a stronger impact on the measurement error since its deformation is around 10 times more than in the case of axial forces. As a result, point-to-point measurement is preferred for this type of feature.

Bottom Line: The paper also describes the monitoring software that reads the signals in real time, the calibration procedure of the prototype and the validation tests oriented towards increasing knowledge of the forces employed in manual probing.Several experiments read and record the force in real time comparing different ways of probing (discontinuous and continuous contact) and measuring different types of geometric features, from single planes to exterior cylinders, cones, or spheres, through interior features.The final goal of this research is to improve the probing technique, for example by using an operator training programme, allowing extra-force peaks and bad contacts to be minimized or just to avoid bad measurements.

View Article: PubMed Central - PubMed

Affiliation: Department of Manufacturing Engineering, University of Oviedo, Campus de Gijón, Asturias 33203, Spain. ecuesta@uniovi.es.

ABSTRACT
This paper describes the design, development and evaluation tests of an integrated force sensor prototype for portable Coordinate Measuring Arms (CMAs or AACMMs). The development is based on the use of strain gauges located on the surface of the CMAs' hard probe. The strain gauges as well as their cables and connectors have been protected with a custom case, made by Additive Manufacturing techniques (Polyjet 3D). The same method has been selected to manufacture an ergonomic handle that includes trigger mechanics and the electronic components required for synchronizing the trigger signal when probing occurs. The paper also describes the monitoring software that reads the signals in real time, the calibration procedure of the prototype and the validation tests oriented towards increasing knowledge of the forces employed in manual probing. Several experiments read and record the force in real time comparing different ways of probing (discontinuous and continuous contact) and measuring different types of geometric features, from single planes to exterior cylinders, cones, or spheres, through interior features. The probing force is separated into two components allowing the influence of these strategies in probe deformation to be known. The final goal of this research is to improve the probing technique, for example by using an operator training programme, allowing extra-force peaks and bad contacts to be minimized or just to avoid bad measurements.

No MeSH data available.


Related in: MedlinePlus