Oleh : Angga Panji Satria Pratama 0906555973 Gema Perwira Putra 0906556036 Buditama Nugraha Mirza 0906556010

Belt

Belt

Dik : P = 190 W N = 350 rpm d1= 40 mm = 0.040 m d2= 160 mm = 0.160 m ns (very good,very good, good, not Perbandingan rasio 1 : 4 ( V-Belt ) serius, not serius) = ns,x*ns,y= 1.2*1.0 Synchronous Belt : = 1.2 w = 25 mm t = 1 0mm L = 800 mm = 0.8 m x = 430 mm = 0.43 m Material=rubber, so =1140 kg/m3 (Table 18.1 MD Khurmi) Dit : Jb : = 2N/60 = 2*3.14*350/60 =36.63 rad/s v = d2/2 1 = 180 2 = 36.63*0.160/2 = 180 16 =164 = 2.93 m/s = 175.84 m/menit Sin = d2-d1/2x = 164 /180 = 2.86 rad = 0.160-0.040/2*0.43 = 0.3 = 0.1395

= 8.02

2.3 log T1/T2 log T1/T2 T1/T2 T2 P = (T1 T2)v 190 = (0.947 T1)2.93 T1 = 68.398 N T2 =3.629 N m = A = 25*10*10-6*1140 = 0.285 kg/m Tc = mv2 = 0.285 *2.932 = 2.447 N

= 2 cosec 17 = 1.276 = 18.876 = 0.053T1

0 = T/a = 70.845/2.5 = 28.338 Mpa strength = 0 ns = 28.338 *1.2 = 34 Mpa NYLON (45 MPa)

T = T1 + Tc = 68.398 + 2.447 = 70.845 N

Puli

Material PuliMaximum bending momentpuli yang dipakai mempunyai 4 lengan sehingga, n : 4

M = 2 T/n

T : torsi yang dihasilkan puli

M = 2 (T1 T2) R / n = 2,59 N m Z = (w)3 / 8

= 6.136 x 10-6s

0 = M / Z = 0.42 MPa

= 0 * ns

= 0.5 MPa

Shaft

W pisau = 4.9 N W shaft = 24.52 N W total pada puli= 99 N d = 20 mm = 0.02 m ns (very good,very good, good, not serius, not serius) = ns,x*ns,y = 1.2*1.0 = 1.2 N = 350 rpm P = 190 Watt

Fx =0 fy =0 Ra + Rb = 128.419N M = 0 -4.9(295) 24.525(147.5) + Rb(170)+ Ra (45) = 0 Ra = 131.47N Rb= -5. 023 N (negatif karena berbalik arah dengan Ra) Mmax = 6269,04 Nmm = 6.27 Nm T = 60P/2N = 60*190/2*3.14*350 =5.18 Nm Te = (T2 + M2)0.5 = (5.182 + 6.27 2)0.5 = 8.13 Nm

all = 16Te/d3 = 16*8.13/(3.14*0.023 ) = 5.18 Mpa = all ns = 5.179*1.2 = 6.21 Mpa Me = 0.5 {M + (T2 + M2)0.5} = 7.2 Nm all = 32Me/d3 = 32*9.11/3.14*0.023 = 9.168 Mpa = all ns = 9.168*1.2 = 11 Mpa Aluminium ( = 17 MPa)

NUT

Dik

: M19 dari tabel diperoleh : pitch = 2.5 mm major/nominal = d = 20 mm minor/core = dp = 18.376 mm effective = dc = 17.294 mm

Dit : Jb : upward force acting on the cylinder cover P = d2 p/4 Resisting force offered by n number of bolts or studs P = dc 2 n Jadi, d2 p/4 = dc2 n/4 3.14*400*5/4 = 3.14*299.082436* *4/4 1570 = 939.12 all= 1.67 MPa = all ns = 1.67*2.3 = 3.841 Mpa Aluminium ( = 17 MPa) Stainless steels ( = 207 MPa)

Bearing

Bearing Dik : Bore = 20 mm, outside diameter = 47mm, width = 14 mm

jadi bearing number = 204. Dari tabel 22.8 (khurmi) didapat (self aligning bearing) C0=390kg C=980kg . K=3 (ball bearing) Ks = 1,0 (uniform dan steady load) V = 1 jawab Wr = T shaft/r shaft = 518 N Wa = T shaft/r pisau = 74 N We= (Xr.V.Wr+Ya.Wa)ks = (1 x 1 x 518 + 1.3 X 74) x 1 = 614.2 N = 62.60kg L = (C/We)k x 106 Rev = (980/62.60)3 x 106 = 15.65 x 106 Revolution

Self aligning bearing Pergeseran kelurusan shaft dapat diatasi Bearing mudah dilepas dan dipasang Cukup dingin pada kecepatan tinggi Cocok untuk shaft dengan axial load yang kecil