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Drawing standards

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Goran Hosinsky16/03/2010 21:21:40
41 forum posts
What is the standard placement of the different views in a drawing? I thought it was, starting with the face on in the center, below the projection seen from above and to the right the projection seen from the left hand side but I find that MEW seems to have another system.
 
Goran
Canary Islands
Julie16/03/2010 21:47:57
24 forum posts
1 photos
The standard should be
 
                                 Top or Base
 
 
Left or Right             Front view          Right or left           Rear view
 
 
 
                                 Base or Top
 
 
 sometimes the rear view is located to the far left rather than the far right
 
Left or right and Top or Base etc is determined by the projection used i.e. third or first
 
Not all views are shown - should only show a view if it adds value
 
Julie 
Julie16/03/2010 21:50:49
24 forum posts
1 photos
Sorry forgot to add - from your description starting with the font view in the centre and the top view placed below, etc this is first angle projection
 
Julie 
Goran Hosinsky16/03/2010 22:17:50
41 forum posts
Do I understand right then that
 
 
                                    seen from the bottom
 
 
 seen from the right                                                                    seen from left
                 
                                     seen from the top
 
is the first angle prjoection?  Which one of the projection types are normally used?
 
Goran
Julie16/03/2010 23:17:28
24 forum posts
1 photos
sort of.
 
I know it sounds picky but the right view (more correctly called elevation)  is placed on the left.
 
It is important because this indicates the correct placement of the edges.
 
Imagine a light shining from the right through the object to cast a view on the left on say a "door" or side of a box, this being closed flat as below
 


 
this gives the correct placement.
 
Please forgive the poor drawing, it was done using the draw functions in word for mac !
 
As for which is normal - both!
 
I drive on the left, and use first angle projection.
 
However it does appear that there are people in the US who actually drive on the other (wrong) side of the road! They also appear to use third angle!
 
It really depends on what you were brought up with, both are equally valid, and pages could be filled with which is best (Metric vs Imperial; Manchester United or Liverpool; etc etc)
 
The key thing is that the truncated cone symbol should always be included  to show if it is first or third angle as this clears any ambiguity.
 
Julie 

Edited By Julie on 16/03/2010 23:25:49

Edited to show drawing! 

Edited By Julie on 16/03/2010 23:30:09

Steve Garnett17/03/2010 00:33:27
837 forum posts
27 photos
My understanding, from the recent thread where this was discussed in depth, is that ME and MEW are going to standardise on third angle, because to most people it seems to make more intuitive sense...
 
One way to look at it is that you start with the front view, and if you went around the side of it and looked at it, then that's what you would drawn in that position. The difference between this and  first angle projection is that in first angle, you stay where you are and the object you are drawing moves instead.
 
The normal way to describe first and third angle is to explain what they actually mean. Start with the front view - what's drawn on the left in first angle is what you'd see if the front view was flipped to the left 90 degrees. To turn this into third angle, you'd have to flip it twice more so that it had turned 270 degrees. And the same thing applies on the right, top and bottom with the flipping towards that position in each case.
 
Do I care? Not really, but everything this week has ended up in third angle because the bloke doing the CAM conversions gave me a funny look last time he got first angle to work from, and that seemed like a good enough reason to do 'em third angle!
Peter G. Shaw17/03/2010 13:42:48
avatar
1531 forum posts
44 photos
Goran,
 
Suggest a read of Tubal Cain's book Workshop Drawing, Workshop Practice Series No. 13. 
 
Regards,
 
Peter G. Shaw

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