Orthographic projections are a collection of 2D drawings that together accurately represent an object. The six principal views or orthographic views are the front, top, side, and bottom views as well as two end views. Together these views provide all the necessary information to understand the object's dimensions and geometry. Proper dimensioning, line types, and tolerancing are required for manufacturing. Dimensioning provides all measurements needed, lines signify geometry and features, and tolerancing conveys permissible manufacturing variations. Title blocks with identifying information and notes are also included for context.
Detail drawings completely describe a single part with multiview orthographic projections.
Should provide all the information necessary to economically manufacture a high quality part.
Engineering-Drawing-Notes.pptxPart A - 2D Drawing PrinciplesDr.M BALA THEJA
Detail drawings completely describe a single part with multiview orthographic projections.
Should provide all the information necessary to economically manufacture a high quality part.
check it out: http://goo.gl/vqNk7m
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2. Orthographic Projections
• Orthographic Projections are a collection of
2-D drawings that work together to give an
accurate overall representation of an object.
4. Which Views to Present?
General Guidelines
• Pick a Front View that is most descriptive
of object
• Normally the longest dimension is chosen
as the width (or depth)
• Most common combination of views is to
use:
– Front, Top, and Side View
5.
6. Glass Box Approach
• Place the object in a glass box
• Freeze the view from each direction (each
of the six sides of the box) and unfold the
box
15. Lines on an engineering drawing signify more than just the geometry of the object and it is
important that the appropriate line type is used.
Line Thickness
For most engineering drawings you will require two thickness', a thick and thin line.
The general recommendation are that thick lines are twice as thick as thin lines.
A thin line is used for hatching, leader
lines, short centre lines, dimensions and
projections.
A thick continuous line is used for visible
edges and outlines.
Line Styles
Other line styles used to clarify important features on drawings are:
Dashed lines are used to show important hidden detail for example wall
thickness and holes..
Thin chain lines are a common feature on engineering drawings used to
indicate centre lines. Centre lines are used to identify the centre of a circle,
cylindrical features, or a line of symmetry.
16. • Visible lines takes precedence over all
other lines
• Hidden lines and cutting plane lines take
precedence over center lines
• Center lines have lowest precedence
Precedence of Lines
0.6 mm
0.3 mm
0.6 mm
18. Dimensioning
A dimensioned drawing should provide all the information necessary for a finished product
or part to be manufactured. An example dimension is shown below.
Dimensions are always drawn using continuous thin lines. Two projection lines indicate
where the dimension starts and finishes. Projection lines do not touch the object and are
drawn perpendicular to the element you are dimensioning.
All dimensions less than 1 should have a leading zero. i.e. .35 should be written as 0.35
19. Types of Dimensioning
• Parallel Dimensioning
• Parallel dimensioning consists of several
dimensions originating from one projection
line.
20. •Superimposed Running Dimensions
•Superimposed running dimensioning simplifies parallel
dimensions in order to reduce the space used on a drawing.
The common origin for the dimension lines is indicated by a
small circle at the intersection of the first dimension and the
projection line.
22. Dimensioning of circles
• (a) shows two common methods of dimensioning a circle. One method
dimensions the circle between two lines projected from two diametrically
opposite points. The second method dimensions the circle internally.
• (b) is used when the circle is too small for the dimension to be easily read if
it was placed inside the circle.
23. Dimensioning Radii
• All radial dimensions are proceeded by the capital R.
(a) shows a radius dimensioned with the centre of the radius located on the drawing.
(b) shows how to dimension radii which do not need their centres locating.
24. Tolerancing
• It is not possible in practice to manufacture products to the exact figures
displayed on an engineering drawing. The accuracy depends largely on the
manufacturing process. A tolerance value shows the manufacturing
department the maximum permissible variation from the dimension.
• Each dimension on a drawing must include a tolerance value. This can
appear either as:
• a general tolerance value applicable to several dimensions. i.e. a note
specifying that the General Tolerance +/- 0.5 mm.
• or a tolerance specific to that dimension
25. Drawing layout
All engineering drawings should feature a title block.
The title block should include:
Title:- title of the drawing
Name:- name of the person who produced the drawing
Checked:- before manufacture, drawings are usually checked
Version:- many drawings are amended, each revision must be noted
Date:- the date the drawing was produced or last amended
Notes:- any note relevant to the drawing
Scale:- the scale of the drawing
Company name:- name of the company
Projection:- the projection system used to create the drawing