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July 1998

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From:
PELCHAT_JM <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 31 Jul 1998 12:29:22 -0400
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     We use a mix of racks and carts.  The racks with vertical slots are used
     for post soldering and test operations since space is at a premium.

     These racks must be dedicated to the product line to alleviate constant
     adjustments.  We identify them with Customer and board number - the Product
     Engineer adjusts the top and bottom rails for height and parallelism (It
     must be the same width at each end of the rack or you end up with some
     slots being tight and some loose).

     Heaven help the assembly person who changes these adjustments!

     The racks are foam lined and have drag chains that contact the ESD
     flooring.  We also have foam trays that have angled edges so through hole
     components have clearance at the bottom.  I am unpopular in my opinion that
     these angled foam trays cause a lot of missing components.  (The leads of
     edge components get jostled and it's SUPPOSED to be the wave solderer's
     responsibility to check for that!)

     We handle a mix of boards that range in size from 4-6 square inches to 648
     square inches.  The much smaller boards are usually panelized prior to
     soldering operations and will be placed on trays.  Once depanelized though,
     we use hand held angle slotted racks and place them on shelves.

     Customer and product dedicated lines/equipment is the KEY to reducing
     handling defects!

     (My humble opinion)

     Jan


______________________________ Reply Separator _________________________________
Subject: [TN] PWBA Handling
Author:  Kenny Bloomquist <[log in to unmask]> at 0UTG0ING
Date:    7/31/98 6:53 AM


We manufacture a high mix of PWBA's that have a large range of sizes,
heights and weights.

We are looking for a better way to handle them to help prevent damage
during assemblies handling. This includes boards banging into each other,
components getting bent over and assemblies being dropped. We currently
have a large mix of totes with dividers, which seem to always have the
dividers removed, racks that hold multiple assemblies vertically, but they
are unstable and deform parts along the edges of the boards and individual
boxes with foam inserts that prevent seeing the assembly for identification.

It seems that adjustable racks always need adjusting, flat trays take up
too much space, and a special box for each assembly requires a warehouse of
storage space.

I have seen some clear clamshell boxes that look somewhat versatile but
can't find the manufacturer.

I'm curious as to what other people are doing that have a high mix of board
types.

Thanks for any replies.

Ken Bloomquist
Sr. Principal Process Eng.
PRIMEX Aerospace Company
<www.primextech.com>
Show Director for Northcon
<www.northcon.org>

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