COMPUTER AIDED DRAWING

iten
Code
56649
ACADEMIC YEAR
2021/2022
CREDITS
6 credits during the 1st year of 8716 Electrical Engineering (L-9) GENOVA

6 credits during the 1st year of 10375 CHEMICAL AND PROCESSES ENGINEERING (L-9) GENOVA

SCIENTIFIC DISCIPLINARY SECTOR
ING-IND/15
LANGUAGE
Italian
TEACHING LOCATION
GENOVA (Electrical Engineering)
semester
1° Semester
Teaching materials

OVERVIEW

The course is about technical drawing assisted by a computer and related standards.

AIMS AND CONTENT

LEARNING OUTCOMES

The course provides the basic knowledge, according to ISO standards, for the correct interpretation and understanding of technical drawings and for drafting, using a CAD software, mechanical components with geometry description and all further information (tolerances, processes, materials, etc.) necessary for their implementation (tolerances, processes, materials, etc.).

AIMS AND LEARNING OUTCOMES

The purpose of the teaching is to introduce the student to the industrial drawing which is a universal visual language that conveys the way something works or how it is built. It will be explained that technical drawings may include two-dimensional (orthogonal) plans, sections and elevations or may include three-dimensional or exploded projections. They can be drawn to scale by hand or prepared using CAD (Computer Aided Design) software. To convey the precise meaning of the information, it will be clarified that technical drawings include dimensions, annotations and symbols which, to ensure their concise and unambiguous meaning, must be consistent with industry standards; furthermore, information on technical specifications included in technical drawings should never be duplicated as this can become contradictory and confusing.

Attendance to lectures, participation in computer classroom activities and individual study will allow the student to:
• learn the general aspects of the design
• acquire the technical terminology used in the design
• master the methods of representing real objects through orthogonal projections and with the use of sections according to the European ISO method
• correctly indicate the dimensions, dimensional tolerances and geometric and microgeometric tolerances
• knowing how to express couplings between pieces with clearance or interference in the shaft basis or hole basis system, identifying the correct position and tolerance class
• know and master the CAD tools for the creation of graphic primitives, their manipulation and modification and for the designation of dimensions, tolerances and machining
• create two-dimensional A4 tables with a CAD software in which mechanical parts are represented with the technical specifications necessary for their manufacturing

 

PREREQUISITES

None.

TEACHING METHODS

The course consists of lectures and exercises in the computer room.
The lessons introduce the UNI ISO standard for the representation of objects in an unambiguous manner and the indication of dimensions, dimensional, geometric and microgeometric tolerances. Furthermore, they present the terminology and basic rules for industrial technical drawing with the appropriate symbology to indicate threads, gear wheels, bearings, etc. The principle of maximum material and the need for envelope are also illustrated as exceptions to the principle of independence between dimensional and geometric tolerances.
The exercises are meant to explain the commands of a CAD software for the creation of A4 drawings in which a mechanical paty is represented according to the European orthogonal projections method. In order to facilitate the learning of the representation methods of 2D drawings on the computer, the students, who can work in pairs, are assigned themes that they develop independently. The idea is to exploit the techniques of learn by doing and learn by trial and error. The teacher guides and assists the students without interfering with their reasoning and about half an hour before the end of the exercise asks students who wish to show their work to the whole class so that errors are highlighted and corrected in real time.

SYLLABUS/CONTENT

Standardisation: international and national standards. Standard for technical drawing. Drawing types. Shape and size representation of a mechanical part: the graphic model. Hand-made sketches. Orthogonal projections, sections, dimensioning (complying the ISO standards). Overview on axonometric and slanted views. Summary on basic mechanical components.

Manufacturing tolerancing: dimensional, geometrical, surface tolerancing.

Non-permanent joining parts (threaded items, centering elements) and stable joining parts.

Guidelines on the elements shape depending on the manufacturing process and the material used.

Computer graphics. The digital mock-up. 2D modeling. Details on the SW for technical graphics. Rastering and vectoring of manual drafts. 

RECOMMENDED READING/BIBLIOGRAPHY

A. Chirone, S. Tornincasa, “Disegno tecnico industriale”, vol. 1 e 2.

Additional documents are available on Aulaweb.

TEACHERS AND EXAM BOARD

Office hours: The teacher is available for the students at the end of each lesson or via a MS Teams meeting.

