[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>


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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