gEDA-user: Illogicality in PCB?

[Karel Kulhavy <clock@xxxxxxxxxxxxx>]

Why the PCB data files have copper-to-copper clearance expressed in
copper-to-copper clearance and soldermask-copper clearance in mask
diameter or width and not also in copper-mask clearance? It seems illogical
to me.

And what is typical for the manufacturing process is the copper-mask clearance
and not mask diameter, which is changing with each change of copper width or
pin diameter.

What is even confusing to the user is the fact that after
ChangeClearSize(SelectedPads, 14, mil) the "Object report" says
"Clearance width in polygons 6.99 mils"

I would at least expect the number fed into user commands be the same
as reported.

No, reported numbers may be multiplied by a random factor F where F=G/H, where
G and H are small natural numbers

Cl<