General information

Subject type: Basic

Coordinator: Joan Triadó Aymerich

Trimester: First term

Credits: 6

Teaching staff: 

Pablo Alberto Genovese
Pablo Alberto Genovese 
Pedro Casariego Vales 

Teaching languages

  • Spanish


Specific skills
  • CE5: To train for the spatial vision and the knowledge of the techniques of graphic representation, so much by traditional methods of metric geometry and descriptive geometry, as by means of the applications of design assisted by computer.


The purpose of Graphic Expression is to train students to be able to identify, interpret and use graphic representations in the fields of Engineering. Taking into account the industrial regulations of graphic representation techniques.

This course provides the essential basis for supporting graphic representation throughout the career.


Generally the contents of the subject of Graphic Expression can be grouped in:

  1. Fundamentals and techniques of graphic representation
  2. Spatial design
  3. Industrial standardization
  4. Representation and interpretation of industrial and architectural plans
  5. Computer assisted applications

Specifically, the contents of the subject of Graphic Expression are the following:

Topic 1 - Dihedral System

  • Dihedral System. definition
  • What is a Projection
  • Dihedral views
  •  2D presentation of the Side view
  • European System and American System
  • Economy of Views
  • Axonometric system

Topic 2 - Graphical expression and normalization

  • Need for graphics in engineering
  • normalization
  • Types of drawings in engineering
  • Technical vocabulary
  • Standardization of plans

Topic 3 - Cuts and sections

  • Purpose of cuts and sections
  • Procedure to generate a cut
  • Differences between cut and section
  • Rules for representing cuts and sections
  • Type of cut
  • Cross sections
  • Elements that cannot be sectioned longitudinally

Topic 4 - Dimension

  • Functional, non-functional and auxiliary dimensions
  • General principles of dimensioning
  • Elements of a dimension
  • Dimensioning of circular elements
  • Provision of the quotas
  • Simplified dimensioning of symmetrical parts
  • Dimensioning of repeated features
  • Dimensioning of conical, pyramidal and inclined surfaces
  • Particular cases of limitation

Topic 5 - Dimensional tolerances

  • Introduction
  • Dimensional tolerances
    • Definition
    • Representation of tolerances
    • Quality tolerances
    • Position of the tolerance zone
  • adjustments
    • Representation of adjustments
    • ISO adjustment systems
  • General dimensional tolerances
  • Verification of dimensional tolerances

Topic 6 - Geometric tolerances

  • Introduction
  • symbols
  • Indications in the drawings
    • Theoretically exact dimensions
    • Tolerance rectangle
    • References and reference elements
    • Multiple references
    • Associated items
    • Application to partial lengths of elements
    • Individual zones with the same tolerance
    • Indication of "Common Area"
    • Projected tolerance zone
    • Partial references
  • Examples of geometric tolerances
  • General geometric tolerances

Topic 7 - surface states

  • Introduction
  • Symbols used in plans
  • Indication of surface roughness
  • Indications of the special characteristics of the State of the surface
  • Indications in the drawings

Topic 8 - Threaded Unions

  • Introduction
  • Characteristics of a thread. Definitions
  • Types of thread profiles
  • Conventional representation and dimensions of the threads
  • Snails
  • Females
  • bolts
  • Asparagus
  • Washers
  • Pins
  • Immobilization of screws and nuts
  • Qualities of screw materials

Topic 9 - Detachable and Non-Detachable Unions

    • Elastic rings
    • Chavetas
    • rivets
    • Welding

Topic 10 - Transmission Elements 1 -  gears

  • Types of gears
  • Profile the tooth
  • Gear elements
  • Calculation of straight tooth gears
  • Representation of cylindrical gears
  • Helical gears
  • Live without end crown
  • Representation of crown worm gears

Topic 11 - Transmission Elements 2 -  Other transmission elements

  • Belt transmission
  • Transmission by chains
  • Shafts and axles
  • couplings
  • Cardan joint

Topic 12 - bearings

  • Definition of bearing
  • Bearing type
  • Simplified representation
  • Bearing fixing systems
  • lubrication abrasive and non-abrasive fillings

Topic 13 - Preferred Numbers

  • Definition of preferred numbers
  • Basic series and derivative series

Evaluation system

The subject is taught throughout the 3 terms of the course (annual subject), but is divided into two modules. The 1st module covers the 1st trimester, and the 2nd module covers the 2nd and 3rd trimesters.

The evaluation of the 1st module is carried out through a face-to-face exam with a value of 100% on the final grade of the 1st module (NM1). The exam will consist of a theoretical and practical part. The student will be able to retake this first module before starting the second module in case of failure.

Practice days will be focused on solving practical exercises and theoretical quizzes. The aim is to acquire the necessary tools for correct monitoring of the 2nd Module. The solution to these will be posted on the intranet once all the groups in the subject have done the current practice.

The teacher reserves the right to evaluate 2-3 practices out of the 5 to be completed during the first module. These practices will have a value of 30% on the final grade and, therefore, the final exam 70%.

The Note of the 2nd Module (N2M) is obtained:

N2M = 0,1 · AA2T + 0,3 · AA3T + 0,2 · AAP2T + 0,4 · AAP3T

  • Assessable activity/s of the 2nd term (AA2T), carried out in the Practice Groups and during the class period of the 2nd term.
  • Evaluable activity/s of the 3rd term (AA3T), carried out in the Practice Groups and during the class period of the 3rd term.
  • Partial Assessable Activity 2nd term (AAP2T), carried out in the period of final exams of the 2nd term.
  • Partial Evaluable Activity 3rd Quarter (AAF3T), carried out during the period of final exams of the 3rd quarter.

The condition for delivering each evaluable activity is to have attended the corresponding session.

In order to pass the subject, a minimum mark of 4 (four) is established in the qualification of each of the modules.

The recovery of the modules (1st and 2nd) is carried out in the period of the recovery exams of the 3rd quarter.

The Final Grade (NF) of the subject is obtained by weighting the grade of each of the modules as follows:

NF = 0,33 · N1M + 0,66 N2M



Preciado Barrena, Cándido and Moral García, Francisco Jesús. 2006. Standardization of Technical Drawing. San Sebastián: Donostiarra. ISBN: 9788470633096.

Félez Mindán, Jesús and Martínez, María Luisa. 2008. Graphic Engineering and Design. Madrid: Synthesis; Collection: Synthesis engineering. ISBN: 8497564995.

Ruiz Vassallo, Francisco. 2005. Electrical and Electronic Schematics. Reading and Interpretation. Ed. Copyright creations. ISBN: 84-96300-02-1