Engineering design

W3-1

Professor: Oscar Alonso Rosete Beas

Previous session

  • Introduction to drawing standards

  • Introducing the title block

  • Portfolio drafts(3,4,5)

Agenda

 

  • Drawing terminology
  • Bisecting lines
  • Portfolio draft (5)

Laboratory sessions

CAT´S LAB A

First activity

Second activity

Third activity

Portfolio draft (4)

Drawing terminology

A particular size sheet with a drawing border is called a layout.
Regardless of whether you draw by hand or use CAD or 3D modeling methods, you need to plan your sheet so that the information will fit and show clearly.

A point is used to represent a location in space but has no width, height, or depth. A point in a drawing is represented by the intersection of two lines (a), by a short crossbar on a line (b), or by a small cross (c). Do not represent points by simple dots on the paper. This makes the drawing look “blobby” and is not as accurate.

Drawing terminology

Edge of a solid is formed where two surfaces intersect.

Vertex (plural, vertices) of a solid is formed where three or more surfaces intersect. The end of an edge is a vertex.

Lines are used in drawings to represent the edge of a solid object. 

 

Drawing terminology

Alphabet of lines

We have only used visible lines (HB) for the frame and construction lines (2H) to find the centerof the layout and for the 1 cm divisions.

Bisecting horizontal or vertical lines

Sketch 45 degree lines from starting and ending point (A and B) to locate C point

Draw a vertical line across C tolocate the center D

Draw a horizontal line across C

Sketch 45 degree lines from starting points A and B

AB center

Center

Given line

Bisecting any line or circular arc

Divide a line in equal parts

Divide a line in equal parts

If you use uniform divisions for the previous steps you will get equal parts. Examples of practical applications are shown

 

An angle is formed by two intersecting lines. A common symbol for angle is .

A degree is divided into 60 minutes (60'), and a minute is divided into 60 seconds (60"). The angle value 37°26'10"  is read 37 degrees, 26 minutes, and 10 seconds.

Drawing terminology

 

Given angle BAC to be bisected

Bisecting an angle

A circle is a closed curve with all points on the circle at the same distance from the center point. the major components of a circle are the diameter, the radius, and the circumference.

  • The diameter is the straight distance from one outside curved surface through the center point to the opposite outside curved surface
  • The radius is the distance from the center point to the outside curved surface.
  • The circumference is the distance around the outer surface.

Circle

Reference

Portfolio draft (6)

Units expressed in meters

Activity description:

On a letter size blank sheet of paper in landscape orientation, after adding the 1 cm frame and the respective title block, add Section 1 as seen on the image.

Title block:

  • Title: Sixth draft, Created by: your name, Approved by: professor name, Date of issue: Today, Document type: Draft, Legal Owner: CETYS

Section 1:

Make 4 cm divisions and sketch 4 cm circles

with concentric 2 cm circles

Section 1

Title block

Section 2

Section 2:  sketch 2 8 cm circles with decreasing concentric circles every 1 cm.

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