ED Tips : Dimensions for orthographic view


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 

•Parallel Dimensioning
•Parallel dimensioning consists of several dimensions originating from one projection line.




•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.
 
Chain Dimensioning
 
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.
 
 
Hope you find it useful!
 
Enjoy!
  
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Engineering Drawing Tips : Orthographic projection

Conventional Orthographic Views



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 thick continuous line is used for visible edges and outlines.
                                               

A thin line is used for hatching, leader lines, short centre lines, dimensions and projections.


Line Styles
Other line styles used to clarify important features on drawings are

                    
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.




Dashed lines are used to show important hidden detail for example wall
thickness and holes..


•Visible lines takes precedence over all other lines
•Hidden lines and cutting plane lines take precedence over center lines
•Center lines have lowest precedence







 Example is as shown above.


Hope you find it useful!

Enjoy!
Anonymous

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