On Tue, 26 May 2009 22:06:40 +0200
Petter Urkedal <[email protected]> wrote:
> > Second is the volumes we need to build in. We're ready to make 25.
> > We thought we could make just 25. We may still be able to make 25.
> > The first problem is in actually getting those quantities. Parts
> > suppliers don't want to sell in quantities less than 100, so we need
> > help finding ones who will. Buying them from Digikey is out of the
> > question, because there will be a 300% markup (making 25 cost more
> > than 100). Also PCB suppliers are reluctant to build in quantities
> > less than 1000, and assemblers are reluctant to build fewer than 100.
> > So we need help with these things.
>
> About the PCBs. Searching Google for "pcb prototyping machine" gives
> results for various devices which can create PCBs mechanically. I don't
> know if the quality is good enough for commercial products, or whether
> they can drill something like the OGD1 at all. But if they can do the
> job, it might be interesting for the open hardware community to have
> access to one these for producing small batches. The cheaper models
> seems to cost around $ 10 000.
The accuracy of those is usually enough to build double sided
PCBs with non or very few low pitch components. OGD1 on the
other hand has not only low pitch devices, but also high
pin count BGAs together with a high stack count. All three
are prohibitive for such milling type machines.
Attila Kinali
--
The true CS students do not need to know how to program.
They learn how to abstract the process of programming to
the point of making programmers obsolete.
-- Jabber in #holo
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