November 6, 2005

Hi Steve, it was nice talking to you at the WORKS conference.  As you probably are aware, the PWA's you make for DRS-M have a higher level document (MIL-C-23200) invoked than J-STD-00 or IPC-A-610.  The MIL-C-23200 document mandates that if a part specification mandates that part marking be permanent, then no subsequent processing (e.g., cleaning, soldering, etc.) can cause the markings to be obliterated.

The problem you are having is not unique.  We have other folks who are having the same problem.

The only option I am aware of is for you to determine if the specification for the part requires the marking to be permanent.  If so, then obtain corrective action from the part manufacturer.  Other option would be to add a label or otherwise mark with the missing information.  Other option would be to disposition as a nonconforming condition for DRS resolution.  

I have had several discussions/arguments with the IPC regarding marking requirements in 001 and 610.  I maintained that important markings such as the P/N, polarity markings, reference designation markings and markings that designate the part has been electrical screen tested should not be obliterated by any processing method.  I have always lost the argument.  That is why we mandate no loss of these type markings.  
  ----- Original Message ----- 
  From: Steve Gregory<mailto:[log in to unmask]> 
  To: [log in to unmask]<mailto:[log in to unmask]> 
  Sent: Friday, November 04, 2005 10:04 AM
  Subject: [TN] Component marking on metal parts...


  Happy Friday All!

  We've got a rather irritating problem here that is starting to become more
  than just
  irritating, it's become a real issue. It has to do with part marking.

  J-STD-001 states:

  9.2 Marking Assembly identification such as part numbers and serial numbers
  shall
  remain legible (capable of being read and understood) after all tests,
  cleaning and
  other processes to which the item is subjected.

  Additional markings (such as labels added during the manufacturing process)
  should
  not obscure the original supplier's markings.

  Individual component markings, reference designators and polarity
  indicators should
  remain legible and components should be mounted in such a manner that
  markings
  are visible.

  The only parts that we have a problem with are metal parts such as hybrids
  or DC\DC
  converters. We clean with Kyzen and have a real problem with the markings
  coming off
  in wash. We try to protect them with a piece of kapton tape, but that only
  works hit and miss.
  Does anybody else have the same problem? What have you done to protect the
  part
  markings?

  Kind regards,

  -Steve Gregory-
  Senior Process Engineer
  LaBarge Incorporated
  Tulsa, Oklahoma
  (918) 459-2285
  (918) 459-2350 FAX
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