> -----Original Message-----
> From: piclist-bounces@mit.edu 
> [mailto:piclist-bounces@mit.edu] On Behalf Of Bob Axtell
> Sent: Sunday, February 19, 2006 8:22 PM
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] Metric units
> 
> Olin Lathrop wrote:
> 
> >Tomas Larsson wrote:
> >  
> >
> >>Imperial is a pain in the arse, when it comes to PCB design.
> >>It seems that most editors has imperial units as base units in the 
> >>database, and that creates round-off problem when working in metric.
> >>Since most Chip manufacturers is moving from imperial to metric it 
> >>creates a problem.
> >>    
> >>
> >
> >All CAD where I've looked into this use an integer 
> representation that 
> >is a sub-multiple of both mm and mil.
> >
> >
> >******************************************************************
> >Embed Inc, Littleton Massachusetts, (978) 742-9014.  #1 PIC 
> consultant 
> >in 2004 program year.  http://www.embedinc.com/products
> >  
> >
> I've never encountered a rounding probem either , even good 
> ole DOS Tango could go to .01 mm without any problems...
> 
> Most genuine CAD programs use a very deep math unit
> 
> --Bob

In My experience, the problems do apear when you have to switch between
metric and imperial, and use both system in the same database. 


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