Dear Brendon Slade,
"Brendon Slade" <[EMAIL PROTECTED]> on 2001-06-06 03:31:50 PM
>Off the topic, but why don't you just copy the X and Y coordinates to the
>PCB drill hole and bypass having to place the line then snapping to it?
Um ... good point. Err... I know I had a good reason once ...
I guess this just carried over from a habit I developed when making component
footprints. Every time I draw a circle on a footprint, I always put some line
endpoint (on a mechanical or silkscreen layer) at the center of that circle.
Then ... there was some really good reason for that. Um ...
[Thinking fast, David quickly changes the subject]
Another enhancement:
Many people use a "courtyard" silkscreen that includes all necessary spacing
needed. It would be nice if there were a way to tell DRC that it's OK to allow
silkscreen to overlap (0 mil spacing from *centerline* of silkscreen, rather
than from outer edge of sikscreen).
In pictures, (crude ASCII art):
I have 2 parts that (when I specify 0 mil spacing) DRC currently allows me to
make the outer edge of the silkscreen touch:
+---+
| |
| |
| |
+---+
+---+
| |
| |
| |
+---+
I want DRC to approve when I make the *centerline* of the silkscreen touch:
+---+
| |
| |
| |
+---+
| |
| |
| |
+---+
(but, of course, I still want DRC to warn about any true overlaps of these 2
parts:
+---+
| |
+---+
| |
+---+
| |
+---+
).
Talking about sikscreen,
Ian Wilson <[EMAIL PROTECTED]> on 2001-04-10 08:11:33 PM once
suggested:
>On 10:41 AM 11/04/2001 +1000, John Haddy said:
...
>>clearance rules that
>>would ensure minimum gap between a primitive entity (e.g. pad, or
>>a soldermask opening) and entities on the silkscreen layer (so that
>>one component's legend doesn't end up over a pad).
>
>Yep - there is a lot to think about in implementing this suggestion, new
>rules that I can think of:
>1) Minimum solder mask width (a bit like checking for internal plane
>connectivity)
>2) Overlay near pads (as you mentioned)
>3) others
...
>Ian Wilson
In my current design flow, I make a printout on paper, with silkscreen and pads
and openings in the green soldermask printed as black, and I manually check all
the reference designators to make sure they are readable. It would be nice if
there were a design rule to automatically check this for me: White Silkscreen
ink can only be printed on top of green soldermask.
--
David Cary
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