We regularly output DXFs at 1:1 scale for a CNC router, and
found that certain arcs were converted to polyline segments in the
DXF export when using SW 2007.
This is not acceptable for our CNC router, as the change of
direction at each segment corner causes the cutter to stop &
I reported this to my VAR who sent it on to SW
This is the SPR:-
SPR 353664 - If arc size is bigger than 500, exporting it as DWG or
DXF in scale 1:1 will get multiple segment polylines.
As a interim solution we have changed our DXF out drawing template
to use metres as a unit, instead of milimetres. This allows the
larger radiuses to output correctly (as long as they are smaller
that 500m rad!)