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Pendulum Bob: a Lead Sphere Cast with Its Eye at the Top Centre
A long pendulum needs a heavy, symmetrical bob: Foucault's of 1851 was a 28 kg brass-coated lead bob on a 67 m wire. This one is a solid lead sphere 12 cm across, about 10 kg, cast in sand with an eye bolt set in its exact top centre so the wire hangs through its axis. Size and method are ours.
The picture: our drawing.
中级
1 day
说明
1
1
Turn the pattern
Turn the pattern
Turn a hardwood ball 12 cm across on the lathe, checking it with the caliper in several directions, and saw it in half through its centre for a split pattern.
所需工具：
硬木块
木工车床
6 英寸数显卡尺
钢锯2
2
Ram the mould
Ram the mould
Ram one half in each part of the flask, draw them, and cut a sprue into the cavity to one side of the top. Set the eye bolt upside down in the sand of the top so its threaded shank hangs into the cavity exactly on the sphere's axis.
此步骤所需材料：
吊环螺栓1 个所需工具：
铸造砂
铸造砂箱
手铲3
3
Melt and pour
Melt and pour
Melt about 11 kg of lead in an iron pot on the forge. Skim it and pour into the sprue in one go until the sprue stands full. Let it cool in the sand.
此步骤所需材料：
铅锭11 公斤所需工具：
铸铁熔锅
铁匠炉
坩埚钳
数字厨房秤
电焊手套
皮革围裙
面屏4
4
Trim and check
Trim and check
Shake it out, saw off the sprue and file the seam. Hang it by the eye: it must hang still with the eye straight above the centre. Weigh it.
所需工具：
钢锯
锉刀套装数字厨房秤电焊手套此蓝图制作
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