034042 – Introduction to Engineering Drawing

Introduction to Engineering Drawing – 034042

 

Lecture Subjects:

1) Introduction to engineering drawing as the language of mechanical engineering.

2) To teach how to draw simple mechanical elements and to enable the engineer to sketch manually and with the help of instruments.

3) To enable the reading of mechanical drawings.

4) To provide a theoretical basis for computer-aided draughting.

 

The course covers selected, basic subjects of descriptive geometry and engineering drawing. The aim of descriptive geometry is the two-dimensional description of three-dimensional objects in a way that enables the recovery of form and dimensions. The engineering drawing inherits this aim and adds the requirement that the drawing shall enable the production of the drawn object with satisfying precision and in accordance with relevant standards and regulations. The engineering drawing is a language and, as each language, has a dictionary, a grammar and styles.

The dictionary and the grammar are defined by standards. The State of Israel has its own standards based on the international ISO standards. The style of drawing depends on personal experience and abilities.

 

Week Lecture Exercise
1 ·         About this course.

·         Drawing instruments.

·         How we see the world.

·         Central projection, parallel projection, orthographic projection.

·         Standard drawing formats and scales.

Geometrical constructions in plane.

Monge’s method, projections of 3D bodies on three projection planes.

2 Monge’s projections on two planes. The point in four quadrants. –First angle view. Third angle view. This course uses the first-angle view.

The projections of the straight line. Parallel lines, lines parallel to projection planes, intersecting lines. When is necessary a third projection. True length.

Points in space. Completing a 3rd projection based on two given projections. True length of line segment (TS).
3 Defining a plane. Special planes. Points and particular lines in the plane. Perpendicular on plane. The traces of a plane. The common tangent of two circles. Relationships between point and plane. Perpendicular on plane. Constructing a line segment of given length.
4 The cube – projections, sections and development.

Introduction to dimensioning

Relationships between lines and planes, and between planes. Cube development.
5 The pyramid – projections, sections, development.

Dimensioning 2.

Development of pyramid.
6 Axonometric projection. The law of scales. Dimetric and trimetric projections. Recommendations for isometric projections. Isometric views.

Using a caliper for measurement.

Basic dimensioning.

7 The cylinder – projections, sections, development.

The influence of dimensioning on tolerances

Development of cylinder.
8 The helix – definitions, projections, equation, development, slope angle.

Midterm examination

Resulting dimensions and alternative dimensions in linear chains.
9 The cone – projections, sections, development. The development of the cone.

Detail drawings, assemblies.

10 Screws, bolts and nuts.

Tolerances of form.

Screws.

Geometric tolerances 1: form and orientation.

11 Drawing gears.

Surface roughness.

Geometric tolerances 2: positioning.
12 The sphere – projection, sections.

Conclusion on developable surfaces.

Geometric tolerances 3: analysis in assemblies.
13 Assembly drawing – contents.

Course conclusions, synthesis, comments on the continuation of learning.

Review.

 

The components of grades.

With midterm examination and if the midterm grade is higher than that of the final-exam grade: 60% exam + 10% midterm + 30% homework.

Without midterm examination, or if the midterm grade is lower than the final-exam grade: 70% exam + 30% homework.

 

Contact Hours per Week

Lecture: 2 hours

Recitation: 2 hour

Credit points: 3