The shaft made from steel (shear modulusG =80 MPa). First and second parts - circle (d =36 mm), third- rectangular ( b = 36 mm, h =54 mm), fourth and fifth - annular (di = 30,0 mm, de =40 mm). Shaft is loaded with moments: Mf1 = -260Nm, M f2=-280 Nm, M f 3 =-268 Nm, M f 4 =260 Nm, Mf5=208 Nm, Mf6 =340 Nm. M 60,0 mm O M 82,0 OMB b=36,0 mm 96,0 M4 90,0 d=30,0 + MIS 60,0 M6