Re: gEDA-user: Dsub15 HD

[Gabriel Paubert <paubert@xxxxxxx>]

On Fri, Nov 27, 2009 at 07:40:54AM +0100, Bert Timmerman wrote:
> Hi Anthony,
> 
> Anthony Shanks wrote:
> > Finally getting the hang of the footprint file format, here is a
> > footprint of a dsub 15 high density connector (Analog VGA) if anyone
> > needs it.
> > 
> > More footprints to come.
> > 
> > 
> > ------------------------------------------------------------------------
> > 
> 
> Congrats :)
> 
> Just a couple of notes for you to keep an eye on :
> 
> - ordering of pin numbers looks weird to me, this might bite with (your) 
> gschem symbols.

Indeed.

> 
> - I do not have a drill size 46.85 mils , or is this metric 1.189 mm ?

Metric. A fab will probably use 1.2 final (drilled larger and plated down
to roughly 1.2).

> 
> - pad diameter is 70 mils.
> 
> - annulus = 11.57 mils, is that large enough for hand soldering ?

Yes (it is the radius, not the diameter). Actually I've neer had
problems even when using the minimal diameter given by the fab.
But my solder contains lead, and wets really well, not the crap 
RoHS thing (which does even deserves the name of solder).

> 
> - solder mask hole is 65.06 mils, giving a -2.47 mils overlap with the pad.

Strange. I typically give 3 mils of margin to the solder mask (would 
give 76mil here). There are exceptions for BGA (soldermask defined 
landing pad), but that's not the case here.

I'd add that the origin choice is strange: not at  pin 1, 
not in the center. For my footprints, I always try to put
the origin at the geometric center (in this case this would
be in the middle of the second row of pins). I can see arguments
to put it at pin 1, but not where it is right now. 

> <ctrl><r>, and you get a popup dialog with values.
> 
> I for one always check pin dimensions in a text editor (with calculator 
> nearby as I live in the metric universe).

Me too, but my version of PCB reports dimensions in mm when the grid 
is set to metric. The only remaining problems is roundoff in some cases.

> 
> <note to devs>
> IMHO, it's is a major pitah that pcb doesn't allow for interactive 
> entering/changing these values in the popup dialog (that is present 
> values in entry boxes instead of text labels).

Seconded!

> 
> Maybe I should scratch that itch myself.

I encourage you.

> </note to devs>

	Regards,
	Gabriel


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