Just a few additions to Ed's thought...
>>> Ed Cosper wrote: <[log in to unmask]> 01/14/98 01:04pm >>>
>Ken,
>I guess the question I would have to ask is why would you put this on your drawing?
Ditto, Is this a way of verifying the gerber data you gave them is correct?
>Typically the board manufacturer will manufacture the parts according to the tooling
>provided. If you place thermal on your artwork or Data, then they should be there when
>the parts are delivered. If you don't, then they wont. Are you wanting to place this on
>your drawing as an instruction to the board shop to insure you have not made a mistake
>in your design or lay out the CAD data.? In any case, regardless what you decide,
>the manufacturer is obligated to meet your drawing requirements but I don't feel you
>should expect the board shop to be totally responsible for detecting supplied design or cad errors.
Big Ditto! I can see your situation, F you happen to be working with multiple vendors whom
you're not completely satisfied with, OR you have no idea who might be making your boards,
but hopefully you know whom you're dealing and know what they CAN do with your data.
If not... GET INVOLVED. I have worked with numerous board houses, and have always
defined MY OWN minimal fabrication requirements (plus calling out the IPC-RB-276 spec as
the general requirement), and have had GREAT success.
I'm not saying not to do it your way, but how much of what you currently call out on the
drawing(s) is already a duplication of the minimum requirements of IPC-RB-276 or whatever
spec you ask the board(s) to be fab'd to?
Best of luck,
>Ed Cosper
Director Quality Assurance and Engineering
Graphic Electronics Inc.
----------
From: Ken Patel[SMTP:[log in to unmask]]
Sent: Wednesday, January 14, 1998 1:13 PM
To: [log in to unmask]
Subject: [TN] Thermal Relief at Ground/Power Plane Connections
Friends over the world,
Is there any problem spelling out "ALL GROUND/POWER PLANE CONNECTIONS SHOULD
HAVE THERMAL RELIEF " on my fab drawings.
Please provide me pros and cons before I make a call.
Your help is greatly appreciated.
re,
ken patel
______________________________________________________
Ken Patel Phone: (408) 490-6804
575 Cottonwood Dr. Fax: (408) 490-6859
Milpitas, CA 95035 Beeper: (888) 769-1808
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Mitch Morey
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