Dear David,
Thanks for your input.
>Make the silkscreen so much larger than the actual component that,
>when the silkscreen of neighboring components just touches (or overlaps)
For me, this approach makes sense because I can directly the area I need when
I place parts.
>I was just using the IPC-SM-782 Land Pattern Calculator
So was I, but I must be using it wrong because it never species the PLMT
GRID. Were you looking up a part or designing a land pattern?
>It told me ``PLMT GRID: 4x12'' for the component I looked up, which I think
>indicates a silkscreen of 2 mm by 6 mm.
That's how I understand the spec.
>But what does this mean ?
I think the Grid Placement Courtyard is intended to allow sufficient space
for the pick-and-place machine to place the part slightly in error and still
retain good solderability.
Steve Allen
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