[PCB_FORUM] Re: Copper balancing "thieving dots"
- From: "Andrew Noonan" <andrew@xxxxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Wed, 22 Sep 2004 10:03:27 -0700
There may be times when you DO want to control board thickness within a
certain tolerance, especially when the board is 32 layers and over 0.20"
thick. It could be that there is unbalanced distribution of copper
across a board area, (i.e., much copper in an area, and little
elsewhere) potentially causing board thickness variations in different
topographic areas. Keeping copper evenly distributed will help to keep
an even distribution of overall thickness tolerance.
-----Original Message-----
From: Mitch S. Morey [mailto:cadpro2k@xxxxxxxxxx]
Sent: Wednesday, September 22, 2004 9:54 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Copper balancing "thieving dots"
There's absolutely NO reason to have this 'copper theiving' addition on
internal layers. Outers only. (Yes, I have been asked, ONCE, by a mfg
whether he could add it, but that was only because I had LARGE traces on
one side of a 8x10" board, and the other side had a series (6 or so) of
.005" traces running in parallel along the edge. Once in 20 years!)
Good day.
> It looks like this will be a very useful utility. One more question:
Can
> anybody tell me if it is better to have copper balance pads aligned or
> offet from layer to layer?
> _
> _
> _ or _ _ _
> _ _
> _ _ _
>
>
> Thanks for all your help!
> Mark
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