[PCB_FORUM] Re: Copper balancing "thieving dots"

Mitch,
        I used to work for a company that had insisted that the total
        copper area per layer be symmetrical within +/-10 percent
        vertically within the stack-up.

        e.g.   Total copper area on layer 1 (top minus 1) would
                 have to be within 10 percent of layer 7 (bottom plus 1)

        Their manufacturing group believed that boards would be less
        likely to warp when heated in the IR oven, if the entire PCB 
        had a uniform distribution of copper in both the x-y and z axis.
        Even distribution of copper on all layers also helps the PCB
        manufacturers, weather they ask for it or not.


Regards,
       Mike Finczak
       CopperCAD Design
       www.CopperCAD.com
       905-488-8958

-----Original Message-----
From: Mitch S. Morey [mailto:cadpro2k@xxxxxxxxxx] 
Sent: September 22, 2004 12:57 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Copper balancing "thieving dots"


Hi Mark,

Dumb question... Why not just copper pour (GND plane) the top/bottom
layers, to have the same result? Be a lot quicker to me. Am I missing
something?

Good day.

> -----Original Message-----
> From: Mark Salberg [mailto:msalberg@xxxxxxxxxxxx]
>
> Does anybody know of an easy way to create (in Allegro) copper balance

> thieving dots? We are instructed to balance all boards in the database

> and not to give fab free rein in their placement.
> We are currently adding 100 mil shapes on 200 mil spacing...manually.
>
> Thanks,
> Mark
>
>
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