[CAMmando]

Most likely when importing solids into your "Alpha CAM" (which Im not familiar with) the resulting geometry is surfaces (maybe solids). For 2 1/2 axis milling, most toolpathing is accpmplished easiest by using drive curves not surfaces or solids. Extracting drive curves from solids or surfaces can at times be tedious until you are familaiar how to flavor the iges (or step or whatever) output and input of the systems involved. So for a part like you have shown, I would ask for the following using MasterCAM:

1) Step, ACIS, or Parasolids file.

OR

2) IGES With surfaces and wireframe either in separate or a single file.


DXF would be the last (worst choice).

This assumes your models are accurate and modeled at "Nominal".

It is possible that AlphaCam doesnt deal well with extracting drive curves from surfaces or solids. But I still cant imagine why someone would prefer DXF over Iges since DXF is strictly a 2D format. Unless they just dont trust your Models.