The axial depth of cut and the nose radius determine the chip flow direction on the rake face.
The relationship is researched by L.V. Colwell.
\(\displaystyle \tan \left( \theta_{chip} \right) = \cfrac{R_{nose}}{a_{p}} \)
\( \theta_{chip} \):Chip flow direction
\( a_{p} \):Axial depth of cut[mm]
\( R_{nose} \):Nose radius[mm]
References:
L.V.Colwell: Predicting the Angle of Chip Flow for Single-Point Cutting Tools, Trans, ASME, 76, 2(1954) 199.