The basic language of all engineering activities is represented, in the majority of cases, by design processes that involve the engineer in two distinct activities: modeling and communication. In areas such as systems design and analysis, industrial plants and processes, which are typical fields of automotive engineering, the engineer uses technical drawings in order to identify construction solutions, carry out design calculations, and perform a technical-economic comparative analysis of the various solutions. In this sense, technical drawing is not merely a graphical exercise, but becomes a synthesis of the engineer's expertise about a product which must respect economic, manufacturing and functional specifications.
Today technical design is a document to communicate, in a complete, precise, unambiguous and rigorous way, all information of an industrial component with the main objective of its manufacturing.

The student will be expected to acquire the ability to representing and dimensioning the most common industrial components, taking into account their functional and manufacturing requirements. as well as interpreting unambiguously and correctly drawings of parts and assemblies.
The module therefore intends to provide undergraduate engineers the knowledge and methodologies necessary for components modeling and graphic description, in accordance to national and international Standards.

Basic principles of orthographic representations.

INTRODUCTION TO TECHNICAL DRAWING:
The drawing as a graphic language for the communication of technical information. Placing of the design phase in the product life-cycle management. The digital prototype. Standardization and unification within the technical design: scale, sheet formats, linework, lettering and graphic symbols.
ORTHOGRAPHIC PROJECTIONS AND SECTIONS:
The orthographic projections of solids and their interpenetration. The sections and standards of representation. Axonometric projections.
DIMENSIONING AND REPRESENTATION OF ERRORS:
Functional and technological dimensioning. Dimensions schemes and related standards. The dimensioning systems. Dimensional tolerances. Tolerances according to ISO. Hole-basis and shaft-basis engineering fits. Surface texture, roughness and graphic symbols in drawings. Tolerance chain stack up analysis. Geometric tolerances. Prescription, choice of datum.
FASTENERS AND MECHANICAL COUPLINGS:
Screw threads: definitions. Threads standards, related conventional representation and dimensioning. Screws, bolts, threaded nuts and self-locking devices. Shaft-hub connections. Keys, keyways and splined shafts. Pins, elastic rings. Representation of bearings, belts, pulleys and gears.

The course consists of lectures and practices. The practices consist of graphical representation (in manual traditional way and through 2D and 3D parametric CAD software) in isometric and orthographic projection of parts or assemblies presented individually, or extracted from mechanical systems. The components must be represented in the most appropriate views and sectional views, indicating dimensions, dimensional and geometric tolerances and surface roughness. Clearance and interference cases must also be calculated by means of tolerance chain stack up analysis. Functional dimensioning method is suggested. Three-dimensional models must be modelled and assembled with appropriate mates relationships. Through CAD software 2D drawings of parts and bill of materials must be obtained.

E. Chirone, S. Tornincasa, Disegno Tecnico Industriale, vol. I e II, Ed. Il Capitello, Torino.
S. Tornincasa, A. Zompě, E. Vezzetti, S. Moos: Quotatura funzionale degli organi di macchine, Ed. CLUT, Torino.

The exam consists of a graphical test, an oral test (optional if the test is properly performed with a graphic rating greater than or equal to 24/30) and an assessment of the practices (drawings) carried out during the course. At the oral examination will be admitted only students who have achieved a score of at least 18/30 in the written part.
In the absence of 80% of practices delivered on time, the student is not granted the certificate of attendance.