If I understand your question correctly.
Programmed feed per tooth depends on the type of material and the tool.
Reduced radial engagement (below 50%) makes effective chip thickness less than the programmed value, so the programmed value must be increased.
I have never seen anyone using feed per tooth(fz) as a % of radial depth of cut(ae). Can you share the reference where you have found that information?
Feed per tooth (fz) is how much a tooth takes for one complete rotation.
Radial depth of cut (ae) is how much the tool is engaged in material. Most people prefer to use it as percentage of tool diameter (ae = d*0.5, ae = d*0.2, etc.)
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