Thread testing Thread efficiencies for different pairs of materials and thread pitches Features - determine the thread efficiency with different thread-material pairings Learning objectives/experiments - determine the friction coefficient of a steel threaded spindle in conjunction with -- a cast iron nut -- a bronze nut -- a plastic nut - determine the relevant thread efficiency Specification [1] investigation of the thread efficiency with different thread-material pairings [2] nuts made of cast iron, bronze and plastic [3] spindles with trapezoidal thread, varying pitch [4] generate torque using pulley with spring balance and cable [5] load via graduated loads Technical data Spindle thread - TR30x6 and TR30x12P6 Rotary plate - diameter: 140mm Spring balance - 0...5N - graduation: 0,05N Weight - 1x 10N - 1x 20N LxWxH: 300x300x300mm Weight: approx. 15kg