Hi Ted,

The IPC Documents are intended to be guidelines. While you may have drawn the panels perfectly per the IPC documentation, many fabricators will panelize per the size of panel that they need, the optimum use of the material, and the material size they have on hand. This is intended to save you money. While you are correct to be concerned about any changes that are made, this was probably done by the fabricator rather than the assembler. They should ask before they do it, but some shops don't. Why don't you ask them for documentation as to what all changed and inspect that documentation carefully.

And definately talk to your fabricator and assembler. While the IPC documentation is the perfect place to start, it is not the only correct way to do things. The shops may both be able to explain any changes they made and why, and give you guidelines that you can use for your future reference with those shops. Also explain your concern to them that no changes ever be made without your permission.

Good luck,
Susy


>
> From: Ted Tontis <[log in to unmask]>
> Date: 2004/12/29 Wed AM 11:17:50 CST
> To: [log in to unmask]
> Subject: [DC] Assembly panels
>
> The data package that I sent to our assembly house was in a three board assembly panel. I used the IPC standard for choosing the size of the panel. It was a panel 260mm x 180mm containing three boards. I talked to the assembly house yesterday and was notified that the assembly panel size was changed. There are still three boards in the panel, however the bare board manufacture decreased the size of the assembly panel. First question I have is per IPC-2221 5.2.2 Figure 5-1 I picked the correct size for the panel, optimizing the manufacturing panel? The second question is that in my notes "no changes where to be made to the board without first receiving written permission of us." This now leaves me with a question mark over my head what else was changed without me knowing it. Should I confront the Assembly house for not following my notes? Have other designers faced similar problems and what was your course of action?
>
> Regards,
>
> Ted Tontis CID
> Engage Networks Inc.
> 1320 N. Dr. Martin Luther King Drive
> River Level
> Milwaukee, WI 53212
> PH 414-918-4267
> FX 414-273-7601
>
>
>
>
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