Re: gEDA-user: powermeter board, with less ground planes :-)

[Steve Meier <smeier@xxxxxxxxxxxxxxxxxxx>]

Inspection is moving to aoi automated optical inspection and flying
probe test. Speaking of which the Flying probe test needs locations of
pads and vias and are used to the pad's ascii style file. I have
actually made a lot of progress importing a pads ascii file into pcb and
once I can read the entire file (i am down to the netlist) I plan on
working on a conversion script from pcb to pad's just to support the
flying probe.

I was visiting an assembly shop checking to see if they can load an 8
mill pitch flip chip for me today. I do like looking at their toys.

Steve M.

On Fri, 2008-10-31 at 20:58 -0400, Bob Paddock wrote:
> On Friday 31 October 2008 08:40:44 pm Steve Meier wrote:
> > If having to switch between nozzles is a significant issue then there is
> > room for a new pick and place equipment company that builds a
> > multi-nozzle tool.
> 
> They do exist of course, but there maybe other reasons why
> they can't be used in a particular machine load.
> 
> > In reality, I doubt that it has much of an effect on 
> > cost.
> 
> I have known it to cause a board to require two complete
> passes through the machine, or the worse case of two different
> machines.  One pass for the "big stuff" and one pass for the "small stuff".
> 
> > I wonder how the throughput of the pick and place tool compares to the
> > throughput of the reflow oven? or wash or final inspection?
> 
> Depends on the equipment, your process set up, and the board.
> 1000 part board is going to take more time to load and inspect
> than a 100 part board, while reflow and wash hold the time more or less
> constant for either board.
> 
> 
> 
> 
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