[PCB_FORUM] Re: nets shorted to gnd plane

Oh, geeezzzz....  Next thing you know, the "Use positive planes" crowd will be 
rolling out, warning everyone that them newfangled negative planes just don't 
work  :)  If you don't use a feature you are never going to work the bugs out 
of your process.

In 12+ years working with RS274X, I have never seen a short in the board that 
wasn't caused by a loose nut on the keyboard (often the one I see in the 
mirror).  Look carefully and I'll bet you find a bad thermal size, vector based 
pad behavior turned off, or one of the things the others were talking about.

While we are on it, beware of Valor.  It sometimes gives you false shorts and 
brokens (usually brokens) when you run the netlist analyzer.  When you dig in 
and really look at them, you find they are bogus or (again) loose nut on the 
keyboard stuff (damn, forgot to set those drill depths again).  This happens 
much more with the direct extract from Allegro, much less often when importing 
gerbers.

--
George Patrick
Tektronix, Inc.
Central Engineering, EDS Applications Support
P.O. Box 500, M/S 39-512
Beaverton, OR 97077-0001
* 503-627-5272 (voice)     * 503-627-5587 (fax)
http://www.tektronix.com<http://www.tektronix.com/>    
http://www.pcb-designer.com<http://www.pcb-designer.com/>

"Off-Grid and Proud of it!"

-----Original Message-----
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Dale Rasmusen
Sent: Monday, July 20, 2009 16:17
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: nets shorted to gnd plane



Hi Sam,



We have had problems in the past with 274X formats where they will have nets 
shorted to planes.  You won't see the short in Allegro, but you can definitely 
view it in a gerber viewer and it is very random.  We currently use the 274D 
format and that works just fine, we just don't have the embedded apertures.  It 
is no big thing to the board house, they will use the photoplot.log that is 
generated for apertures.



Dale Rasmusen

CAD Manager

TEKNOVUS


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