Ability to interpret technical drawings, understanding shape, dimensions, tolerances, surface finish. Ability to draw simple assemblies and to extract constructive drawings of the relevant parts.
– To acquire the basic knowledge of the graphic representation of machine parts.
– To known the standards (ISO, EN, UNI) pertaining to technical design.
– To learn the fundamental principles for suitable dimensioning and tolerancing of technical drawings.
– To know the norms pertaining to geometrical tolerancing and indication of the surface texture parameters.
– To know the most common standard machine elements, their conventional drawing and their usage.
– To achieve the technical ability to interpret technical drawing of assemblies and to extract constructive drawings of the relevant parts.
– To achieve a basic ability to use a 2D CAD program.
The course is made up of lessons (24 hours) and practice (48 hours) in a specialized hall.
Students are expected to draw 6÷8 projects related to the topics dealt with in the course (orthographic representation, design of machine parts, views and cuts of assemblies). Drawing is carried out partly by traditional means, partly with the aid of a 2D CAD program (Microstation®); works are usually corrected and rated by teachers.
– Introduction
Standards; main national and international standardization organizations. Scales; lettering; sizes and layout of drawing sheets; title block. Conventions for lines. Drawing tools.
– Representation of solids
Projection methods. Orthographic representation. Intersections of solids.
– Conventional graphic representation
Views and cuts; basic conventions. Shortcuts and other conventions. Assemblies.
– Dimensioning
Fundamental principles. Dimension and extension lines; positioning of dimensions; arrangement of dimensions; choice of datums. Levels
– Tolerances and surface texture
Dimensional tolerances; fits; ISO code system; hole-base and shaft-base fit systems. General tolerances. Geometrical and positional tolerances. Conventional indication of surface texture parameters.
– Screw threads
Outline. Types of screw threads: metric, Whitworth, trapezoidal; parallel and tapered pipe threads. Conventional representation of threaded elements.
– Fasteners (Temporary joints)
Bolts screws, studs, nuts. Split pins, plain washers, spring washers, tab washers. Pins. Keys; splines.
– Steady joints
Interference fits. Welded, brazed and soldered joints: techniques (brief outline); symbolic representation. Rivets and fasteners.
– Bearings
Plain bearings; bushings (brief outline). Rolling bearings: radial, thrust, angular contact, tapered, self-aligning.
– Toothed gears
Conventional representation and dimensioning of cylindrical and tapered gears.
– Materials
Mechanical properties of materials (brief outline). Standard designation of steels, cast iron, copper alloys, aluminum alloys. Brief outline of the technology of metals.
Chirone, Tornincasa; Disegno Tecnico Industriale, Vol. I-II; Il Capitello Torino.
Straneo, Consorti; Disegno, Progettazione e Organizzazione Industriale, Vol. II; Ed. Principato.
Other didactic stuff produced by teachers.
BRUNO PICCIGALLO (President)
MARCO VEZZANI (President)
Examinations are both written and oral.
The written test (6 hours) comprises a questionnaire aimed to verify the knowledge of relevant norms, the drawing of a view or section of a simple assembly and the drawing of a machine part, complete of dimensions and tolerances.
A sufficient mark for the written test is required to access the oral exam.
The oral exam consists in a discussion on the topics dealt with in the course and in an exercise of drawing with a CAD program.
