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July 1998

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Subject:
From:
"Cash, Alan" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 31 Jul 1998 10:47:08 -0400
Content-Type:
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   Don't forget that the carts must be ESD protective or you will be
constantly reworking for blown components.

      Al Cash

> ----------
> From:         Stephen R. Gregory[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;[log in to unmask]
> Sent:         Friday, July 31, 1998 10:37 AM
> To:   [log in to unmask]
> Subject:      Re: [TN] PWBA Handling
>
> In a message dated 7/31/98 6:53:20 AM Pacific Daylight Time,
> [log in to unmask] writes:
>
> << 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>
>   >>
>
> Mornin' Ken,
>
>      I know what you're talking about. I've worked mostly in contract
> assembly
> companies here in silicon valley, and there's always a high mix of
> boards on
> the floor. The killer ones are the 18" X 20", 14-layer, $2,000 bare
> fab,
> $7,000 loaded ones...after you have to buy one or two of those jewels
> from
> dropping them and breaking a corner off, you start looking real hard
> to come
> up with a better way.
>
>       What I found that works wonderfully, is the type of carts that
> handle
> trays. Bliss Industries is one of the first ones that came out with
> them, but
> I've seen a few other companies like Metro use the same concept. It's
> just a
> cart that usually has 50-60 slots to handle conductive foam lined
> trays...they're great. A little on the expensive side (start at $1,000
> with
> trays), but when you look at the price of a dropped board,
> ehhh...they're
> cheap.
>
>      At the first company I got them at, I modified the movable rail
> on the
> PTH slide line to open up a little further so we could use them right
> on the
> line...that way it simplified the handling of the completed board from
> the
> slide line to the cart that would move them to wave solder. Another
> benefit of
> the trays is when moving unsoldered assemblies like that, is that with
> slotted
> adjustable racks you can lose parts going across seams in the floor,
> but with
> trays that's nearly impossible. With tilt racks the boards need to be
> within a
> certain size...not too big, not too small...and the boards can't have
> any
> components close to the edges of the board, otherwise they run the
> risk of
> getting knocked of...you eliminate all those issues with trays.
>
> I hope this helps,
>
> -Steve Gregory-
>
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