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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