Paul, try three. the export tab in autocad is where to save to many file
types. I chose autocad14(dfx.)  I clicked the file and it auto opened in
true-view2009 which must be installed on this computer. I tried rhino
version 1. The file symbol in upper left corner then select file type to
autocad14dxf from the list and it opened. the view " top" seems to be the
plan view and since this is a twoD working drawing that seems right. text
doesn't translate in other views. I didn't set the circle performance
numbers from the default and it is readable, just not as smooth on the
lines.What is left is the various cross sections up through the core engine
in true scale. I will be extruding, revolving etc these into 3D solids and
joining/filliting the solids for the solid model shortly.As usual no rights
reserved,  anything helpful to anyone is available. this drawing has most of
the mazda engine parts to scale as well as RWS  RD-1B mounting plate with
the coordinates in decimal degrees translated from polar coordinates from
the newsletter last month.The stock side housings were deleted off this
drawing and the rotor was never drawn. Also the e-shaft between the
eccentrics is approximate not to scale.The tension bolt locations were
measured by dial caliper and the expected tolerence is on here somewhere.
Enjoy oshkosh, I have family visiting and can't get there.

george grimes

The dxf file did not load. It appears it was not a vector dwg.
The error message was un supported data type raster image.

I am afraid the 3D world has moved away from autocad.

ACAD kept shooting them selves in the foot year after
year making file type after file type incompatible
with the previous year's file type.

Paul Lamar

2D Qcad loaded it and here are what the screen shots look like.
I appears that section dwgs are a crude tool compared to 3D dwgs.

Here is what a Solid Works 3D part looks like. All dimensions
are embedded in the part dwg file.

Paul Lamar