Hi,
I resent the steel supplier copies of the Fusion generated drawing files as PDFs and the confusion has been cleared. I am now confident his quote genuinely reflects the parts that I want.
I have incorrectly assumed that a dxf file would show a representation of a 3D object in the same way as a drawing. Clearly dxf files are very much more basic than I imagined.
I had occasion to send a file to a tool and die company to have some machining done on a part for me about a fortnight ago. I sent them a dxf of the Fusion generated drawing, but that showed the same 10:1 scaling. As they had the physical part it was very clear that there had been some sort of scaling snafu, they scaled the dxf file and were then able to generate the tool path. The company gave me a choice of file formats to send, including dxf. It would appear that dxf is NOT the same as a 3D model.
Thanks for everyones help. In this case it has been 'educating a newbie' out of his preconceptions.
Craig