Inventor HSM provides a toolpath filleting function that is useful for avoiding sharp corners in 3D finishing toolpaths. With fillets applied, sharp turns in the toolpath can be reduced so that the CNC control can maintain a higher feedrate and/or prevent marks on the machined part.
The Fillets section and Fillet radius parameter are located on the Passes tab between the Stock to Leave and Smoothing sections
The following images show an example of a Parallel finishing toolpath using a 10 mm ball end mill.
Fillets disabled
Fillets enabled. Fillet radius is 10 mm - twice the tool radius
Fillets disabled, but the model has fillet geometry features applied
Enabling fillets on a Parallel finishing toolpath primarily affects corners perpendicular to passes.
Parallel toolpath without toolpath fillets
Parallel toolpath with a toolpath fillet radius of 4 mm
Similarly, for a Contour finishing operation, the fillets in vertical corners:
Contour toolpath without toolpath fillets
Contour toolpath with a toolpath fillet radius of 4 mm