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1995

TechNet@IPC.ORG

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Thu, 17 Aug 95 15:03:55 EST
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          Chester:
               HADCO Corporation is U.L.-approved for up to 5 oz.
          cu./ft. sq. work, although typically these types of boards
          are processed through one of our Tech Centers.  As a matter
          of fact, certain niche type work fabricated in our Tech
          Centers has been as high as 10 oz. cu.!
               Although the assets are in place in our volume
          facilities and tech centers to do primarily multilayer work,
          we still do entertain work of a double-sided nature which
          does not involve high-running, long-term commitments.
               My big concern is the tape or film artwork.  We work
          strictly from electronic data, but when a customer has
          mature product, the artwork can oftentimes be scanned and
          digitized.  Most larger board fabricators use electronic
          data, usually Gerber but sometimes in other formats (DFX,
          etc.).  There are many design bureaus which can offer this
          type of service, and HADCO has worked with some in order to
          get the electronic data needed to fabricate a good, quality
          artwork.
               There may be smaller houses which can still accept tape
          or film artwork as part of the engineering package.
          Typically, because of the effects of heat and humidity on
          film or tape-ups, care should be taken to make sure that the
          film hasn't shrunk or grown, or some of the tape hasn't
          flaked.  Reproductions of reproductions of artwork may also
          cause problems such as peppering or undefined feature edges.
          Fingerprints and Exacto knives have also been known to
          degrade artwork on a film medium.  Another issue is with
          stepping and repeating the artwork onto the panel,
          especially with very small parts.
               I wish you luck in your endeavors.  If you need further
          assistance or information, please feel free to contact me at
          (607)687-3425, X 5215, or by E-mail: [log in to unmask]
          Tom Coyle
          Field Services Engineer
          HADCO Corporation
          [log in to unmask]



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