Engineering Drawning & Graphics-Introduction,types &other information-Lecture 1-By Engr Zohaib Ali...

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Engr. Zuhaib Ali KhanUniversity of Engineering and TechnologyPeshawar Pakistanengr_zuhaib@nwfpuet.edu.pkengr_zuhaib@yahoo.comOffice Location : Fuel Lab Mechanical

Engineering Department

Mechanical Engineering Department Spring 2015

ENGINEERING DRAWING & GRAPHICS

ME-105 (Th)

ENGINERING DRAWING & GRAPHICS

Contact hours: 2

Credit hours: 2

Objective:

To understand basic concepts of Engineering Drawing and its applications in the production of design outputs.

• Text:

a. ‘Elementary Engineering Drawing’, Revised and Enlarged Edition by N. D. Bhatt.

• Reference:

a. ‘Engineering Drawing and Graphic Technology’, 14th Edition by Thomas E. French, Charles J. Vierck and Robert J. Foster.

Grading

Mid-term Exam 25%Final-term Exam 50%Homework Assignments 10%Tests and Quizzes 15%

1. INTRODUCTIOIN TO ENGINEERING DRAWING:

• A language of Engineers to describe

a. Shape

b. Size

c. Fit

d. Finish

e. Production Process and Specification

f. Function

g. Assembly

2. TYPES OF DRAWING:

a. Detail Drawings• To describe the shape, size, fit and finish of each and

every part in detail for production purposes.

b. Sub-Assembly Drawings• To describe the fit and method of fastening for a small

group of components to create an assembly.

c. Assembly Drawings• To describe the fit and method of fastening for a group of

sub-assemblies to create a larger assembly.

PC SUB-ASSEMBLY AND ASSEMBLY DRAWING

PC detail Drawing

3. TYPES OF MEASURING SYSTEMS:

a. English• Feet and Inches

b. Metric• Meters and Millimeters

4. DRAWING INSTUMENTS AND THEIR USES:

a. Drawing BoardServes as a flat drawing surface to attach a paper to.

Drawing board size: Drawing boards are made in various sizes. The selection of Drawing board depends on the size of drawing

paper used. • Standard size of Drawing boards• Designation Size (mm) Designation Size (mm)• B0 1500 × 1000 B3 500 × 350• B1 1000 × 700 B4 250 × 350• B2 700 × 500

b. Drafting Media

• Paper• Film (Tracing Paper)

Standard Sizes are:

USA size, inches Closest International size, mmA (8.5 x 11.0) A4 (210 x 297)B (11.0 x 17.0) A3 (297 x 420)C (17.0 x 22.0) A2 (420 x 594)D (22.0 x 34.0) A1 (594 x 841)E (34.0 x 44.0) A0 (841 x 1189)

c. PencilsClassification according to lead hardness is:

Hard grades Medium grades Soft grades 9H Hardest 3H Hardest 2B Hardest8H 2H 3B7H H 4B6H F 5B5H HB 6B4H Softest B Softest 7B Softest

d. Eraser

e. T SquareFor drawing horizontal lines and provide a supporting/sliding edge for set-squares and other stencils.

f. Set-SquaresFor drawing vertical and angular lines

g. Scalesi. Linear scales (English and Metric)ii. Cardboard scales (For reducing and increasing size)iii. Diagonal scales (For measuring fractions)iv. Protractor (For measurement of angles)

h. Compass with ExtenderFor drawing circles and circular arcs

i. DividerFor transferring measurements and for dividing lines into andy number of equal parts.

Lecture 2

5. TYPES OF LINES USED IN ENGINEERING DRAWING:

a) Visible Outline For showing visible edges of an object

b) Hidden Outline For showing hidden edges of an object

c) Center Line For locating center of circles, arc and ellipses relative to the object.

0.35 mm to 0.5 mm thick

d) Cutting Plane Line To show the location of the imaginary secion plane in the reference view.

2 to 2.5 mm 1 to 1.5 mm

15 to 20 mm 1 to 1.5 mm2 to 2.5 mm

15 to 20 mm 2 to 2.5 mm1 to 1.5 mm

Dimension line0.18 to 0.25 mm thick

Extension Line0.18 to 0.25 mm thick

Terminator0.25 to 0.35 mm thick2 to 2.5 mm long

0.35 to 0.5 mm thicki) Section Lines A pattern of thin lines 0.2 to 0.25 mm thick. The pattern and thickness is dependent on the material.

h) Long Break Line To show long breaks

g) Short Break Line For showing short breaks

f) Extension Lines, Dimension Lines and Terminators For extension of edges and placement of dimensions.

e) Phantom Line For showing alternate position and/or adjacent part.

1 to 1.5 mm15 to 20 mm

2 to 2.5 mm