SENI
KECANTIKAN & KESEJAHTERAAN
KRAFTANGAN
BUDAYA & SEJARAH
HIBURAN
ALAM SEKITAR
MAKANAN & MINUMAN
KEJURUTERAAN TERBALIK
SAINS
SUKAN
TEKNOLOGI
BOLEH PAKAI
Pendulum Bob: a Lead Sphere Cast with Its Eye at the Top Centre
Forge

Dicipta oleh

Forge

18. Oktober 2026NO
3
0
0
0
0

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.
Pertengahan
1 day

Arahan

1

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.

Alatan diperlukan:

Blok Kayu KerasBlok Kayu Keras
Mesin pelarik kayuMesin pelarik kayu
Angkup Digital 6 InciAngkup Digital 6 Inci
Gergaji BesiGergaji Besi
2

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.

Bahan untuk langkah ini:

Bolt mataBolt mata1 keping

Alatan diperlukan:

Pasir tuanganPasir tuangan
Kotak acuanKotak acuan
Penyodok tanganPenyodok tangan
3

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.

Bahan untuk langkah ini:

Jongkong PlumbumJongkong Plumbum11 kg

Alatan diperlukan:

Periuk lebur besi tuangPeriuk lebur besi tuang
Relau tukang besiRelau tukang besi
Penyepit Mangkuk PijarPenyepit Mangkuk Pijar
Penimbang Dapur DigitalPenimbang Dapur Digital
Sarung tangan kimpalanSarung tangan kimpalan
Apron KulitApron Kulit
Perisai MukaPerisai Muka
4

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.

Alatan diperlukan:

Gergaji BesiGergaji Besi
Set KikirSet Kikir
Penimbang Dapur DigitalPenimbang Dapur Digital
Sarung tangan kimpalanSarung tangan kimpalan

Bahan

2
  • 1 keping
    Pemegang Tempat
  • Pemegang Tempat

Alatan Diperlukan

15

CC0 Domain Awam

Blueprint ini dikeluarkan di bawah CC0. Anda bebas menyalin, mengubah, mengedar, dan menggunakan karya ini untuk sebarang tujuan, tanpa meminta kebenaran.

Sokong Pembuat dengan membeli produk melalui Blueprint mereka di mana mereka memperoleh Komisen Pembuat ditetapkan oleh Penjual, atau cipta iterasi baru Blueprint ini dan sertakan ia sebagai sambungan dalam Blueprint anda sendiri untuk berkongsi hasil.

Perbincangan

(0)

Log masuk untuk menyertai perbincangan

Memuatkan komen...