My sizes are out

[Doddy]

I'm adding noise now to this thread which I don't want to do but I understand (I think) where Jazz is coming from - it's unlikely to be a tool offset or deliberate behaviour by the controller simply because the controller doesn't understand the geometry of the shape being cut - that's part of the CAM to apply the tool diameter offset performed by Fusion depending on the face being machined.

The only thing I can see in the manual are the backlash parameters 437..445 (DS DDCSV V3.1) that would likely have such an impact on behaviour, but even that I'm doubting as it is likely to introduce more steps, rather than reduce.