*3-24. Old clocks were constructed using a fusee B to drive the gears and watch hands. The purpose of the fusee is to increase the leverage developed by the mainspring A as it uncoils and thereby loses some of its tension. The mainspring can develop a torque (moment) T, = k0, where k = 0.015 N m/rad is the torsional stiffness and 0 is the angle of twist of the spring in radians. If the torque T; developed by the fusee is to remain constant as the mainspring winds down, and x = 10 mm when 0 = 4 rad, determine the required radius of the fusee when 0 = 3 rad. 12 mm Тт,
*3-24. Old clocks were constructed using a fusee B to drive the gears and watch hands. The purpose of the fusee is to increase the leverage developed by the mainspring A as it uncoils and thereby loses some of its tension. The mainspring can develop a torque (moment) T, = k0, where k = 0.015 N m/rad is the torsional stiffness and 0 is the angle of twist of the spring in radians. If the torque T; developed by the fusee is to remain constant as the mainspring winds down, and x = 10 mm when 0 = 4 rad, determine the required radius of the fusee when 0 = 3 rad. 12 mm Тт,
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:*3-24. Old clocks were constructed using a fusee B to
drive the gears and watch hands. The purpose of the fusee is
to increase the leverage developed by the mainspring A as it
uncoils and thereby loses some of its tension. The mainspring
can develop a torque (moment) T, = k0, where
k = 0.015 N m/rad is the torsional stiffness and 0 is the
angle of twist of the spring in radians. If the torque T;
developed by the fusee is to remain constant as the
mainspring winds down, and x = 10 mm when 0 = 4 rad,
determine the required radius of the fusee when 0 = 3 rad.
12 mm
Тт,
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