kicad-developers team mailing list archive

[jean-pierre charras <jp.charras@xxxxxxxxxx>]

Le 03/07/2012 17:16, Dick Hollenbeck a écrit :
> On 07/03/2012 05:09 AM, Carl Rash wrote:
> > Dick,
> > The diameter of the hole and the diameter of the via pad are correct
> > (verified with 3rd party gerber viewer), 0.015 and 0.025. The problem is the
> > hole is off center. I believe this code in gendrill.cpp is selecting the
> > size of the drill and that is correct. It may be that placing a hole within
> > one half a mil is not possible using the NC format if that is the case then
> > I would have like to have it detected at the DRC phase and not after
> > submission to the PCB fabrication house. Perhaps a minimum annular ring test
> > would be a good DRC check.
> > I am going to try and change the next grid hot key to a combination like
> > Ctrl+G that way It will not be likely that I can inadvertently change grid
> > size without knowing it. I have never used auto routers, I prefer to do it
> > myself so I depend on the grid staying where I set it.
> >
> > Thanks for time
> > Carl Rash
>
> Is there actually a bug here?
>
> It is sounding like a user error, not a true bug.
>
> It is fully understandable that you do not like the current functionality, which might be
> validly classified as something other than a bug.


In fact, this is a truncating issue in Excellon drill file, not an actual bug in pcbnew.
The coordinates were truncated to 3 digits after the decimal point,
giving a 1/1000 mm resolution when the file is in mm (this is the max resolution allowed in Excellon files),
but only a 1/1000 inch resolution when the file is in inches (The max resolution allowed in Excellon files is 1/10000 inch)

This is not related to nanometer version, and, I am thinking, was a very old behavior.
This truncation can be seen only for some grids like 2.5 mils, but there is no bug inside Pcbnew.

I fixed it, and just committed the fix
(For Excellon files in inches, the max number of digits is now 4, that is the full allowed resolution).




--
Jean-Pierre CHARRAS