BAB IV PERHITUNGAN 4.1 Perh itun gan dan Desai n Pulley 1. Material Pulley Ditentukan : Cast Iron ρ = 7200kg/m 2 (Mudah diuat! murah" 2. Diameter Pulley Diameter #ulley ke$il d 1 = 100mm (ditentukan" Diameter #ulley esar d 2 = 2%0mm (dari #erhitungan velocity ratio diatas" &. 'e al im = )mm (ditentukan" *. +umlah spoke (n" Pulley ke$il n = * (ditentukan" Pulley esar n = , (ditentukan" ). Centri-ugal tress ( σ t ¿ σ t = ρ v 2 σ t =7200 kg m 3 ∗8,37 m s = 60,26 kN ,. ear Pulley (" B =1,25∗b B =1,25∗50 mm B =62,5 mm →63 mmans 7. Perhitungan dimensi #ada #ulley ke$il 'orsi T = Px 60 2 π n 1 = 551,6∗60 2 π ∗1600 =3290 N . mm = &!2 .m ending moment akiat elt (M" M = ( T 1 + T 2 +2 T c ) L →( L = jarak pulley dari bearing mtr ) M =( 49,8 + 115,7+2∗26,6 ) ∗0,15 m M =32,8 N Momen Puntir 34ui5alen ' e ¿ √ T 2 + M 2 =√ 3,29 2 + 32,8 2 =32,96 N . m Diameter sha-t minimum #ulley (d 1 " d 1 3 = T e 9,82 =¿ 1*!mm = 1)mm ans
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