Hello Stephane, In my app cutting force is calculated from material power constants. Which are measured in horse power per cubic inch of removed material. Then torque is calculted knowing RPM. Using torque and diameter i calculate cutting force. Which means cutting force is a product of all forces combined. This value is pretty accurate because it is measured experimentally. Now using lead angle, helix angle, rake angle etc you can find axial, and radial components. Its is easy to do, but i just do not see many people could need so much detail.

This link says "When using an endmill with a high helix (above 50°) the material engages that helix and creates an axial force that tries to pull the tool out of the holder. The higher the helix angle the more axial force is created, and the possibility of pullout is increased." The implication is that there is no axial component unless more than one flute is engaged in the cut. Is that correct?

This is not what the link says though. The axial vs lateral force only depends on the helix angle of the end mill.