I'm looking at building a machine to cut fabric--small to start but eventually I'm looking for an envelope up to say 36x60". From my research so far, I think the first approach to try is to use a rotary cutter (similar to a pizza cutter) driven like a tangent knife.

What I need is software that can generate appropriate g-codes to rotate the cutter and also to calculate lead-in and lead-out cuts, starting from something like a DXF. Vinyl cutting seems to be the most closely related activity, so I figured this would be a good place to start asking questions.