1,720,995 research outputs found
Technical Drawing Learning Tool-Level 2: An interactive self-learning tool for teaching manufacturing dimensioning
No full textThis work presents an interactive self-learning tool named Technical Drawing Learning Tool-Level 2—TDLT-L2—for teaching manufacturing dimensioning to engineering students. The tool was designed for the students enrolled in the first year of the Bachelor in Management and Mechanical Engineering of the Universities of Brescia and Udine. It consists of a simple interactive tool, based on video and drawing animations, aimed at demonstrating the connection between real and simple machining processes and workpiece dimensions on technical drawing. TDLT-L2 is currently available in two versions: as a standalone application for Windows or Android based operating systems and as a set of interactive PDF documents. It was conceived as the first module of a package of tools that will be developed, based on the learning levels proposed in the Technical Drawing Evaluation Grid—TDEG. A preliminary evaluation of TDLT-L2 effectiveness was done involving the Management and Mechanical engineering students of Udine in some dimensioning exercises. The statistically considerations done on the obtained results confirmed the validity of the tool as a self-learning instrument with an average increase of marks of about 8.8%. © 2016 Wiley Periodicals, Inc. Comput Appl Eng Educ 24:519–528, 2016; View this article online at wileyonlinelibrary.com/journal/cae; DOI 10.1002/cae.21728. © 2016 Wiley Periodicals, Inc
STUDY & DESIGN OF A SPECIAL TEST BENCH FOR HYDROSTATIC SPINDLE HOUSINGS
No full textThis paper deals with the study, design, manufacturing & testing of a particular scientific instrument, functional to investigate hydrostatic bushing behaviour under various experimental conditions.
The job was conducted in concurrence with one of the leading companies in rotary transfer machines business. These machines are characterized by being turnkey solutions for the machining of parts requiring multi-sided machining processes and precision turning operations, starting from blanks or bar stock, for medium or high volume batch sizes. Typical rotary transfer architecture relies on a rotary table turret, where pieces to be machined are placed, rotating from one “station” to another. Each station has a particular process.
Transfer machines are designed for a wide range of applications while production rate is as maximum up to 12.000 pieces/hour, with complete retooling in less than 1h.
It must be understood that in a typical application, each station can comprise 2-3 machining “units” with their own spindle and its translating housing. For standardization purposes, there are a limited number of possible basic designs in machining “units”, subsequently each of them is accessorized to be functional to its target operation.
Among them, one of the most prestigious is the hydrostatic unit, in which spindle assembly is contained in a sliding tube supported by a set of hydrostatic bushings. In this paper we will detail the design of a “research & test” bench whose aim is to help in developing new hydrostatic bushing systems and check production units, for quality issues
Progettazione di un forno sperimentale per la fusione dell'alluminio
No full textIn this paper we describe all the phases, from conception to start on, regarding an experimental oven, developed to carry out experiments on aluminium foundry alloy.
The project, which is interdisciplinary characterised, was born in the research area of the Laboratory of Chemistry for the Technologies based in the Department of Mechanics and Industrial Engineering of our Faculty, researches that are funded by some companies operating in the fields of the foundry and the thermally resisting materials. A need was raised for an experimental apparatus able to focus and verify some hypothesis over some physics and chemistry phenomena that compromise the correct operating activity of industrial ovens for aluminium alloy, phenomena that cause expensive maintenance operations.
The normal industrial ovens are not suitable to perform the requested research activity, that requires monitoring of several chemical and physical parameters, in areas that, in the normal industrial ovens, are not accessible. Consequently an experimental oven was conceived and developed, with a reduced operating volume, to reduce operating costs, however it is representative of the physical reality of the industrial oven. It also provides the possibility to carry out unusual operations and to monitor parameter and samples withdrawal
DESIGN OF A FACILITY TO HOST MICRO-ORGANISMEXPERIMENT IN SPACE
No full textThe current state of the space journeys offers the possibility of executing experiments in orbit in order to use the
microgravity environment for scientific investigations. In the world of the space programs both American and
European agencies offer the possibility of disposing of spaces arranged to accommodate some sets of scientific
experiments.
Several research activities are developing on the possibility of disposing of such spaces. The ESA (European
Space Agency) is developing a new kind of Facility to be put at disposal of the international scientific
community. Such Facility will be constituted, in synthesis, by a system of two centrifuge each containing 4 sites
with suitable interfaces for experiments.
This will allow to realise any gravity condition, between zero and the terrestrial gravity, or to execute
comparative tests. The Facility offers a reduced space (about 60x60x100mm) for every scientific experiment.
The abstract describes the study and the preliminary design of an equipment to be stored in this space, which
executes the operations of cultivation (feeding, washing Etc..). of a series of samples of colonies of basic
organisms
Issues in learning engineering graphics fundamentals: Shall we blame cad?
No full textSeveral studies report that many novice engineers result to be skilled in CAD but poor in knowledge of the basics, visualization and spatial skills and ability in freehand sketching. There is a debate on if such lack of fundamentals dues or not to the increasing role of CAD and the decreasing role of manual drawing in the basic courses of engineering graphics. This study aimed to investigate the issues related to the use of CAD and manual drawing in teaching engineering graphics fundamentals by a review of the literature of the Engineering Design Graphics Journal and the International Journal of Technology and Design Education from 2000 to date. It was found that current students: have a lower initial level of knowledge and experience; have little chance to develop sketching and visualization skills if trained only by CAD; and their assessment usually focuses more on CAD skills than on the knowledge of the basics. Solutions proposed to such issues are: introductory courses of manual drawing at college and high schools; assessment of students' initial skills; and tests more focused on the knowledge of the rules and basics of engineering graphics language
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