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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 Ls ≤ 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.
Problem 10-23
Clamping fixture.
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Shigley's Mechanical Engineering Design (McGraw-Hill Series in Mechanical Engineering)
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