As my Grandfather used to always tell me "Necessity is the Mother of
Invention."
MOOOOO

----- Original Message -----
From: Dan R. Johnson <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, April 16, 2002 11:35 AM
Subject: Re: [TN] Depanelization - Cracked Chip Caps


> 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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