Engineering design

W4-2

Professor: Oscar Alonso Rosete Beas

Previous session

• Circles

• Portfolio drafts (6,7)

Agenda

• Drawing terminology
• Portfolio revision on Wednesday(1-7)
  • ​Study guide will be presented
• Exam Monday, February 17
• Portfolio draft (7,8)

Laboratory sessions

CAT´S LAB A

First activity

Second activity

Third activity

Portfolio draft (4)

Portfolio draft (5)

1

2

3

4

5

6

7

8

title block

Portfolio draft (6)

Portfolio draft (7)

Units expressed in inches

square

Terminology

Tangents
Straight or curved lines are tangent to a circle or arc when the
line touches the circle or arc at only one point.

Section 1

Title block

A line tangent to a circle. The point of tangency is found by constructing a line from the center of the circle 90° to the tangent line.

A line tangent to an arc. The point of tangency is found by constructing a line from the center of the arc 90° to thetangent line.

Terminology

Tangents
Straight or curved lines are tangent to a circle or arc when the
line touches the circle or arc at only one point.

Title block

Two tangent circles. A line drawn between the circles centers establishes the point of tangency where the line intersects the circles.

A  common application in an engineering drawing where an arc is drawn to form a radius 90° corner

Tangent to two circles

1. Given two circles with centers marked C1 and C2, draw a vertical line that touch the circumference and the center.
2. Connect them from the points that touch the circumference on the circles.

Points of tangency

Points of tangency

Portfolio draft (8)

Portfolio draft (8)

Activity description:

Same proccedure seen on porttfolio draft 7

Title block:

• Title: Pivot arm

Section 1:

Draw the metallic plate as seen on the following image

Notes:

• Make the draft multiplying quantities by 2.
• Units expressed in cm
• Left circle is 3 inches from the left of the centerpoint and vertically centered.

Portfolio draft (8b)

Activity description:

Same proccedure seen on porttfolio draft 7

Title block:

• Title: metallic plate (2)

Section 1:

Draw the metallic plate as seen on the following image

Section 1

Title block