In a message dated 03/14/2000 11:36:50 AM Central Standard Time,
[log in to unmask] writes:
<< Steve,
Keep in mind how that is worded. The requirement say's "...20% of the
minimum value, or less."
Now if the artwork require a minimum trace width of let's say 10 mils, and
you make the trace 11 mils, the 11 mils trace is reduce by 21%, would this
be rejectable in accordance with A-600? Or would the minimum value (i.e. 10
mils plus or minus the allowable tolerance) be the starting point to
subtract 20%?
~finished stirring the pot, slowly walking out before things start flying~
Franklin D Asbell
Network Circuits, Inc.
Irving, Texas 75061
972-313-1400 >>
Thanks everybody!
On this deal it's not like I have to "split hairs"...it's almost (if not) 50%
of the trace width...
Something kinda' ironic about this whole deal, is that I was just gazing over
one of the "X-outs", and they had used a black magic marker to do the "X" on
the PCB, they also circled where the PCB was no good and caused it to be an
"X-out"...it was the notch on the trace. But what was strange, all of the
rest of the boards had the same notch in the trace but yet none of them were
"X'ed-out"?!?!! That's why I asked ya'll to confirm what I read in the
IPC-A-600F...I couldn't understand why they would "X-out" one board and not
the rest. If they hadn't circled the notch on that one board, I may have
never noticed anything...
Oh, if anybody wants to see a picture of it, I learned a neat little trick
with my digital camera (I gotta a FUJIFILM MX-600 Zoom). I learned I can take
a picture through a microscope eyepiece with the camera. I focus what I'm
looking at in the microscope, take the rubber "dealy" thing off the eyepiece,
set my camera to "Macro" mode so that I can see the image in the LCD display
on the back of the camera, put the camera lense right on the micrscope lense,
and "click" take the picture! Comes out pretty good too!
Thanks again!
-Steve Gregory-
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