Re: gEDA-user: Surface mount footprint pin pitch changes at different magnifications in PCB

[DJ Delorie <dj@xxxxxxxxxxx>]

Draw a board with an exactly 6x6 inch rectangle on it (either a solid
rectangle, or fat traces on a 6x6 centers.  Print that and measure the
actual sizes (edge to edge for rectangle, left side to left side for
fat traces, etc) and see if your print process is scaling it at all.

If the print is OK, laminate it to a board and re-measure.  You don't
need to etch, just laminate.  You can wash it off later and re-use the
board.

Based on these measurements, figure out the scale factor and put it in
pcb (I use ~/.pcb/settings for this) and print/laminate again, and
verify that they're the right size.

For my process, I have to scale things by about 0.4% to get it "just
right".


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