I found this when I tried doing components on a metric grid (e.g. 0.5mm lead
pitch PQFPs). I now have a calculator spreadsheet that gives me the
conversion to the nearest point on a 1mil grid for a given metric pitch.
The absolute error on any pad is below 0.0005" in each axis (worst case on a
diagonal is 0.00071") which doesn't cause any problems. It involves a load
more typing once for the symbol (especially on PQ240s!) but saves hours of
tidying up on each board as the router (still!) doesn't like pads placed at
non-integer imperial co-ordinates. There are still a few odd bits of
routing, but it's a lot happier.
I was reminded of this a couple of weeks ago when I did a new version of an
older board which had somehow got a load of pads at weird co-ordinates
(probably the result of a block move...).
Regards
Andy Gulliver
> -----Original Message-----
> From: Michael Schmitt [mailto:[EMAIL PROTECTED]]
> Sent: 08 June 2001 09:56
> To: Protel EDA Forum
> Subject: Re: [PEDA] P99SE Will we get a new autorouter for free ?
>
[cut]
> well my opinion is, it is about time that protel improves the
> autorouter. the more complex the boards is, the more i have to use finer
> grid the more time it takes for me to "clean" the result the autorouter
> gives.. the current version does realy creazy things with finepitch when
> entering or leaving the smd pads.
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