Create spline nx2..torx head

[jbdesign]

I am trying to create a spline representing the top of a torx head screw, where torx tool will fit. I would then extrude. This will be where tool will be inserted.
We recently went to nx2, having great difficulty. help

 

[cowski]

For torx heads I found this:

http://www.standards.com.au/PDFTEMP/Previews/OSH/iso/updates1999/sept/C018755e.pdf

It gives some limiting dimensions, but the dimensions of the small and large arcs are unspecified. Anyway, to draw it I would pick a size for the small arc and array it around then do the same for the large arc. Trim as necessary and use the geometry as is; if it really needs to be a spline you can 'join curves' at this point.