[PCB_FORUM] Re: Copper balancing
- From: "Mitch S. Morey" <cadpro2k@xxxxxxxxxx>
- To: icu-pcb-forum@xxxxxxxxxxxxx
- Date: Wed, 22 Sep 2004 10:13:03 -0700 (PDT)
Like I said, once in 20 years. If you've got that much open area on a
board, why not move that isolated copper to another layer (maybe
re-layout) and decrease the layer count? I've NEVER had enough open area
on a board to warrant adding "unbalanced distribution" copper. Guess
you're lucky. :) <-- that's envy.
Good day.
>
> 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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