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Re: gEDA-user: Thermals on Pads

On 1/30/2011 4:47 PM, Martin Kupec wrote:
On Sun, Jan 30, 2011 at 04:37:17PM -0500, rickman wrote:
What geometry problems do you have?  There are plenty of references in
regard to thermals.  I don't recall seeing any other than bridges that
span a uniform gap around the pad.  The only variation I can recall is
the number and rotation angle of the pattern.   But most, if not all
that I have seen use four bars either along the x and y axes or at 45
degree angles.  I think there are even some built in commands for this
in the RS-274X Gerber file spec.

Or am I missing something?
We already do support bridges with rounded corners. And what we
do not support is anything suitable for TSOP package pads(long thin pads
near to each other).

But the big problem with you current implementations is the size of the
bridges. The size is somewhat magicaly calculated from the size of pin
and from the size of clerance. But this is neighter working nor probably

With big clerance the shape becomes completly bogus(at least for the
rounded versions).

That surprises me that the bridge width would be calculated rather than specified. What's the idea behind that? Isn't it a simple matter to let the designer pick the dimensions both for the width of the bridge and the width of the clearance?


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