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Extension Spring Wound by Hand with Hooked Ends
An extension spring works in tension: its coils touch at rest and open as it is pulled, and a hook or eye at each end takes the load. Wind spring wire tightly round a rod with every turn touching the last, bend up a hook at each end, and relieve the winding stress with gentle heat.
The picture: our diagram of the close-wound body and its hooks.
Intermediate
An hour
Instructions
1
1
Wind the body
Wind the body
Clamp the end of the wire with the rod in the vise. Turn the rod by hand, guiding the wire so each turn lies tight against the last, until the body is long enough (step 5). Wear gloves and glasses: the wire springs.
Materials for this step:
Spring Steel Wire1 mTools needed:
Iron Rod
Bench Vise
Leather Work Gloves
Safety Glasses2
2
Cut and release
Cut and release
Hold the wire end, cut it leaving a tail for the hook, and let the coil unwind gently off the rod.
Tools needed:
Wire CuttersLeather Work GlovesSafety Glasses3
3
Form the hooks
Form the hooks
With the pliers, bend the last turn at each end up square to the body and close it into a hook or loop in line with the axis.
Tools needed:
Flat-Nose Pliers4
4
Relieve and check
Relieve and check
Warm the spring gently in the oven to relieve the winding stress, let it cool, and check that the coils close up again when it is released.
Tools needed:
Annealing Oven
Digital Caliper 6-Inch5
5
Wire needed
Wire needed
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Materials
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Tools Required
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