Re: First angle & third angle

--- In CAD_CAM_EDM_DRO@e..., Peter Chen <cadcamcenter@y...> wrote:

> Good afternoon :-)
>
> John Stevenson" machines@n... wrote:
>
> "The current British and ISO standards state that both
>
> systems of projection are equally acceptable but they
> should never be mixed on the same drawing""
>
> Someone else wrote, I remembered "third angle is
> easier"

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Not true you do EXACTLY the same amount of work. It's just WHERE the
views are placed.

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> I have seen too many mixture of 1st and 3rd angles
> in orthographic projections!!! IMO, 1st angle should
> be abolished. Why?
>
> 3. in autocad (what about other CAD's?) one can
> automatically generate views by clicking on
> the side required. For example, if we have a
> front view, clicking on the top will generate
> a top view positioned to the top of the front
> view

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Could this be because Autocad is an American program and America
favours 3rd angle

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> Is there any CAD programs that generate
> orthographic projections in the FIRST ANGLE

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Yes quite a few of the newer prgrams, Solid works, Solid Edge,
Microstation all have the ability to preselect what ever standard you
want to draw in. Select ISO and all you layouts will be in ISO
standards including dimensioning.
Autocad has long had a reputation for being died in the wool and not
changing

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>
> Already enough confusion from different Gcode
> dialect.
> Let's make an effort in making life easier for
> everyone. Let's start a campaign to abolish
> first angle, AND those dialects/flavors of
> Gcode that we don't like.

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Fine
Lets do the whole lot as well.
One g - code, everybody works in metric, everybody speaks English,
shoot all the left handed people, no 110 volt electrics.
Unfortunalty I don't think it's that easy.
We have whole countries speaking different languages, are these
poeple wrong, not it's just a different way of doing things.
IMO there are no real differances between 1st and 3rd, they are just
different ways of doing the same thing. In the Uk we are
predominantly 1st angle but when I was trained we were taught BOTH
ways.
If you want to campain then campain for people putting the legend on
drawings, either written or the universal cone logo to SHOW what
angle it has been drawn in.

**********
John Stevenson