[PCB_FORUM] Re: two shapes on shape-based pad.

this sort of thing is good to pass on. thanks for the info.

________________________________

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Mark Salberg
Sent: Wednesday, October 15, 2008 10:41 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Cc: blm@xxxxxxxxxxx
Subject: [PCB_FORUM] Re: two shapes on shape-based pad.


Wo...stop the presses Barbara,
Just got if fixed!
Our librarian just found that since it is a "shape-based pad" it does
not get refreshed until you refresh symbols THEN PLACE -> Update Symbols
-> Shape and flash symbols -> then select rl279a2 and rl279a2sm.

And it WORKED!

Sorry for wasting any of your time, but this was just discovered after I
sent the board to you.
Also, thanks for the other feedback from the group.

Thanks again!
Mark


Barbara Seeger wrote: 

        Mark,
        
         I think I can explain the problem. There is an arc that is very
small
         in that pad shape. It has been rounded down by the Gerber
viewer, which
         moved the end points to points that forced the arc to draw in
the 
         opposite direction. This ends up looking like a void in the
shape.
         
         You should look at the brd accuracy, and the artwork decimal
accuracy
         written. We had in the past done that same rounding down in the
artwork
         we wrote when the inch decimal output was less than the brd
accuracy.
         That was fixed so that we flatten those small arcs to prevent
such
         issues if customers have CAM systems that are not able to read
high
         accuracy artwork files. That's what makes me suspect it's the
GCPREVUE.
         
         You end up with 2 choices. You can edit the shape data in
Allegro, and 
         remove the arc yourself or you can see if the CAM station can
be set up
         to read at a matching accuracy.
         
         If I've confused you or you want Cadence o help directly,
please 
         contact me directly.  I'd be happy to take a look after you
review 
         the output logs and check the CAM tool to see if this is
pointing to it.
         
         Regards,
         Barbara Seeger   978-262-6578   Cadence Design Systems
          
         
        
          

                From: Mark Salberg <msalberg@xxxxxxxxxxxx>
<mailto:msalberg@xxxxxxxxxxxx> 
                
                
                Anybody know what can cause this?
                Our librarian can not see the circular shape which shows
up as a void on 
                the pad.
                DBcheck shows the attached error and does not show up in
lib editor.
                It can also be seen in gerber format on GCPREVUE.
                
                Thanks,
                Mark
                
                
                
        
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