On 12:08 PM 1/08/2002 -0400, vincent mail said:
>John Ross wrote:
>
>>Metric or Imperial does not make any real difference (except individual 
>>preference) except when having to convert.
>yep agree
>
>>I think the point is that Protel has never handled Metric properly due 
>>to, what I assume is shoddy conversion due to database limitations. 
>>Metric support in the SCH for rules definition was skipped altogether 
>>until DXP (NOT).
>>
>>Not all imperial values do work out to round numbers due to the generous 
>>tolerances that manufacturers apply to their values in data sheets. Try 
>>measuring a 20 mil (0.5mm) device and see!
>>What is missed in the argument is that we will have rounding errors 
>>either way unless the s/w and/or database supports BOTH systems equally 
>>or not at all, and that includes the rules system.
>well there isn't a real conversion to start with . most people say that 
>25.4 millimters equals an inch , that is if you round it yes. i seem to 
>recall the ral number has lake 5 or 6 digits behind the comma. and then 
>you get into floating point problems.


25.4 is exact by definition - hence the advantage in the base unit being 
some small fraction of a mm.
http://lamar.colostate.edu/~hillger/everyday.htm

Ian Wilson


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