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



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