[PCB_FORUM] mysterious via shifting

From: Ed Caldwell <Ed.Caldwell@xxxxxxxxxx>
To: icu-pcb-forum@xxxxxxxxxxxxx
Date: Fri, 19 May 2006 08:10:41 -0400

Anyone experience a mysterious shifting of vias in Allegro 15.2 s126 
(v15-2-51EU) (12/14/2005) i86... ?

The design is in mils to 2 decimal places. The vias are in a 0.8 mm BGA 
(spaced at 31.50 mils apart). Somehow the group of vias within the 
rectangle pictured below shifted by 0.10 mils sometime during my edits - 
cause unknown...



It is important to note that I did not change the database resolution - it 
has remained (mils to two decimal places). The only thing I changed was 
the routing grid which I switched between 25 mils, 5 mils and 0.1 mils as 
I was working in different areas of the layout and I was not working in 
the area where the vias shifted.

Puzzl_Ed

Ed Caldwell
Electronic Design Services, LLC
Canton, GA - USA

Follow-Ups:

[PCB_FORUM] Re: mysterious via shifting
From: Don . Kost

[PCB_FORUM] Re: mysterious via shifting
From: westfeldt

[PCB_FORUM] mysterious via shifting

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