I can't sketch anything smaller than about 100 nanometers. Is it normal ? As I wrote in an old thread "Modelling space size" :

*The format for floating points used in SW is the C >"double" format, which guarantees 15 decimal digits of precision. This means >the largest and smallest dimensions that can be added and still give a >correct result must not have a ratio larger than 1/10E15. If you want to >measure nanometers (1E-9 m) and still have some margin for geometric >operations, you can't allow dimensions much larger than 1E3 m.*

So I thought I could "easily" design sub-micron features, especially when setting microns, nanometers or angstroms in the document options, but it seems the workspace is "fixed" to a few cubic kilometers, limiting the resolution at the bottom of the scale... What limits sketching to 100 nanos while numbers would allow to go down to about 0.2 nanos ? What's the use of using angstroms as units if you can't use them ? Did I miss something ? For those who ask why I care : some swiss watchmakers model gears with a sub-atomic precision. The fact that atoms can't be cut in two flat pieces is considered as a machining error... Philippe Guglielmetti -