Lab-26 AppB Belt Friction Engineering 36 Lab-26 AppB Belt Friction Bruce Mayer, PE Licensed Electrical & Mechanical Engineer BMayer@ChabotCollege.edu

Sticky Collar Collar B of weight W can slide along bearing Rod ks = 1.5 kN/m µs = 40% Collar B of weight W can slide along bearing Rod Spring UNstretched for θ = 0° Find Range of Values for W for equilibrium when θ = 20° and θ = 30°

Rotating Roller Bucket A connected to Block C by cable that passes over Roller B Drum B rotates CounterClockwise slowly at a constant rate The Coefficients of Friction at All Surfaces µs = 35% µk = 25% Find smallest Bucket Wt, W, for which Block C will a) Remain at REST b) be ABOUT to move UP the InCline c) Continue to move UP the Ramp at a CONSTANT speed

Sticky Collar 85kg µs = 40% Given Geometry and 85kg Motor; the mount has negligible weight The motor Wt on the Pivoted mount maintains the tension in the Flat Drive Belt µs for the Belt and Drums A & B is 0.40 Find Largest Torque, T, which can be transmitted to Drum B when Drum A rotates Clockwise