Answer Happy

Q2. (50p) An as-wound helical compression spring, made of steel wire (A227, Washburn & Moen), will be used to support 190 lb boxes (see Figure given below). It is needed that when box is placed on the tabletop, spring should deflect 2.5 in from its free length (Lo). Spring will be used in a 4 in diameter hole. Clearance between inner wall of the hole and outer edge of the spring is 0.23/2 = 0.115 in. Design criteria: • Ends are squared and closed. 10 SC s 11 (spring index) • 72 0.15 (linearity) a) (15p) Select the wire from available diameters (Table A-28) 0.115 in Determine, b) (10p) Coil diameter c) (5p) Spring rate d) (10p) Total number of turns e) (10p) Free and solid length 190 lb Lop 25 in 02 dhole = 4 in Lop >