[PCB_FORUM] Re: Copper balancing "thieving dots"

Information that comes from sourcelink should not be distributed on this forum 
it is Cadence IP. 

sourcelink users agree to terms listed in the section "terms of usage", for 
example .....

"2. Copyright and trademarks
 2.1 Copyright. Cadence Design Systems, Inc., 2002. All rights reserved. The 
entire content of this Site is copyrighted    unless otherwise noted. Nothing 
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Cadence does not warrant or represent that your use of the  materials displayed 
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affiliated with Cadence."

Although the SKILL programs out there are shareware and the authors are the 
owners of that IP It is up to them to distribute that on this forum. It is not 
ethical to take a program off sourcelink and distribute it with out the authors 
or cadences permission.

If you have a maintenance contract with cadence you can sign up for sourcelink 
for free and get it there.


Carl Musetti

ICU PCB SIG board member

-----Original Message-----
From: Mark Salberg [mailto:msalberg@xxxxxxxxxxxx]
Sent: Wednesday, September 22, 2004 1:14 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Copper balancing "thieving dots"


The inner and outer layers require copper balancing  for warpage issues related 
to "lead free soldering processes".
Also, in copper starved areas with a small trace which may result in over 
etching problems. 

So, the bottom line is that we have to do this...Is the skill routine available 
on Sourcelink or can you or somebody fwd this to the group?

I am not sure if it is the same as the "Automatic Copper Balancing" on 
Sourcelink.

Mark

george.h.patrick@xxxxxxxxxxxxxx wrote:


There should be no reason to have the thieving on other than the top and 
bottom, unless your board house is running some sequential lamination stuff 
(i.e. buried vias and such).
 
I had done some work on the shareware balancing program originally written by 
David Sheuring in 1984 to adapt it to some of the things we do here, adding 
"thieving keepout" areas,  and the ability to automatically remove the 
thieving.  It takes about 30 seconds to balance a side on my current board 
using the skill routine,  it's been 4 minutes or more for the built-in Cadence 
routine and it's still not done.  I don't know what else it is checking for, 
but it certainly is slooowwwwwwwwww...
 
I think I'll still use the  skill routine  :)
 
I think the original still on sourcelink, my version probably wouldn't work 
outside Tektronix.
-- 
George Patrick
Tektronix, Inc.
Central Engineering, PCB Design Group
P.O. Box 500, M/S 39-512
Beaverton, OR 97077-0001
Phone: 503-627-5272         Fax: 503-627-5587  <http://www.tektronix.com/> 
http://www.tektronix.com     <http://www.pcb-designer.com/> 
http://www.pcb-designer.com

It's my opinion, not Tektronix' 

-----Original Message-----
From: Mark Salberg [ mailto:msalberg@xxxxxxxxxxxx] 
Sent: Wednesday, September 22, 2004 08:30
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: Copper balancing "thieving dots"


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

Dennis Ward wrote:


What are you running? I don't have utilities under tools menu.



I'm in Allegro Designer 14.2



Dennis



-----Original Message-----

From: Uri Chaplianka [ mailto:urich@xxxxxxxxxx]

Sent: Wednesday, September 22, 2004 10:49 AM

To:  icu-pcb-forum@xxxxxxxxxxxxx

Subject: [PCB_FORUM] Re: Copper balancing "thieving dots"





  

Is there a list of all Allegro commands available? 

    



Yes,  Tools->Utilities->Keyboard Commands.



Uri





-----Original Message-----

From: Mark Salberg [ mailto:msalberg@xxxxxxxxxxxx] 

Sent: Wednesday, September 22, 2004 4:49 PM

To:  icu-pcb-forum@xxxxxxxxxxxxx

Subject: [PCB_FORUM] Re: Copper balancing "thieving dots"





Uri,

Thanks a lot!

I could not find anything in Allegro Help.

It looks to be exactly what we were looking for.

Is there a list of all Allegro commands available?

There is an Automatic Copper Balance PDF on Source Link, but looks like 

a skill file that would have to be loaded independently.

We will give your suggestion a try Uri.



Thanks again,

Mark



Uri Chaplianka wrote:



  

Hi Mark !

Just within Allegro type: "thieving".



Uri



-----Original Message-----

From: Mark Salberg [ mailto:msalberg@xxxxxxxxxxxx]

Sent: Wednesday, September 22, 2004 4:20 PM

To: Cadence User Group

Subject: [PCB_FORUM] Copper balancing "thieving dots" 





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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