Re: gEDA-user: Metric units

[Steven Michalske <smichalske@xxxxxxxxx>]

Just a tip,  when working with mixed parts, i start traces from the  
pin, with snap to pin/pad on
and then have the miter take me back to the grid.

if connecting two parts  off grid but with miters that work with the  
gird, draw up to about the pin but just not all the way there  this  
will put a miter line on the grid and a line that your going to  
delete. ,  then undo the last line drawn and have it snap to the pad  
of the part your going to.  this will draw a short non grid unit miter  
and a trace aligned to the pin.

shift is also your friend,  PCB cant always get the miter the way i  
want it.

Hardkrash


On Jan 29, 2009, at 5:25 AM, Dylan Smith wrote:

> On Wed, 28 Jan 2009, DJ Delorie wrote:
>> But given that some parts (like SOJ or DIP) are specified in terms of
>> inch units, I think the whole concept of a "metric only library" is
>> rather pointless.  I think what the OP really wants is not what the  
>> OP
>> asked for.
>
> I wonder if PCB's internal representation using Imperial units has  
> been a
> problem. I thought it might present issues with some newer SMD  
> parts, like
> the 0.4mm pitch LQFP that I'm using in a project, but in reality, the
> layout looked fine and I didn't run into any problems with things not
> aligning correctly. (The real ballache is that my project has a mix of
> metric and imperial measured parts, like the imperial spaced SOIC  
> and SOJ
> but with metric LQFP and TQFP too, so I had to use a very fine grid  
> to get
> stuff to line up neatly for both metric and imperial parts).
>
> So basically, I've not had a problem myself and being able to make
> footprints in metric seems good enough so far.
>
>
>
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