[PCB_FORUM] Re: BBVs
- From: "Gene Carman" <gcarman@xxxxxxxxxxxxxxx>
- To: <icu-pcb-forum@xxxxxxxxxxxxx>
- Date: Fri, 8 Apr 2005 17:22:25 -0700
Exactly! You don't need to show all layers, but you do need to show a drawing
for each drill/layer combination.
-----Original Message-----
From: Feehan, Stephen [mailto:Stephen.Feehan@xxxxxxxxxxx]
Sent: Friday, April 08, 2005 12:40 PM
To: 'icu-pcb-forum@xxxxxxxxxxxxx'
Subject: [PCB_FORUM] Re: BBVs
What you need is a drill drawing and drill chart for each
Blind or Buried drill. If the board is small enough you can
import all 3 artwork fab dwg's into one, however, I have large
panel boards so I have 3 separate fab dwg's.
The 1st fab shows layer 1-14 (all thru vias)
The 2nd shows Layer 1 -2 only (blind 1-2)
The 3rd shows Layer 13 -14 only. (blind 13-14)
-----Original Message-----
From: Gary MacIndoe [mailto:gary.macindoe@xxxxxxx]
Sent: Friday, April 08, 2005 3:29 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: BBVs
Hey George,
I think you are misunderstanding me. Yes I have a drill chart for each blind
drill (one chart is 1-2, and the other is 7-8). They are the same size, so
they have the same drill figure.
The drill symbols within the board outline are used with the drill chart(s) for
a reference, so since both 1-2 and 7-8 drills have the same drill figure, how
can you tell which is which from the figures in the board outline? You can't!
Oh well!
Gary E. MacIndoe
PCB Design Engineer
Advanced Micro Devices, Inc.
Longmont, Colorado
-----Original Message-----
From: george.h.patrick@xxxxxxxxxxxxxx [mailto:george.h.patrick@xxxxxxxxxxxxxx]
Sent: Friday, April 08, 2005 11:11 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: BBVs
As Gene has said, use separate charts :)
--
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: Gary MacIndoe [mailto:gary.macindoe@xxxxxxx]
Sent: Friday, April 08, 2005 10:02
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: BBVs
Hey George,
Thanks for your response. That's the way I created them, inside of the design.
The Fab drawing thing seems funny though: I know they are the same size drill,
but with the same drill symbol, looking at the figures inside of the board
outline, how can you tell the 1-2s from the 7-8s?
Thanks again!
Gary E. MacIndoe
PCB Design Engineer
Advanced Micro Devices, Inc.
Longmont, Colorado
-----Original Message-----
From: george.h.patrick@xxxxxxxxxxxxxx [mailto:george.h.patrick@xxxxxxxxxxxxxx]
Sent: Friday, April 08, 2005 9:59 AM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: BBVs
Gary:
We create them "on-the-fly" inside the database.
The drill symbols are the same, but the charts are created on separate layers
so it doesn't really matter (at least in 15.2).
--
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: Gary MacIndoe [mailto:gary.macindoe@xxxxxxx]
Sent: Friday, April 08, 2005 08:47
To: Allegro Forum
Subject: [PCB_FORUM] BBVs
All,
When you use blind and buried vias, do use set them up in the board database
from an existing regular top to bottom via? Do you create BBV padstacks for
your pad library?
I see in the padstack editor, Parameters tab, you can set the Type to
"Blind/Buried". I've tried to create a BBV padstack in the editor without luck.
What do you guys using BBVs do? Create them in the design or in your library?
Also, when creating the drill legend for the Fab drawing, if a 1-2 blind via
and a 8-7 blind via were created in the database from the same top to bottom
via (the same laser drill size in this case), the "figure" in the drill legend
is the same. Is this correct, or do you have different "figures" for the 1-2
and 8-7 same size drills?
Thanks for any responses!
Gary E. MacIndoe
PCB Design Engineer
Advanced Micro Devices, Inc.
Longmont, Colorado
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