tobs said:The selection of the units is also a kind of selection what accuracy you need.
selecting MM,MILS,UM (micrometer) and the appropriate amount of decimals will give you either a smooth working or all the time a lot of rounding errors which can impact your work a lot.
for instance working in Allegro with MILS and 4 decimals will all the time you do an autovoid of shapes give you nice results, Allegro is converting every X/Y location into an internal database value (independent of MIL,MM,UM) wich cause very often round off errors...
Tobias
cozkan said:mils is so standart because of all components sizes and pins are related mils.
cyberrat said:I use MM for placement of critical items, such as board outline, mounting holes etc so as not to get wrong values as the mechanical drawings are all in mm now.
I also use MM when creating a footprint (unless the spec is only in thou).
Then I use thou when placing and routing.
As for the industry moving over to MM, oh yeah, like I'll believe that when it actually happens. Just because industry stds want us to does not mean that we will.
LONG LIVE THE INCH!!!
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