I don't have Delta Cad but you might look to see if it can read/run script files. If it can, check out a freeware program available on http://www.cadalog.com/shareware.php called 'spiral.zip' (actually there are two programs called spiral.zip, you want the program compiled in C). It basically constructs a table file of points which, when run in autocad, are translated into polylines. I'm not sure the program will actually plot the type of spirals you require but with a spreadsheet and the proper math function you could probably generate a similar table that would. Just a thought.
A good source for math functions for 'spirals' is http://mathworld.wolfram.com/ , just search under 'spiral' once you get to the web page and you will get functions for lots of different types.
Hope this helps > Does anybody know how to draw a good spiral using Delta Cad? Or maybe
there > is some other program that will draw spirals (spirals can be drawn with > different parameters) and I can import the drawing into DC as a dxf or bmp. > The only way I can think of doing it on Delta Cad is mechanically. But this > is very tedious. (see photo. First draw concentric circles, then add > progressively longer radii from the center at the desired intervals around. > Then I connect the radii endpoints with a spline).
-
