> Hi Geoff,
>
> thanks for your answer, is just I was wandering what would be the strategy
> for joining internal planes?
>
> Dan Klepper
An "off the cuff" answer is to place polygons on the Power Plane layer whose
associated (boundary) tracks' thickness are so small (like 2 microinches)
that these will not be reproduced in the Gerber file produced from that
layer. Those "anaemic" tracks (integral to the polygons concerned) should
then be supplemented by respectible-thickness "free" tracks, on the same
layer, that co-incide with the locations of the polygons' tracks over nearly
all of their locations, *except* for the area where the two nets are to be
joined.
In other words, the polygons implement the distinct nets on a
theoretical/"official" level, while the "free" tracks implement the distinct
nets on a practical/"real" level (except for the small gaps where you want
to join these nets for real). (Remember that power plane layers are negative
layers, so copper is *absent* from areas where primitive objects are placed,
and present in remaining areas.)
There might be better ways of doing this though, and I have never attempted
this suggestion in practice. Others may have better ideas, and given
sufficient time, I might be able to come up with something better myself.
But you may want to try a bit of experimentation, to see how my idea checks
out in practice. (Use a Gerber file viewing utility, like GC-Prevue, or
Camtastic (provided by Protel to all owners of Protel 99 SE), to preview the
Gerber files produced from the PCB file.)
Regards,
Geoff Harland.
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