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A Splined line just leaves too much to the imagination of the original designer who set it up, and doubtfull can be duplicated twice accurately.Wondering how to get to Deltacad in Compiègne, France? Moovit helps you find the best way to get to Deltacad with step-by-step directions from the nearest public transit station. In most CAD situations, if you take a hard look even the curves of a elipse are made up from little segments. I could see using the option "Fit Curves" with polylines, which in the instance of cutting airfoils, and moreover connecting straight lines to multiple radaii curved segmants. I also cannot think of a need for splined lines on a CNC machine. I use one of the cheap-o freebie versions of Autocad DXF to G-code that I obtained via It only works with curves and straight lines though. I have troubles in that the automatic fillets in Autocad get converted to one long secant in the DXF process, and thus have to go back and fix all these on earlier versions. This will mean that those splined lines do not have perfectly fitting endpoints, and any interpretation is possible, as you found. Thus an end coordinate which used to be X=16.0000, Y=14.5000 in DeltaCAD came out as X=16.000000000, Y=14.50000000 in Autocad, and in translating backwards to an earlier version gets to be X=15.9999 Y=14.4999 which is within your needed accuracy, but not to the fickleness of CAD. In transferring back, you do not get a repeat of the original, but yet another interpretation which ought to be readable in Deltacad. The only situation in all this is that the newer software, as mentioned, interprets your older drawing to fit their needs. In Intellicad by Visio, they have a converter which will enable you to save drawings back to version two of Autocad.
All your noted software versions may be operating under the DXF for R-14 standard. (They bleeped this out with the last version of R-14).Try the earliest. Depending upon how new of a version you obtained, there should be a setting which indicates to export file in DXF to R-14, R-13, or R-12 standards.
On my version of R-14 there are ways to set out a back dated DXF file. Now, to go backwards to a cruder system which has accuracy to six places, it may not understand the excess digits in the files when being read. A new drawing origin is assigned to the imported file, the endpoints of the lines calulated to ten places etc. This usually means coordinates for new systems go to ten places whereas, on the older computer systems and software to six places was good enough. When you import the older DXF file into a late model software, it gets analysed and curves and straight lines (and text) get interpreted befitting of the newer software language. The DeltaCad software was probably designed up with to the standards of the day, but a cruder element than that used now. and you have to think back into the mode of CAD and plotters of the 1970's. A splined line is not recognized by DXF, nor are SOLIDs or DONUTs, or TrueType fonts, etc. Your splined polylines are attempting to return to their original elements. To cut the small curve appropriately, you need to go to a finer setting of 100 to 400 steps per inch. If your machine was set up to eight, and you only cut materials with straight edges and maybe 2000 inch radaii curves, it would be cut quickly and the crudeness would not be noticed untill a little 1/2" curve was cut. The difference here is in the desired end product to the application. The fineness of the line segments is based upon software settings, usually stated in "steps per inch".
A drawn curve if examined microscopically is full of tiny line segments.
It really only handles vectors of straight lines. I stress this to many folks who purchase CAD systems, in that they first compare compatibility with all possible uses to determine the needed output matches the desires.ĭXF is a rather crude language.