... DXF file contains only the numbers, it doesn't contain any indication of what units the numbers represent. This means that when working with DXF files it is necessary to set the required units in both the exporting and importing programs -- normally the same units for both. That's why Templot puts a note of the units in the default file name for reference. When importing a DXF file into TurboCAD, click the Setup button on the TurboCAD file dialog, and then set the units to match the file before opening the file: 2_160524_310000000.png However, looking at TurboCAD DeLuxe 20, that option appears not to be available in the file setup. Instead, it seems that it loads the DXF file in inches regardless, and it is then necessary to change to Metric units at Options> Space Units menu item after opening the file. Although I said I would do no more on the chairing, I have in fact been doing so, and I now have an algorithm to set 1 or 2 bridge chairs as necessary at the heel of a switch: 2_160542_230000000.png ...