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August 1998

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Subject:
From:
Chris Chapman <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 6 Aug 1998 14:51:45 -0400
Content-Type:
text/plain
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text/plain (122 lines)
Datum Dynamics has been manufacturing Inspection Templates for a number of
years, which overcome your problem. These are designed from the Gerber silk
screen and solder mask layers. Made from 1.6mm thick FR4/G10 the templates
drop over the populated board and can be engraved with suitable text.
FR4/G10 is much more durable that a laser plot onto film, and does not
damage components, as would a laser cut stainless foil. If you require more
information, please email me or phone (401) 683 5300.

Regards,
Chris Chapman

-----Original Message-----
From: [log in to unmask] <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Thursday, August 06, 1998 2:32 PM
Subject: [TN] Re[2]: <no subject>


>     We are currently soliciting DESC to allow the cathode to be twice the
>     size (as it is only a butt weld to the case) to accomplish this.  It
>     may take months for approval.
>
>
>______________________________ Reply Separator
_________________________________
>Subject: Re: <no subject>
>Author:  [log in to unmask] (PELCHAT_JM) at CCGATE
>Date:    8/6/98 10:24 AM
>
>
>        This is an issue that PLAGUES the industry.  We have in use the
>        following:
>
>        Automatic placement equipment
>        Polarity overlays
>        ICT
>        Visual inspection
>        Critical Item Inspection lists  (pointing out cautions to the
>        inspectors)
>
>        And STILL we have reversed components due to:
>
>        Hand placement of components (even with auto equipment, there
>        appears to be an incredible amount of hand intervention due to
>        machine mischucks, reel changes, etc)
>
>        Small lots - this causes purchase of some component in other
>        than a reel which bypasses AUTO equipment.
>
>        Tape and reel errors from suppliers/in house T&R
>
>        Operator error
>
>        If ANYONE can improve on these processes, let me know.  I would
>        be a miracle worker in my company!
>
>        Jan Pelchat
>
>
>______________________________ Reply Separator
_________________________________
>Subject: <no subject>
>Author:  [log in to unmask] at 0UTG0ING
>Date:    8/6/98 8:24 AM
>
>
>     Hello,
>
>     I am interested in a solution to installing tantalums in reversed.
>     Plus symbols, silk-screen marking, etc. have proven inadequate.
>     Failures come after many hours of reverse polarity in some
>     applications.
>
>     Are there any ideas on how to physically or otherwise prevent this.
>
>     Thank you, Rich.
>
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