Methodological proposal for study and representation of surface roughness in plans (Original).

Abstract

Surface roughness cannot be ignored in parts drawings. When studying them in higher education specialties, in the discipline of Engineering Graphics, a deficiency has been detected when students cannot define what roughness value to establish for the surfaces of the piece they design and draw in the plan. They lack a table that allows establishing the Ra or Rz value indistinctly, since exercises referring to roughness which are available in the bibliography are basically reproductive. Under these circumstances a question arises: How to get the student to accurately define and represent roughness in technical plans from the elementary study of them, without resorting to reproductive methods? With the aim of contributing to the study of determination and representation of surface roughness in the plans of mechanical elements, a team of professors of the discipline Engineering Graphics, from the University of Granma, undertook the task of creating a methodology that would allow solving these shortcomings. The results, after 5 years of application, allow us to recommend the use of this methodology.