IṢẸ́ ỌNÀ
ẸWÀ ÀTI ÌLERA
IṢẸ́ ỌWỌ́
ÀṢÀ ÀTI ÌTÀN
ÌṢERÉ
ÀYÍKÁ
OÚNJẸ ÀTI OHUN MÍMU
REVERSE ENGINEERING
SÁYẸ́ǸSÌ
ERÉ ÌDÁRAYÁ
ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀
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.
Àárín
1 day
Ìlànà
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.
Àwọn irinṣẹ́ tí a nílò:
Ìṣù Igi Líle
Ẹ̀rọ ìyí igi
Òṣùwọ̀n Kálípà Díjítà Ìnṣì 6
Ayùn Irin2
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Bọ́ọ̀lù oníyíká1 ẹyọÀwọn irinṣẹ́ tí a nílò:
Iyanrìn ìdàsílẹ̀
Àpótí àwòṣe iyanrìn
Ọkọ́ Ọwọ́3
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ìṣù Òjé11 kgÀwọn irinṣẹ́ tí a nílò:
Ìkòkò ìyọ́ ti irin ìdà
Ìléru alágbẹ̀dẹ
Ẹmú Ìkòkò Ìyọ́
Òṣùwọ̀n Díjítà Ilé Ìdáná
Ìbọ̀wọ́ wẹ́lídìn
Aṣọ Ìdílé Awọ
Ààbò Ojú Gbogbo4
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.
Àwọn irinṣẹ́ tí a nílò:
Ayùn Irin
Àkójọ ÌfáÒṣùwọ̀n Díjítà Ilé ÌdánáÌbọ̀wọ́ wẹ́lídìnÀwọn irinṣẹ́ tó nílò
15- Àyè
- Àyè
- Àyè
- Àyè
- Àyè
Ìtọ́nisọ́nà yìí ń ṣe
Blueprint tó jọra
Àwọn blueprint wọ̀nyí pín ìmọ̀ — ọ̀nà, ohun-èlò tàbí ìlànà
CC0 Àgbègbè Gbogbogbò
Blueprint yìí ti jáde lábẹ́ CC0. O lè ṣe àdàkọ, yí padà, pín, àti lò láìsí ìyọ̀ǹda.
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