Solve Problem 10-28 by iterating with an initial value of C = 8. If you have already solved Problem 10-28, compare the steps and the results. 

Data in Problem 10-28

A holding fixture for a workpiece 37.5 mm thick at the clamp locations is being designed. The detail of one of the clamps is shown in the figure. A spring is required to drive the clamp upward when removing the workpiece with a starting force of 45 N. The clamp screw has an M10 × 1.25 thread. Allow a diametral clearance of 1.25 mm between it and the uncompressed spring. It is further specified that the free length of the spring should be L0 ≤ 48 mm, the solid height L ≤ 31.5 mm, and the safety factor when closed solid should be ns ≥ 1.2. Starting with d = 2 mm, design a suitable helical coil compression spring for this fixture. For A227 HD steel, wire diameters are available in 0.2-mm increments between 0.2 to 3.2 mm.

Spherical washer- Slot Workpiece Clamp screw -Clamp Groove Pin