Papers by Author: Joaquín Barreiro

Abstract: Portable Measuring Arms or Articulated Arm Coordinate Measuring Machines (AACMMs) unique characteristics bring flexibility to the inspection task and allow outside laboratory measurements. However, still a few works study their metrological behavior, uncertainty or assessment. In fact, AACMM assessment involves time consuming and expensive processes mainly inherited from CMM field. A virtual circle gauge similar to ball bars and a methodology based on international standards are proposed in order to simplify the evaluation test. Additionally, two metrological laboratories have evaluated different AACMM models with this gauge. Also, two gauge lengths (distance between circles) have be included in this study. Results have proved that virtual circle gauges are suitable to evaluate AACMMs and tested the influence of distance between virtual circles.

Abstract: This paper presents the methodology that is being applied at present time for teaching and evaluation of different courses in the area of manufacturing processes engineering at the University of León. The context is delimited to the use of content management systems and continuous evaluation of learning. In particular, the Moodle platform is used for structuring the contents and for the continuous evaluation of courses in the scope of materials science, manufacturing processes and automation of operations. An analysis of the changes and challenges derived from the adoption of this methodology in the different courses in which has been applied is presented. These changes have been slightly different as a function of the compulsory or optional character of courses, as well as depending on the number of students enrolled in them.

Abstract: Wear level of tool inserts in automated processes is tried using techniques of artificial vision. An application has been developed in Matlab that allows the acquisition of images with different resolutions and later on to process them. It is explained how the vision system used has been designed and implemented. The method for acquiring tool insert images and their treatment in the pre-processing, segmentation and post-processing is commented. First results are also presented using diverse texture descriptors. These first results must be corroborated carrying out new experiments with a bigger number of images.