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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.
中级
An hour
说明
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.
此步骤所需材料：
弹簧钢丝1 m所需工具：
铁棒
台虎钳
皮革工作手套
安全眼镜2
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.
所需工具：
斜口钳皮革工作手套安全眼镜3
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.
所需工具：
平口钳4
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.
所需工具：
退火炉
6 英寸数显卡尺5
5
Wire needed
Wire needed
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