... thườngOAБГД8,5 11 14 19 27 32 10 13 17 22 32 3868 10 ,5 13 ,5 19 23 ,5 2 ,1 2, 84,04,86,98,347 81 138 23 04766 92 13 20 17 00 22 4037506000 710 0400 - 25 00560 - 4000800 - 6300 18 00 - 10 600 315 0 - 15 0004500 - 18 0000,060 ,10 0 ,18 0,300, 62 0,90Đai thang hẹpYOYAYБYB8,5 11 14 19 10 13 17 22 80 10 13 18 2, 0 2, 83,54,85695 15 8 27 8 16 00 25 0035505600630 ... ( 425 ), 450, (475), 500, (600), 630, (670), 710 , (750), 800, (850), 900, (950), 10 00, (10 60), 11 20 , (11 80), 12 50, (13 20 ), 14 00, (15 00), 16 00, (17 00), 18 00, (19 00), 20 00, ( 21 2 0), 22 40, (23 60), 25 00 ... ≈ 20 ÷ 30 v: vận tốc đai; L: chi u dài dây đaiaddooo)(5 718 018 0 12 1 −−≈−=γαaddddaL4)( 2 )( 2 2 12 21 −+++=π−−+−++−= 2 12 2 21 2 1) (2 2)( 2 )(4 1 ddddLddLaππo 15 0 1 ≥αo 12 0 1 ≥α) (2 21 dda...