Hi Francis and all,

  3 mils over 6 inches is huge!

Any changes in temp. & rel. humidity between the printing or inspection
environments?  Your film might be shrinking or expanding.  We have tight
tolerances for our inner layers +/- .5 mil on the artwork and were not doing
1 mil lines.

Does your photoplotter have air bladders?  It could be misprinting or the
rollers could be stretching the film.  (So says Patty, our design engineer
super-heroine.)

Hans

~~~~~~~~
Hans M. Hinners
Materials (& Process!) Engineer
Warner Robins - Air Logistics Center/Avionics Production Division
Manufacturing Branch (LYPME)
380 Second Street, Suite 104    (Building 640)
Robins AFB, GA  31098-1638
912-926-1970 (Voice) 468 - 1970 (DSN)  912-926-7164 (Fax)
mailto:[log in to unmask]


> -----Original Message-----
> From: Francis Lai [SMTP:[log in to unmask]]
> Sent: Friday, February 18, 2000 07:57
> To:   [log in to unmask]
> Subject:      [TN] Accuracy of film against CAD
>
> Hello :
> Can anyone tell me how accurate is the plotting of film against the CAD.
> I mean the accuracy of mylar film against the CAD. We are experiencing a
> 3 mil shift in a 6in by 6 in film. We are doing 1 mil line or gap with
> 0.25mil per edge, so accuracy is important to us.
>
> THANKS!!!!!!
>
> FRANCIS

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