... L + L1 + L2 S n ( ph) =(1 5+2 ) /(1 250.0,34)=0.04(ph) T0 =(1 3+2 ) /(1 250.0,34)=0,04 T01= 0,0 4+0 ,04= 0,08 (ph) - Bc 2: khoan l chng tõm L =6 (mm); L1 = (mm).s=0,06 (mm/v) n=315 (v/p) 02 T = 2(6 +3 ) /(0 ,06.315)=0,95 ... + l1 + l n.s =(3 0+3 ) /(1 250.0,34)=0,07 (ph) Bc :tin tinh b mt 16 L=30 (mm) l1=3 (mm) l2=0 (mm) n=1500 (v/p) s=0,15(mm/v) T03 = L + l1 + l n.s =(3 0+3 ) /(1 500.0,15)= 0.146 (ph) =>Tnc3 = T01+T02+T03= ... L =33(mm); n=800(vũng/phỳt) - ữ L1 =L2= (1 3)bc ren =3(mm) - - T05 20 + + 1,5.800 = =0,04(phỳt ) =>T05= 0,0 8+0 ,04=0,12 =>Tnc2= T01+T02+T03+T04+T05= 0,2 8+0 ,63 4+0 ,7 7+1 ,7 4+0 ,12=3,544 (ph) +nguyờn...