[PCB_FORUM] Re: how do YOU handle component spacing rules?
- From: george.h.patrick@xxxxxxxxxxxxxx
- To: icu-pcb-forum@xxxxxxxxxxxxx
- Date: Mon, 7 Jun 2004 11:37:44 -0700
Gene:
Just curious, what tool has that built in?
There is "Design for Assembly" tool in Allegro (Manufacturing > DFA Check),
but I have never used it to comment on how well it works, and I don't think
it is a real-time check.
FWIW, we use Valor to check our component spacing.
--
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.pcb-designer.com
It's my opinion, not Tektronix'
-----Original Message-----
From: Gene Carman [mailto:gcarman@xxxxxxxxxxxxxxx]
Sent: Monday, June 07, 2004 11:30
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] how do YOU handle component spacing rules?
Is there a way to set a component type to component type rule? What I =
mean is that certain component types tend to have different rules... =
such as 0402 to 0402 verses 0402 to SOT or BGA.
The only rules I have found are pad to pad... which does not allow for =
different type rules.
I spoke to some other designers and they offered two solutions: One is =
to build visual indicators into the parts so you can tell if your 0402 =
is too close to another 0402 or BGA... great, no DRC there. The other =
solution is simply use grids and place them... again no DRC.
I have different customers that require different spacings. One =
customer wants 20 mils between 0402 pads, another wants 25. Customer 1 =
wants 50 mils between BGA and 0402, customer 2 wants 40 mils between BGA =
and any other comp. =20
With other tools I had the ability to assign components to a component =
type and then assign rules of type to type. I don't see a way to do =
that in Allegro (15.1) (very similar to net type rules in Allegro, for =
component to component spacing)
What do you do?
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