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Re: gEDA-user: Thermals on Pads

On 1/31/2011 10:33 AM, Martin Kupec wrote:
On Sun, Jan 30, 2011 at 11:13:27PM -0500, rickman wrote:
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?
I would not argue against it.

So shall we change the code in a way, that older files gets current
calculation and newer ones has thermal specification in file?

This opens discussion how/what to specify.

	Martin Kupec

Is there a way to support both compatibly? If the data is to be specified, it will need to be stored in the design file. If that info is there, use it, if the info is not present let the software determine the values be used? I would think the only issue is determining a file format that would allow the info to be optional yet compatible with existing formats without the info.


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