CHAPTER 1 Introduction to Engineering Drawing Standards Drawing

CHAPTER 1 Introduction to Engineering Drawing Standards

Drawing standard

Drawing standard Drawing Sheet

Minimum character height for sheet size CHARACTER HEIGHT (h), mm SHEET SIZE A 0, B 1 A 1, A 2, A 3, A 4, B 2, B 3, B 4 Titles and drawing numbers 7 5 Subtitles, headings, view and section designations 5 3. 5 2. 5 USAGE (UPPER CASE ONLY) General notes, material lists, dimensions

Drawing standard Drawing Scale

Drawing standard Lettering

Drawing standard Line Types

Arrow Size and Types O Arrow – a symbol placed at the end of dimension lines to show the limit. O Arrows are uniform in size and style, regardless of the size of drawing

Using drawing tools

Geometrical Construction Used in Engineering Drawing

Constructing an Angle 30, 45, 60 and 90 degrees. O Construct an angle 30 degrees O Construct an angle 45 degrees O Construct an angle 60 degrees O Construct an angle 90 degrees O To bisect a given angle

Constructing a poligon

Construct an Ellipse O To draw an ellipse by: O The concentric circles method, given major and minor axes. O The rectangular method.

Construct a Tangent Drawing an Arc Tangent to Two Lines at Acute or Obtuse Angles O Given two intersecting lines not making a 90º angle and the distance (R) O Draw lines parallel to the given lines at a distance (R) from them to intersect at point (C). O With (C) as the center and with the given radius (R) draw the required tangent arcs between the given lines.

Your homework O Drawing No 1 O Drawing No 2 O Follow the steps given previously O All must be drawn again to your drawing paper except THE MARKS. O Submit during your next class.