Drawing standards

[Goran HosinskyParticipant @goranhosinsky61367]

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

[Goran HosinskyParticipant @goranhosinsky61367]

[JulieParticipant @julie]

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 

[JulieParticipant @julie]

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 HosinskyParticipant @goranhosinsky61367]

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

[JulieParticipant @julie]

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 GarnettParticipant @stevegarnett62550]

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. ShawParticipant @peterg-shaw75338]

Goran,

 

Suggest a read of Tubal Cain’s book Workshop Drawing, Workshop Practice Series No. 13. 

 

Regards,

 

Peter G. Shaw

[Author]

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