Re: engineering drawing question


<sylvestersn@xxxxxxxxx> wrote in message
news:1131730775.305355.317800@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>Buddy you've been in management too long. Or maybe work for some
anal-retentive Nazi über-company.

Or maybe I have had some real experience with "scalers "
- the experience of more than once shipping field service men and several
thousand bucks worth of parts halfway around the world and overtime remakes,
because the former chief thought scaling it was close enough and almost
took down the company. Ten thousand dollar mistakes (which come right off
the bottom line) put in just-in-time response equipment because some
engineer, designer, draftsman, and machinist all "scaled it"-- that is not
well received by the customers or the investors.
And I got more than a little tired of having the shop super complain
about drawings unable to be fabricated unless he went to get dimensions from
lonely power-tripping clueless engineers, and tired of meeting time wasted
because some engineer's sketch/private-scale-PT-reading is, oops, a little
off.

>No drawing can anticipate any two points someone might want to know the
distance between.

Sorry, but think about that - and then agree that that is about as stupid a
statement as you have ever heard.
1) Every drawing with its points dimensioned (as I had indicated
before) does specifically and accurately locate each point on that drawing,
And it locates BY DIMENSION any point's location relative to any other
point, either directly or indirectly, not to mention providing an accuracy
within the accumulated tolerances.
Thus if you are getting drawings where you can't determine one point
relative to another by using the dimensions, such that you must scale it,
you either need to send your draftspersons/cad system to school so they put
dimensions on the drawings, or at least teach them where the
"auto-dimension" command is and let the software do it, or you need take a
course in reading dimensions on drawings.
And once your engineers add a new point, do they make a new drawing with
dimensions to that new point, or do you let them write "scale this" since
they will anyway?

2) What do you scaling people do when you get a break line on a part? Do you
use 16 foot long scaled drawings for piping connections? Kind of hard to
scale those 0.5" holes, isn't it?

3) And scaling with a SCALE? Ever hear of CAD?
If you want to find a dimension and you are too lazy to calculate, why
are you using paper and wood? Don't you just point and click onscreen and
ask it for the distance? You can even use the screen on the cad-cam machine
in the shop. We had that one-command ability over 20 years ago.

4) Anyway, if a drawing is communicating to others what the
designer/engineer wants, I have a hard time understanding why anyone wants
to go off on their own with a wooden scale on dired pulp, other than to
prove a point about drawing accurately.

5) BTW, just what exactly is it you measure "to scale" with your scale
instead of your using the dimensions? The location of the main engine thrust
pin? The hole for the blood pump? The heart valve diaphragm mounting sleeve?
The column locations for the 70-story tower?


>The drawing would look crazy and unreadable.

Equally as foolish a statement.
How can it possibly be unreadable if each group is dimensioned and the
group location is dimensioned?
I seriously doubt that your company leaves off dimensions because they
clutter the drawing.


> All my engineers have scales. It would be a pain in the neck without
them.

The engineers or the scales? (Sorry, had to :-) )
(alternative: insert before the previous sentence "Sorry to hear that. My
engineers have tans")

>Like Don said "that's what
>their for".

I think I said that about dimensions.

>It's just a convenience when we are discussing a design,
>or troubleshooting in the factory. Nobody is machining parts using a
scale.

But they are discussing a PROBLEM with a design created by scaling, using a
scale...... ?

Seem kind of odd.

No sarcasm was intended in my post, so if it sounded like it, cut me some
slack because it is Friday and I have government reports due by Monday.

take care


--
Sid


.

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