Eagle: X/Y offset in Excellon files

[oparr]

I notice that even when X/Y offset is set to 0/0 in the CAM Processor
there seems to be an arbitrary offset in the file X/Y coordinates when
compared to coordinates in the editor. It also seems to vary from
board to board. For example, a drill placed at 0,0 in the editor
(.001" grid) ends up at 135,135 (1/1000" units) in the file. One has
to use a -.135"/-.135" offset in order to get a 1:1 correlation. Why
is this?

 

[Chris Carlen]

oparr wrote:

I notice that even when X/Y offset is set to 0/0 in the CAM Processor
there seems to be an arbitrary offset in the file X/Y coordinates when
compared to coordinates in the editor. It also seems to vary from
board to board. For example, a drill placed at 0,0 in the editor
(.001" grid) ends up at 135,135 (1/1000" units) in the file. One has
to use a -.135"/-.135" offset in order to get a 1:1 correlation. Why
is this?

I've had this happen when I ran the Excellon output after putting fab
print marks to the left of and below the board's origin.

Solution: output Excellon before adding that stuff, or just put up with it.

I just put up with it, because all I really care about is registration
of the drills and Gerbers. As long as I process everything after
completely drawing the fab print, then it registers fine.

Good day!


--
_______________________________________________________________________
Christopher R. Carlen
Principal Laser/Optical Technologist
Sandia National Laboratories CA USA
crcarle@sandia.gov -- NOTE: Remove "BOGUS" from email address to reply.