Question

10-20 A holding fixture for a workpiece 1½ in thick at 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 while removing or inserting a workpiece. A clamping force of 10 lbf is satisfactory. The base plate is ??? in thick. The clamp screw has a ???? in-20 UNF thread. It is useful to have the free length $L_0$ short enough so that the clamp screw can compress the spring upon fixture reassem- bly during inspection and service, say $L_0 \leq 1.5 + \frac{3}{8}$ in. The spring cannot close solid at a length greater than 1¼ in. The safety factor when compressed solid should be $n_s \geq$ 1.2, and at service load $n_1 \geq$ 1.5. Design a suitable helical coil compression spring for this fixture. Spherical washer Slot Problem 10-20 Clamping fixture. Workpiece Clamp screw Clamp Groove Pin

          10-20
A holding fixture for a workpiece 1½ in thick at 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
while removing or inserting a workpiece. A clamping force of 10 lbf is satisfactory. The base
plate is ??? in thick. The clamp screw has a ???? in-20 UNF thread. It is useful to have the free
length $L_0$ short enough so that the clamp screw can compress the spring upon fixture reassem-
bly during inspection and service, say $L_0 \leq 1.5 + \frac{3}{8}$ in. The spring cannot close solid at a length
greater than 1¼ in. The safety factor when compressed solid should be $n_s \geq$ 1.2, and at service
load $n_1 \geq$ 1.5. Design a suitable helical coil compression spring for this fixture.
Spherical washer
Slot
Problem 10-20
Clamping fixture.
Workpiece
Clamp screw
Clamp
Groove
Pin

10-20
A holding fixture for a workpiece 1½ in thick at 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
while removing or inserting a workpiece. A clamping force of 10 lbf is satisfactory. The base
plate is ??? in thick. The clamp screw has a ???? in-20 UNF thread. It is useful to have the free
length L0 short enough so that the clamp screw can compress the spring upon fixture reassem-
bly during inspection and service, say L0 ≤ 1.5 + (3)/(8) in. The spring cannot close solid at a length
greater than 1¼ in. The safety factor when compressed solid should be ns ≥ 1.2, and at service
load n1 ≥ 1.5. Design a suitable helical coil compression spring for this fixture.
Spherical washer
Slot
Problem 10-20
Clamping fixture.
Workpiece
Clamp screw
Clamp
Groove
Pin

Added by -Ngel H.

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