With HSM tool paths you hear a a lot about radial chip thinning. When milling with light radial engagement (AKA width of cut or step-over), anything under 50%, you are not cutting a full thickness chip and the tool manufacturer's feed rate limits are based on that full thickness chip load. Applying chip thinning formulas you can increase the feed rate to catch up to what would be the average chip thickness. In essence, you are cutting a longer thinner chip that has the same mass as the shorter thicker chip while staying under the chip load limit of the tool.
The same applies for axial depth of cut, instead of at the 50% engagement, full chip thickness is at the radius of the corner, be it a bull nose or ball nose endmill or a toroid (round) insert face mill. If you cut an axial depth of cut less than the full radius, you need to increase the feed rate to compensate for the thinning of the chip. In the illustration above, you can see the lower depth changes the lead angle and the chip thickness (the blue area to the right of the red line).
We have a free embeddable calculators for both axial and radial chip thinning:
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