I like Mary Sugden a lot! What class did you take?
I took a flex circuit design class there once, it was
GREAT!
Anyway (sorry to contradict you in public so much) I
just think if the IPC is sponsoring this forum, we
should at least TRY to say what they recommend when a
new guy asks a "newbie" question, and then add our own
experiences after that. It least the IPC gives people
a starting point (just my opinion). I love to hear the
banter back and forth, it illustrates what areas need
to be worked on the most.
I'm happy to hear you are participating in committees,
I have never tried that.
Have you ever downloaded standards in progress as PDF
files? All you do is send a mail to
mailto:[log in to unmask]
and in the SUBJECT just say
request (whatever)
for example send one and say
request IPC-SMEMA-1
and you will get it.
its just a working copy but it is always a later
version than what anyone else has!
(but it doesn't always work, only specs in "working
draft" mode? I don't know...)
anyway, keep up the good work!
(and thanks for the calculator)
seeya,
Jack
p.s. by the way, I don't think the main focus of the
IPC is to start developing "application specific"
numbers for every possibility, because they could
never keep up with what we are doing out here in the
world. Instead I think they do a decent job getting
people started who wouldn't otherwise know what to do,
or who don't want to be at the mercy of what one
particular vendor says to do. (again, just my opinion)
until next time....
--- Chris Robertson <[log in to unmask]>
wrote:
> Jack,
> I didn't take any offense, I read between the lines
> and took it as "don't just take someone's word for
> it"
>
> I got my initial values from Mary Sugden (teaches
> as copper connection.)
>
> I agree, and that part of the reason why it is
> difficult for me to just throw numbers out there
> and it be accepted as fact.
>
> The problem, again lies in application. There are
> so many variables, if someone wants to use them,
> but I guess it is the best we have until we get
> some hard documentation or IPC gets off it and
> specifies some of these values. I will be submitting
> some information/values to several comities to get
> this added to the standards.
>
> Did the standards quoted match with yours?
>
> I have attached a calculator (don't know if you
> already
> have it) that Implements these values.
>
> Again, you are very correct, but what are our
> options
> at this time?
>
> Chris Robertson
> [log in to unmask]
> <mailto:[log in to unmask]>
>
> Senior Designer
> Lockheed-Martin Services Inc.
> 4912 Research Dr.
> Huntsville, AL 35805
> (256) 722-2626
> http://www.lmsg.lmco.com <http://www.lmsg.lmco.com/>
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