Exam Board

ROBERTO RAZZOLI (President)

CARLA PAMPALONI

PAOLO SILVESTRI

MARGHERITA MONTI (President Substitute)

LESSONS

TEACHING METHODS

The course consists of lectures and exercises in the computer room.
The lessons introduce the UNI ISO standard for the representation of objects in an unambiguous manner and the indication of dimensions, dimensional, geometric and microgeometric tolerances. Furthermore, they present the terminology and basic rules for industrial technical drawing with the appropriate symbology to indicate threads, gear wheels, bearings, etc. The principle of maximum material and the need for envelope are also illustrated as exceptions to the principle of independence between dimensional and geometric tolerances.
The exercises are meant to explain the commands of a CAD software for the creation of A4 drawings in which a mechanical paty is represented according to the European orthogonal projections method. In order to facilitate the learning of the representation methods of 2D drawings on the computer, the students, who can work in pairs, are assigned themes that they develop independently. The idea is to exploit the techniques of learn by doing and learn by trial and error. The teacher guides and assists the students without interfering with their reasoning and about half an hour before the end of the exercise asks students who wish to show their work to the whole class so that errors are highlighted and corrected in real time.

Class schedule

All class schedules are posted on the EasyAcademy portal.

EXAMS

EXAM DESCRIPTION

The exam is divided into 2 tests:

A graphical computer test, which involves the execution of a constructive design using the 2D CAD MICROSTATION v8i. The graphic test takes place in the computer room (duration of the test: 2 hours) and the result of the test must be ≥ 18/30.
An oral test, which includes an assessment of the theoretical knowledge indicated in the course program.
N.B. The written test, if sufficient, is valid for the whole solar year. The oral exam can be taken in any official appeal.

Application for the graphic test

It is mandatory to book using the online mode (from the University portal services to students), AT LEAST 5 DAYS BEFORE the start of the test.
Given the limited capacity of the computer lab, one group is planned in the morning and a second one in the afternoon. These groups foresee a max. of 35 people.
If the total number exceeds 70, a further date will be set.
Within the assigned term, the drawing must be printed and the file copied to the Classroom - Delivery Unit folder.
It is possible to consult books and / or manuals.
The results will be announced on Aulaweb.
The oral examination if not passed (or rejected) does not cancel the written test. The positive results obtained in the graphic tests are valid for the whole exam session (calendar year).
The final grade is the average of the oral test and written test score.

Further information:

Files containing the sheet squaring for A4 and A3 formats and the Microstation seed file settings are available on Aulaweb.
Upon delivery of the written test, the evaluation of any previous test is lost.


Registration for the oral test

After the publication of the results of the written test it is possible to register for the oral exam, using the web-based booking tool. Each student enrolled in the forum will receive an email alert, with the day and time of the oral test.

ASSESSMENT METHODS

The examination procedures, its preparation and the degree of deepining of each topic will be illustrated during the lessons and reported on Aulaweb.

The written examination consists in the realization of a 2D table with dimensions and tolerances of a mechanical part of which a three-dimensional representation is provided. The student must be able to represent the proposed object unambiguously, maintaining its proportions, according to the European method of orthogonal projections; must provide the minimum number of views necessary to guarantee the workable realization of the piece; he or she will have to arrange the dimensions in sufficient and not redundant manner and to indicate the tolerances according to the required specifications in the examination text. He or she must be able to use the appropriate styles and line weights; must be able to designate a coupling in the hole-basis or shaft-basis system.

 

The oral examination will focus on the topics covered during the lectures and have the purpose of assessing not only if the student has reached an adequate level of knowledge, but also if he or she has acquired the ability to deal with logical problems that will be posed during the exam.

The student will be asked to illustrate theories and solve problems: in relation to these it will be evaluated the clarity of exposition, the appropriateness of the used  terminology and the methodological approach oriented to manufacturability, interpreting and formulating prescriptions and principles related to the description of parts in a unique, unambiguous and not redundant way.

Exam schedule

Date Time Location Type Notes
12/01/2022 09:00 GENOVA Scritto
09/02/2022 09:00 GENOVA Scritto
09/06/2022 09:00 GENOVA Scritto
21/07/2022 09:00 GENOVA Scritto
13/09/2022 09:00 GENOVA Scritto