Gabriel Paubert wrote:
On Thu, Mar 08, 2007 at 12:39:42PM -0600, John Griessen wrote:
OK then, still on the pragmatic tack, why not use silk for a centroid
calculation? Find the most extreme corners of (silk OR pins OR pads).
What does OR mean in that context? The bounding box?
I was thinking of the centerline of the silk layer package outline.
I strongly suspect that, for example, pick and place machines want the
same centroid for SOT23 with 5 or 6 pins,
[jg]Ideally there's a point defined in the part datasheet that is good for
picking it up from with a vacuum tip, but in its absence, we can pragmatically
calculate a workable point. It maybe different from the exact center of the
flat spot on top of a molded package. It will be close though, so picking the
part up at its tape and reel centroid will only be off maybe... 5% of the
distance across a package...
So the first part-placing run will probably place all the parts without a total
miss and collision with nearby parts.
John Griessen
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