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April 2002

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Subject:
From:
"Mark E. Schumacher" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 16 Apr 2002 15:58:01 -0400
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Dan,
Please fill me in.

Mark



                    "Dan R.
                    Johnson"             To:     [log in to unmask]
                    <[log in to unmask]       cc:
                    COM>                 Subject:     Re: [TN] Depanelization - Cracked Chip Caps
                    Sent by:
                    TechNet
                    <[log in to unmask]
                    RG>


                    04/16/02 11:35
                    AM
                    Please respond
                    to "TechNet
                    E-Mail
                    Forum.";
                    Please respond
                    to "Dan R.
                    Johnson"






Hi Earl & Steve,
I build assemblies which start at .5 X .5 and go down in size to .175 X
.175
with smaller stuff in development. There are two simple solutions to the
quandary of depanelizing these little $&%'ers. Most of our low volume stuff
is tab routed with tiny tabs holding them into the array, flush cutters
remove them. Higher cost but higher margin on low volume so that's OK.
High volume stuff goes out to the dicing service. I  also have a dicing saw
in house for medium volume stuff. You can pick up a used dicing saw cheap,
it doesn't need to be accurate enough for die, even a really badly aligned
saw can hold +/- .0005 over 5" of travel. The facilities requirements can
get pricy but you probably already have air and vacuum available, so all
you
need is  a re-circ/ chiller for the water. I kluged ours together out of a
stock tank and a sump pump (welcome to cow country).
My panels have standard tooling holes and sizes regardless of the unit size
so one size tooling fits all. Panels set up for dicing really maximize your
PCB yield since there is almost no waste, the saw kerf is .008 - .010", and
the cost of a service is less than labor to cut  the things out of a tab
routed array.
If you want to contact me offline I can but you in touch with a reliable
dicing service and a good used equipment vendor. Be careful of the guys in
silicon gulch, they have a lean and hungry look right now.
Dan

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