First angle and Third angle

[John Stevenson" <machines@...>

> Someone else wrote, I remembered "third angle is
> easier"************

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

All on this list will know that the amount of PHYSICAL
work is the same.
What about the interpretation of the projections?
(MENTAL work)
To me, it just seem so much more logical to put the
view on
the same side from which it is viewed. I'm sure you
have noticed
the difference in the learning curve of those CADCAM
(and other)
programs which is "intuitive" and those which are not.
Put in
enough effort, I suppose, the end result may be the
same, but
give me those "intuitive" ones anytime.

[shoot all the left handed people, no 110 volt
electrics.]
Any gunsmith on the list?? :-)


[From: "Ian Wright" <Ian@...>
I'm not sure that the fact that one flavour of CAD
program does a thing
one way is a good enough reason to abolish all others.
]

People on this list takes to 3D and technical drawing
like
duck to water, so FIRST ANGLE and THIRD ANGLE will
just take
a little extra effort of their part. How about the
frustration of
having to deal with people who have to strugle with 3D
concepts
and even the meaning of projections?

[If I had to go with any one drawing projection system
I would probably
choose First Angle as I can find it easier to imagine
and teach others.
For instance, get a dice, lay it on the table and look
down on it. Take a
photograph. Now roll it onto its right side and take
another photo,
similarly onto its left side and top [FRONT?]. Now
merge the photos by directly
overlaying them and what do you have? First angle
projections. Simple
'aint it?]

Thanks. This explanation is new to me. I think the top
(check snip) is a
typo. Would the below illustrate your explanation?

[lay it on the table and look down on it]
VIEW FROM THE TOP: (front is at bottom of dice)
_______
| |
| top | roll---->
|______|
[roll it onto its right side and take another photo]
_______ ______
| | |
<---- | top | left |
|______|______|
[similarly onto its left side]
/\
|
_______ _______ ______
| | | |
| right | top | left |
|_______ |______|______|

[and top [FRONT?].]
_______
| |
| front|
| |
_______ _______ ______
| | | |
| right | top | left |
|_______ |______|______|

Thanks. Now I have one more bullet in my arsenal. BUT
still, though it is simple to you, it is unnecessary
extra mental work for some others.

[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]

Wish I have the time to learn all of them! Anyway,
hope that
this ISO standard, etc, isn't just refering to the
border, title
block, etc. but to actual automatic generation of the
views
from a model (please confirm).

[almost impossible to get screws with particular
properties - no coarse Whitworth threads for soft
stuff or BSF fine threads for hard stuff - all you can
get is the one 'average' metric thread which is
neither use nor ornament. Imagine the fun trying to
get bolts to replace those in older machinery.]

How about creating new metric standard for use or
ornament? Regarding older machineries, isn't that the
reason those stubborn Americans are still sticking to
their Imperial inches and gallons. Don't we have to
start somewhere, sometime, or do we still continue
postponing the inevitable and prolong the pain (the
pain will definately be more painful the longer we
prolong it, there will be more and more "older
machineries" as time goes by) for example:
Current frustration: Denford mill (Imperial
manufacturer?) uses metric collet. I have some
relatively cheap Dremel cutters which I wanted to use
on the Denford mill and Dremel bits are imperial!!!!
And I have been hunting for a V-end mill here without
success!!! And no one can supply me an Imperial collet
for the Denford Mill. Isn't this run-about reason for
me to start shouting for everyone to make an extra
effort towards standardisation?

Anyway, thanks for that piece of new information.

SS (Serious Simon)

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