Problem with broken-ot section and hidden edges

Hi!

I tried to do a technical drawing that is showing the hidden edges of a hole
and in the same view a broken out section of a threaded hole. As soon as I
do the broken-out section, the hidden edges disappear!!

When I remove the section, the edges come back...

Anyone have an idea?

Thanks,
Thomas

 

I take it your maybe a young person then. Back in the old days when
we leaned against a solid lump of wood, sharpened our lead on sand
paper and poked our eyes out when we fell asleep the golden rule was
and as far as I know still is (could get flamed here) "NO HIDDEN LINES
IN SECTION VIEWS".

 

If you're going to tell someone they don't know what they are doing because
you assume they are young, then, yeah your gonna get flamed. A break out
view is a combination of a section view and a regular view, so hidden lines
are perfectly fine. Also, if you section a tapped hole you always show the
tap lines. See sections 3.9.8.9 and 12.4.6.9 of the DRM and pull your head
out. Boy did you hit one of my pet peaves with that first sentence.

 

so, we can assume that you are, also, young?
:~)>

--
bob z.
p.s.

"people with less brain power than you are doing more difficult things
everyday"©

 

According to my Books and from what I was taught in College, hidden lines
are not to appear in section views. Quote from the book I'm reading
"Sections are used primarily to REPLACE Hidden-line representation; hence,
as a rule, Hidden lines SHOULD be omitted in Section views."

So whether Thomas is young or not is irrelevant. But I have to agree with
Brian that hidden lines are not suppose to exist inside of a section view.
Unless they are teaching something new in the classrooms or in published
books of today.

Regards,
Scott

 

In general hidden lines are frowned upon in *standard* section views because
they are just clutter, which was very well stated in your book's quote.
However, according to the Drawings Requirement Manual ANSI Y14.100-2000
hidden lines are acceptable in *broken-out* section views. Under section
3.9.8.9 "Broken-Out Sections", Figure 3-34 shows exactly what Thomas was
asking about: a broken-out section view with hidden lines from holes showing
elsewhere on the part. I was teaching a class on drafting at UC Berkeley
about 7 years ago and it was the same then.

Tap lines are required when a tapped hole is sectioned, so to Thomas'
original question yes, these should remain and not disappear. I asked my
detailer how he handles this bug and he said he simply draws them back in
with lines. Perhaps there is a better way.

As far as my age, bob zee, I'm old enough to know it would be stupid for me
to reveal that on a public newsgroup ;->. As my former CEO once said, "It's
not about age or experience, but about excellence."

 

Scott: Thanks for the backup, that's the way I was taught. I had a
good look thro ISO drawing standard VOL 1 and VOL 2 today, but could
not find anything to conclusively back up my statement.

Mickey: I merely mentioned that Thomas "MAYBE" a young guy. This was
not meant to be in anyway inflammatory, just a view that today's
younger generation of designers have possibly only ever used a CAD
system to do there designs and take whatever the system outputs as
being correct to there particular drawing standard. Also the Tap Line
is not a hidden line; it's a graphical representation of the root of
the thread.

Cheers
Brian

 

Hi!

Thanks to Mickey for the answer. Could have thought of that myself...

Anyway, as far as what the age is concerned, I am still in training at
university. And the problem with the lines appeared when I tried to do my
homework "copying" a drawing in CAD from my teacher. She requires me to do
it as in the handout. And my personal opinion is that hidden lines are ok
when you want to show that there is a hole through the part and at the same
time want to show a threaded hole. Can't tell you the DIN standard for that.
Anyway, I thought I try doing it on our student edition at school because I
think that ACAD is stupid but maybe I have to use it since its an ACAD
course . That is my oppinion.

Thomas