> I agree the rounding errors in Protel PCB between metric and imperial are
> really annoying, making things fall off grid. Many a time I have editted
a
> pad/part/track when I see 29.999999mm and think "Hey this should be 30mm"
> and accidently go and edit it to 30.9999999mm. Grrrrrrrrrrrr.

I just tried setting all the vias on a DXP PCB to 0.30000mm. It then
displayed 0.3mm and after closing and opening the file it still said 0.3mm.
I then changed another pad from 3.048mm to 3.03mm. Closing and opening and
it still was 3.03mm. I then went to english mode and changed it from
119.291mil to 119.290mil. Going back to metric still gave 3.03mm. I can't
seem to duplicate the this problem in DXP. I even tried it with a line 30mm
long.

I am also wondering how much of a problem this is with the dimensioning
tools having setable decimal points and gerber files having a highest
resolution of 0.01mil or 0.0001mm. I just haven't noticed this as a
problem, or am I missing something (besides the brain cells I lost in
college). I have noticed that the DXP memory router will not recognize a
pad as being memory routable if it is 0.001mil off grid from the other
parts.

Rob







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