You are also dealing with polyester film which is hydroscopic, as well as
sensitive to temperature change. This stuff is not dimensionally stable.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Scott Westheimer
Sent: Friday, January 17, 2003 11:01 AM
To: [log in to unmask]
Subject: Re: [TN] PWB artwork


Steve,

If you received the artwork from the same company that manufactured the
boards it sound like they sent you a copy of their working film which as
been scaled for material movement.
You need non-scaled directly from Gerber's that you sent in.

Scott B. Westheimer
General Manager,
Gultech North Carolina
5800 McHines Place
Raleigh, North Carolina 27616
Phone: (919)872-0100
Fax: (919)713-4849
Cell: (919)649-1510
Toll Free: 1-866-gultech
[log in to unmask]
Web Page: www.gultechna.com
----- Original Message -----
From: "Steve Vargas" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, January 17, 2003 10:51 AM
Subject: [TN] PWB artwork


> Technetters:
>
> Can someone tell me what the requirements are for PWB artwork stretch? I
> have a 12" long board where the artwork appears to be about .004" longer
> than the data from the gerber files. This is causing us much heartache
> during our screenprint process. As you would expect, it is also causing
> problems with 0402 tombstoning and fine pitch soldering as well. I could
> not find this in IPC-A-600. Thanks.
>
> Regards,
> Stephen M. Vargas
> Polaris Contract Mfg. Inc.
> [log in to unmask]
>
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