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Computer Aided Technical Drawing

Objectives

- To draw the orthogonal projections of a given part, using the European Method.

- To choose the cutting planes and section planes, necessary for a perfect understanding of the parts. To recognize the drawing elements that must not be cut.

- To know how to draw the most common connection elements and their conventional representations.

- To do the dimensioning of the drawing, representing the main, the secondary and the position dimensions.

- Apply all previous knowledge using a CAD tool.

- To buid a 3D model from the orthogonal projections of a given part, using a CAD tool.

General characterization

Code

10413

Credits

3.0

Responsible teacher

Guilherme António Rodrigues Lavareda

Hours

Weekly - 3

Total - 36

Teaching language

Português

Prerequisites

Basic knowledge of drawing and geometry.

Basic knowledge of the Microsoft Windows 10 or 11 operative systems.

Bibliography

MAIN:
 •   L. Veiga da Cunha, "Desenho Técnico", 17ª Edição, Fundação Calouste Gulbenkian (2017).

 COMPLEMENTARY:
    • Arlindo Silva, João Dias e Luís Sousa, "Desenho Técnico Moderno", 11ª Edição, Lidel (2011).
    • Tutorial Books, "NanoCAD 5.0 Basics Tutorial", Draft2digital (2021).

Teaching method

Part I - Initial part of the lesson with exposition of the subjects unsing examples drawn on the blackboard. Final part with execution of a drawing by the students where they apply the knowledge acquired in the lesson''''s initial part.

Part II - Initial part of the lesson with introduction to the subjects  using specialized software and a projector. Final part with execution of a drawing in computer by the students where they apply the knowledge acquired in the previous part.

Evaluation method

Evaluation Method

 

a) Continuous Assessment (CA):

   - 2 tests (T1, T2).

   - exam exemption:

        Test grade average (MT) greater than 9.5.

 

b) Final Exam (E)

 

Final Score (NF):

   - With exam exemption: MT.

   - Without exam exemption: E.

 

 

Final notes:

In any evaluation test (within CA or E), a complementary oral test may be required by teachers to clarify students´ knowledge or defend a grade.

 

Subject matter

PART 1 – BASIC TECHNICAL DRAWING

  • Introduction. Technical pencils and pens. Types and thicknesses of lines used in Technical Drawing. NP standards.
  • Orthogonal Projections. ISO and ANSI standards. Choice of necessary and sufficient views.
  • Representation of Cuts and Sections. Cut types. Cuts in conventional representation and elements that are not cut lengthwise.
  • Dimensioning: dimension types and their location. Tolerances.
  • Drawing of Connecting Elements. Representation of threaded parts. Thread types. Screws, nuts, washers and  feather keys. Dimensioning of connecting elements.


PART 2 – COMPUTER-AIDED DRAWING (CAD):

  • Basic tools and initial definitions of 2D CAD.
  • Two-dimensional drawing commands. Entity design and modification. Entity grouping (blocks). Drawing aid tools.
  • Drawing method in two-dimensional CAD.
  • Insertion of hatches and dimensioning.
  • Introduction to three-dimensional models and shapes. Coordinate systems.