Hello Steve,
I've noticed that some cad or drawing programs destroy drawings created in
Deltacad on opening them after they have been saved as dxf, notably
Turbocad, which makes one of your beautiful azimuthal dials look like a pile
of spaghetti!
However,
I have had  very good success saving as dxf using a free drawing application
called Autosketch (available for download on the web somewhere - try
www.autosketch.com ). It uses AutoCad compatible files, which are used by a
good number of commercial engravers in the UK; some plastic sign
manufacturers here have cad engraving equiptment which can be used for brass
or aluminium. If you can't get to deal with your engraver direct, send them
a full size accurate print of the drawing as well as the file so you can
have them check it is absolutely right before cutting.
Autosketch was a most useful way to get hardcopies from earlier versions of
Fer's Zonwvlak program, as it reads plt files. It's easy to use and you can
still edit the drawing and select individual lines with dxf.
File types supported: AutoCAD files (DWG and DXF); Drafix Port Files (POR);
Hewlett Packard Graphics Language files (PLT and PRN); AutoCAD Drawing Web
Format files (DWF); AutoSketch for Windows Release 2.0 and 2.1 files(SKD);
Windows Metafiles (WMF)

___________________________________________________________
*Extract from Autosketch Help on file conversions*
Copyright 1997 AutoDesk, Inc.

AutoSketch imports and exports AutoCAD Drawing Interchange (DXF) files and
exports AutoCAD's native drawing (DWG) files as Release 14 files. The DXF
filter reads all versions through AutoCAD Release 14 and AutoCAD LT 97. Two
DXF filters are provided when saving a file so you can create either Release
12/LT 2 or Release 14/LT 97 files.

When you import DXF (or DWG) files, AutoSketch ignores objects it does not
recognize (that is, objects that have no equivalent in AutoSketch). Entities
ignored on import include 3D Solid, Body, feature control frames, OleFrame,
Region, PolyFaceMesh, PolyMesh, Proxy, Viewport, and Shape. Similarly,
external references, applications, elevation (z coordinates), extrusion
direction, thickness, and XDATA are ignored on import.

The following conversions occur when exporting to DXF or DWG:

Dimensions are exploded into sub-entities so their visual integrity is
preserved.
  Hatches are converted to anonymous symbols containing the individual line
segments.
  Properties like pixel width are ignored.

The following limitation should be observed when creating files in
AutoSketch if you plan to export them to AutoCAD.  Especially if you plan to
bring the file back into AutoSketch.

Limit names to alphanumeric characters without blanks for layers, fields,
symbols, etc.
  Use only standard AutoCAD line types (styles) and hatch patterns.
  Do not use CAD vector fonts.  Use only TrueType fonts included with
AutoCAD equivalent SHX or TTF.
  Do not use pixel width for entities.
  Do not use fields assigned to entity types other than symbols.

Copyright 1997 AutoDesk, Inc.
_____________________________________________________________

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