Download presentation
1
Mechanical Drawing (MDP 115)
FirstYear, Mechanical Engineering Dept., Faculty of Engineering, Fayoum University Dr. Ahmed Salah Abou Taleb
2
Aims of the course This module is designed to provide students with an analysis of mechanical drawings. Comprehensive study of fasteners. Methods of assembling various mechanical parts together with and without locking devices (working drawings, dimensional tolerance, fits, surface finishing).
3
Course Outlines Part One: Review.
Dimensions, Limits, Fits and Tolerance. Surface Roughness. Standard Machine Elements (threads, fasteners, Keys, spline, gears, pulleys, bearing, …….). Welding and Riveting Conventions.
4
Course Outlines (Cont.)
Part Two: Introduction to Computer Graphics. Wire Frame. Applying solid modeling of mechanical components. Assembly drawing. Production Drawing.
5
Teaching and Learning Methods
Power Point Lectures. Computer Program (Auto CAD). Class Work Drawings. Home Work Assignments. Quizzes.
6
Weighting of Assessment
Final Exam 80 Mid Term Exam 20 Class Work Drawing Home Work Assignment Oral 10 Total Marks 150
7
Review - Instruments The following is the list of drawing instruments and other drawing materials required for preparation of drawing work: Drawing board T-Square Set- Triangles – (30o – 60o and 45o) Instrument box consists of compasses and dividers Mechanical Pencil Rubber or eraser Erasing shield Scotch-tape Duster or handkerchief Drawing sheet
8
Review - Basic Line Types
Name according to application Types of Lines Appearance Continuous thick line Visible line Continuous thin line Dimension line Extension line Leader line Dash thick line Hidden line Chain thin line Center line NOTE : We will learn other types of line in later chapters.
9
Review - Drawing Scales
Length, size Scale is the ratio of the linear dimension of an element of an object shown in the drawing to the real linear dimension of the same element of the object. Size in drawing Actual size :
10
Review - Drawing Scales
Designation of a scale consists of the word “SCALE” followed by the indication of its ratio, as follow SCALE 1:1 for full size SCALE X:1 for enlargement scales (X > 1) SCALE 1:X for reduction scales (X > 1) Dimension numbers shown in the drawing are correspond to “true size” of the object and they are independent of the scale used in creating that drawing.
11
THE OBJECT IS ASSUMED TO BE SITUATED IN FIRST QUADRANT
FIRST ANGLE PROJECTION FOR T.V. IN THIS METHOD, THE OBJECT IS ASSUMED TO BE SITUATED IN FIRST QUADRANT MEANS ABOVE HP & INFRONT OF VP. V.P. P.P. S.V. F.V. OBJECT IS INBETWEEN OBSERVER & PLANE. OBJECT X Y VP HP PP FV LSV TV FOR S.V. FOR F.V. ACTUAL PATTERN OF PLANES & VIEWS IN FIRST ANGLE METHOD OF PROJECTIONS
12
FRONT FRONT
13
FRONT TOP TOP FRONT
14
FRONT SIDE VIEW TOP TOP SIDE VIEW FRONT
15
orthographic projection TOP
SIDE VIEW FRONT SIDE VIEW TOP SIDE VIEW First angle orthographic projection TOP SIDE VIEW FRONT
16
DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD
FOR T.V. ORTHOGRAPHIC PROJECTIONS FRONT VIEW L.H.SIDE VIEW X Y FOR F.V. FOR S.V. TOP VIEW PICTORIAL PRESENTATION IS GIVEN DRAW THREE VIEWS OF THIS OBJECT BY FIRST ANGLE PROJECTION METHOD
17
GRAPHICS COMMUNICATION WITH ENGINEERING DRAWING
Object Orthographic Projection Dimensioning Working drawing Orthographic projection (convention) Clear ? No Section Views Yes Section views convention Finish
18
PURPOSES OF SECTION VIEWS
Clarify the views by reducing or eliminating the hidden lines. revealing the cross sectional’s shape. Facilitate the dimensioning. Let See the example
19
EXAMPLE : Advantage of using a section view.
20
SECTION LINING Section lines or cross-hatch lines are used to
indicate the surfaces that are cut by the cutting plane. Section lines Drawn with 4H pencil.
21
FULL SECTION VIEW The view is made by passing the straight cutting plane completely through the part.
22
TREATMENT OF HIDDEN LINES
Hidden lines are normally omitted from section views.
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.