The presented paper investigates the latest achievements of calculation algorithm and derivation for friction forces of intelligent micropairs, friction micro-joints and especially for friction forces of the conical, spherical, cylindrical, parabolic, hyperbolical micro-bearings particularly in HDD micro-bearings. Various bearing surfaces and oil dynamic viscosity changes in gap height directions are assumed. Author formulates one Theorem and some Corollaries where the calculation algorithm for friction forces determination was defined.