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.

  Paul Lamar

 Paul...

 This probably isn't any help as you've already identified it as a raster
 file, but I was able to open it in Irfanview.  Irfanview will attemp
 several different formats if it doesn't recognize the extension.

 The image appears to be a very low resolution shot of an upside down
 program...with the drawing, whatever it is, scattered around.  It
 appears to be a bmp or some such, as Irfanview had no trouble
 translating it.

 It may be helpful if it can be used to show George what he's sending...

 Harley

 Paul the drawings are twoD at this point because I need to  relate all the
 cooling passages, oil circuit , bolt locations  and mazda parts into as
 compact a size as I can get, and keep relocating and removing metal here and
 there  to get the weight out of it without  violating the integrity of the
 separation of oil and water defined by possible o-ring locations.


Simultaneously the draft of the patterns both inside and outside  from top
 and bottom must allow the pattern to be pulled from the molding sand and
 avoid transitions in section modulus which could weeken the casting as it
 solidifys or produce hot tears during the metal solidification. For me it is
 easier to look through all the layered sections in a stack leaving out
 layers not in the area being worked on and when the puzzel is worked out
 then just extrude the layers with the pattern draft and join the parts into
 the solid.


The pattern solid can then have the machined surfaces removed
 with the slice command and bolt holes added to the remaining solid which
 will be the actual part. Then the g-code translater can machine the finished
 parts. I get to the stage of a rendered solid but rarely in the design
 stage. I have tried working with the 4 panes in 3D but entering 3 cartesian
 coordinates and editing points from the 3 windows  with filters  is much
 slower and to me confusing.


Many times I don't have the third coordinate
 because there is not a finished part to measure or digitize. When I get to
 the rendered views like your sample I will send them along. I expect to be
 finished with the core engine in twelve weeks and started on the patterns on
 my cnc router. making patterns is quick, figuring out how to run the router
 is unexplored territory. Anyway, glad we got  something to
 transfer,



george-grimes


You need to try Rhino George. It does everything you want it to
do. http://www.rhino3d.com/ The user interface is very much like ACAD.

Here is an end housing I did in Rhino.

Paul Lamar