Just as general info - I went to the Library and made copies of the two
connectors, changed the holes to inches, and saved them under new
names.  Changed the part definition in the schematic and the layout
editor put the new connectors onto the layout for me. A few minutes
work actually - Eagle does have some nice features.

Roy

----- Original Message -----
From: "Olin Lathrop" <olin_piclist@embedinc.com>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Thursday, December 09, 2004 3:27 PM
Subject: Re: [EE] question for anyone on CADsoft EAGLE 4.11


> Wouter van Ooijen wrote:
> >> The problem is a mixture of measures (inches vs mm).
> >> My design is dimensioned in inches (0.001 actually) but
> >> one of the parts I got from the library has Metric (mm)
> >> dimensions, as I just discovered, on two mounting holes.
> >> This causes the EXCELLON generator utility in CAD to
> >> fail, since it can't find the 4 metric hole sizes in an
> >> otherwise US (inch) file.  If I reverse the .drl file
> >> parameter and specify mm it finds the four mounting holes,
> >> but fails because it can't find any of the 400 or so inch holes.
> >
> > Why not add the metric holes to the drill file (expressed in inches, of
> > course)?
>
> That solves part of the problem.  Everything will be in inches, but the
> board house may not be happy.
>
> You have to know up front whether your board house will do holes in inches
> or mm.  Most will do inches, or if they use mm will convert automatically
> from the inches values.  Except Olimex that is.  They don't seem to know
how
> to multiply by 25.4, and are rather uppity about it.
>
> I specify all my holes in inches from a limited set of "standard" hole
> sizes.  Even when making a library part that is specified in mm, I find
the
> smalles inch-scale drill size that meets the needs.  This is what most
board
> houses want anyway.  The metric board houses (except Olimex) will usually
> substitute a mm equivalent within the tolerance.  You should generally
> assume that your finished hole size will be +-.004 inches off from what
you
> specify.
>
>
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