Engineering design
W3-1
Professor: Oscar Alonso Rosete Beas
![](https://media0.giphy.com/media/ecdtCGfJSNjjy/giphy.gif)
Previous session
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Introduction to drawing standards
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Introducing the title block
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Portfolio drafts(3,4,5)
Agenda
- Drawing terminology
- Bisecting lines
- Portfolio draft (5)
Laboratory sessions
CAT´S LAB A
![](https://s3.amazonaws.com/media-p.slid.es/uploads/1166142/images/6987846/pasted-from-clipboard.png)
First activity
![](https://s3.amazonaws.com/media-p.slid.es/uploads/1166142/images/6985915/pasted-from-clipboard.png)
Second activity
![](https://s3.amazonaws.com/media-p.slid.es/uploads/1166142/images/6985917/pasted-from-clipboard.png)
Third activity
Portfolio draft (4)
![](https://s3.amazonaws.com/media-p.slid.es/uploads/1166142/images/6985926/pasted-from-clipboard.png)
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.
![](https://s3.amazonaws.com/media-p.slid.es/uploads/1166142/images/7006735/pasted-from-clipboard.png)
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.
![](https://s3.amazonaws.com/media-p.slid.es/uploads/1166142/images/7006231/pasted-from-clipboard.png)
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
![](https://s3.amazonaws.com/media-p.slid.es/uploads/1166142/images/7006233/pasted-from-clipboard.png)
Alphabet of lines
![](https://s3.amazonaws.com/media-p.slid.es/uploads/1166142/images/7006245/pasted-from-clipboard.png)
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
![](https://s3.amazonaws.com/media-p.slid.es/uploads/1166142/images/7006278/pasted-from-clipboard.png)
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
![](https://s3.amazonaws.com/media-p.slid.es/uploads/1166142/images/7006276/pasted-from-clipboard.png)
Divide a line in equal parts
![](https://s3.amazonaws.com/media-p.slid.es/uploads/1166142/images/7006263/pasted-from-clipboard.png)
![](https://s3.amazonaws.com/media-p.slid.es/uploads/1166142/images/7006263/pasted-from-clipboard.png)
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
![](https://s3.amazonaws.com/media-p.slid.es/uploads/1166142/images/7006262/pasted-from-clipboard.png)
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.
![](https://s3.amazonaws.com/media-p.slid.es/uploads/1166142/images/7006240/pasted-from-clipboard.png)
![](https://s3.amazonaws.com/media-p.slid.es/uploads/1166142/images/7006241/pasted-from-clipboard.png)
Drawing terminology
Given angle BAC to be bisected
Bisecting an angle
![](https://s3.amazonaws.com/media-p.slid.es/uploads/1166142/images/7006273/pasted-from-clipboard.png)
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
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
![](https://s3.amazonaws.com/media-p.slid.es/uploads/1166142/images/7022925/pasted-from-clipboard.png)
Section 1
Title block
Section 2
Section 2: sketch 2 8 cm circles with decreasing concentric circles every 1 cm.
Copy of Technical Drawing W3-1
By oscaralonso11
Copy of Technical Drawing W3-1
- 168