A polyamide A-3 flat belt is used to transmit 15 hp under light shock conditions where K₂ = 1.25, and a factor of safety equal to or greater than 1.1 is appropriate. The pulley rotational axes are parallel and in the horizontal plane. The shafts are 9.5 ft apart. The 5-in driving pulley rotates at 1500 rev/min in such a way that the loose side is on top. The driven pulley is of 18-in diameter. Ask: a) what is the minimum initial tension F; that would put the drive at the point of slip (The actually friction coefficient due to the elastic creep is equal to the friction coefficient of the material)? Hint: Eq. 17-9 can be used if the actually friction coefficient is given; factor of safety is 1.1. A polyamide A-3 flat belt is used to transmit 15 hp under light shock conditions where K-1.25, and a factor of safety equal to or greater than 1.1 is appropriate. The pulley rotational axes are parallel and in the horizontal plane. The shafts are 9.5 ft apart. The 5-in driving pulley rotates at 1500 rev/min in such a way that the loose side is on top. The driven pulley is of 18-in diameter. Ask: b) with the tension F; from problem a), find the belt width b (in) with a factor of safety equal to 1.1. Hint: Assume b is an undetermined coefficient in expressions of (F), and w (weight per unit length in F.). Then use Eq. 17-7 to calculate b (friction coefficient fis known).