81726 - Mechanical and Industrial Drawing T

Learning outcomes

Students acquire basic skills (knowledge) for drawing all the main machine or plant components and understanding drawings already made by others. After a brief introduction to the geometrical bases, it treats, according to the italian standards, the rules and norms for the right representation of each component, by accounting for the function it plays into the device or assembly and for the cycle it experiences during its manufacturing.

The course, sited at the third year of the first cycle degree in Engineering Managment, can exploit knowledges acquired by the Students in the previous classes, so that a non-theoretical training can be provided, by utilizing computer aided tools or hand sketches, with the aim of allowing the Student to acquire practical skillness in designing the right shape according to productive processes and functional aspects of components and assemblies characteristic of industrial and mechanical area.

Course contents

Immediately below, main arguments of this course are reported. A more detailed program (in italian) is offered by the teachers.

The course consists in a 3 CFU theoretical module and a 3 CFU CAD laboratory, which are performed in parallel and coordinated to afford simoultaneously the same arguments by a theoretical and practical point of view.

Introduction. Conventional and unconventional tools for design and drafting. Use of standard line types and lettering. Utilization of formats and drawing scale.

Descriptive Geometry

Basic geometrical constructions.

Ortographic Mongian projections.

True shape representation of planar surfaces arbitrarily oriented with respect to orthographic projection planes. Sectional views of solids.

Intersections among solids.

Axonometric Pictorial parallel projections (hints).

Design process, standards, dimensioning and error restriction

First and third-angle stardard methods for projection and sectional views. Dimensioning. Design process: assembly and single component drawings. Fuctional dimensioning. Production process influence on shape and dimensioning of mechanical components. Fabrication and control dimensioning.

Standards for facing and restricting macro and micro-geometrical errors (hints).

Description and conventional representation of component assembly devoted to specific tasks

Fasteners and connections. Threaded fasteners. Keys. Splines. Rivets. Welds. Adesive joints.

Guides and bearings. Journal bearings. Rolling contact bearings. Lubrication.

Mechanical Transmission. Shafts, clutches, couplings, belts and pulleys, roller chains, gears, cams, etc.

Readings/Bibliography

Direct references to theory lessons

The teaching material and all the further information, can be asked to the Teacher.

In the same site some previous exams are included at disposal for the Students.

Reference books

Manfè, Pozza, Scarato, Disegno meccanico, vol. 1, 2, 3, ed. Principato, Milano.

Conti, Disegno tecnologico, vol. 1, 2, ed. Pitagora, Bologna.

Chirone, Tornincasa, Disegno Tecnico Industriale, ed. Il Capitello, Torino.

Sobrero, Corso di Disegno, solo vol. 1, ed. Pitagora, Bologna.

In-depth books

UNI M1, Norme per il disegno tecnico, vol. 1,2, pubblicato a cura dell'Ente Nazionale Italiano di Unificazione. piazza Armando Diaz 2, 20123 Milano.

Filippi, Disegno di Macchine, vol. 1, 2, ed. Hoepli, Milano.

Straneo, Consorti, Disegno di Costruzioni Meccaniche, vol. 1, 2, ed. Principato, Milano.

Teaching methods

Course configuration:
- theorethical room classes (3 CFU);
- practical laboratory activities (3 CFU, devoted to Computer Aided Design).

Attending classes is considered an important task for the Student, allowing him to understand how drawings must be performed. Teacher makes a lot of examples during theorethical lessons and takes with him many mechanical actual assemblies and components at disposal for the Students to be seen in classroom.

Laboratories are similarly important, because Teachers stay among Students explaining mistakes and giving them suggestions.

For this reason, both Teachers record frequency during lessons and laboratory.

As reported in the document Regolamento del Corso e degli Esami, lack of frequency to CAD laboratories implies for the Students a further individual CAD test.

Minimum number of hours to validate frequency depends on laboratory timetable pertaining to the specific academic year and it is specified, at the beginning of the course, by the Teacher who holds classes in the Laboratory module.

Assessment methods

Exam consists in a CAD test (compulsory for admission to the speech) and a speech (oral test).

a) CAD test, consists in a computer aided representation of a mechanical or industrial component. During this phase, Students can read texts, notes, tables and manuals, but are, obviously, prevented to make any connection to the external network. Admission to Oral examination is conditioned upon being successful in CAD test;

CAD test lasts 3 hours.

Results of the written test are published inside web site : https://iol.unibo.it/

Admission to oral test is conditioned upon being successful in CAD test; Student must reach 18/30, which is score obtained in the CAD test measured on a base of thirty.

The course is not mandatory for the Butchelor Degree of Engineering Managment and Students are generally not too many; so CAD test can be usually performed in the morning and Oral test in the afternoon of the same day.

In any case, the results of CAD tests are provided before the next oral test; timetable of the oral tests (exactly as that of the CAD test) are at disposal of the Student in web site of Almaesami [https://almaesami.unibo.it/almaesami/welcome.htm] ; As reported in Regolamento del Corso e dell'Esame,  positive results to the CAD test are considered valid until the autumnal session of the same solar year of frequency (that is, before the beginning of the next cycle of lessons), so Students, which succed in CAD test, can afford oral test in every session until the autumnal session of the same solar year (included).

As reported in the document Regolamento del Corso e degli Esami, lack of frequency to CAD laboratories implies for the Students a further individual CAD test.

Minimum number of hours to validate frequency depends on laboratory timetable pertaining to the specific academic year and it is specified, at the beginning of the course, by the Teacher who holds classes in the Laboratory module.

b) Oral test consists of some questions concerning the topics covered in the program, which, of course, involve the execution of drawings; the exact number of the questions depends on results of CAD test and the value of the drawings performed at home and in laboratory during the year, which the Student must take with him at the oral test (CAD drawings must be brought in a printed version). Global score depends on answers to the oral tests, value of the drawings performed during the year, score obtained in the CAD test.

IMPORTANT NOTES

Results of the CAD test can be found inside web site: https://iol.unibo.it/ .

As a concluding remarks, during written session, Student can take all the books, notes, drawings, useful to perform the test. Obviously, no web or phone connections are allowed.

During oral session Student must hold with him all the tools to perform drawings and all the drawings (CAD drawings in a printed version) performed during the year.

Teaching tools

Slides, models for drawings to be performed during laboratory sessions and other information can be found on IOL.

In the same web site there are examples of former exam questions.

Office hours

See the website of Leonardo Frizziero

See the website of Roberto Valmori