SENI
KECANTIKAN & KESEJAHTERAAN
KRAFTANGAN
BUDAYA & SEJARAH
HIBURAN
ALAM SEKITAR
MAKANAN & MINUMAN
KEJURUTERAAN TERBALIK
SAINS
SUKAN
TEKNOLOGI
BOLEH PAKAI
The Flexible Shaft: Turning a Tool Round a Corner
A dentist's drill must reach any tooth at any angle while it spins. A rigid shaft cannot follow the hand; universal joints give a few fixed bends. James B. Morrison of St. Louis tried two answers. His dental engine of 1871 carried the drive by a belt over pivoted, sprung arms. A year earlier his US 106,498, *Improvement in Flexible Shafts*, dated 16 August 1870, carried it through "a wire spiral or helix … enveloped in a short piece of india-rubber pipe, which allows the free flexure of the helix", in sleeves that act as bearings, with an adjustable head holding the bur and a parallel bracket for the instrument tray.
The flexible shaft outlived the dental use: it drives rotary tools, speedometers and hedge trimmers today. This rung works out why only thin wires can bend and keep turning, and makes a flexible shaft from wound spring wire.
Pemula
About 3 hours
Arahan
1
1
Bending stress, fatigue and torque
Bending stress, fatigue and torque
Memuatkan buku nota Jupyter…
2
2
The sibling: belt over sprung arms
The sibling: belt over sprung arms
Morrison's other answer to the same problem carries the drive by a belt over pivoted arms. The embedded blueprint builds it; compare the two ways of reaching round a corner.
3
3
Read the 1870 flexible power-conveyer
Read the 1870 flexible power-conveyer
Fig. 1 of US 106,498 shows the apparatus on a stand: a pulley shaft B, joined by a wire helix C in a rubber pipe c to a shaft section D, turning in a swivel-eye E; a double hinged parallel bracket H, I carrying the instrument tray L, which stays level however the bracket swings; and further helix sections R and t′ leading through a sleeve to the socket-head holding the burr U.
The patent's three claims, in order: the flexible shaft with its enveloping sleeve, which gives journal-bearing to the enclosed shaft and the tool; an adjustable head joined to the sleeve by a hinge, so the tool can be set at any angle; and the combination with a parallel bracket that swings, rises and extends.
4
4
Wind a flexible shaft and drive it
Wind a flexible shaft and drive it
Clamp a 3 mm steel rod in a cordless drill as a mandrel. Clamp one end of a length of 0.8 mm spring steel wire to the rod and, turning the drill slowly, wind a close helix about 400 mm long, every turn touching the last. Slide it off: that is the core.
Push a short length of steel rod into each end and secure it with a dab of solder or a crimped sleeve. Chuck one end in the drill; put a small drill bit in a pin chuck on the other end, held in a length of aluminium tube as the sleeve-bearing.
Bend the core round a 100 mm radius and run the drill in the direction that tightens the coil: the bit turns and will drill soft wood. Reverse the drill: the coil opens, winds up and barely turns the bit. Compare with a commercial rotary-tool flex shaft.
Bahan untuk langkah ini:
Dawai keluli spring1 keping
Bar keluli mentah1 keping
Tiub aluminium1 keping
Pateri timah-plumbum1 keping
Aci lentur alat berputar1 kepingAlatan diperlukan:
Gerudi Tanpa Wayar
Set Mata Gerudi
Ragum Bangku
Alat pematerian
Sarung Tangan Kerja Kulit
Cermin Mata Keselamatan Jernih5
5
A flexible shaft that fails
A flexible shaft that fails
Flexible shaft faults.
Flow
Loading...
6
6
History and honest limits
History and honest limits
**James B. Morrison** of St. Louis was granted **US 106,498**, dated 16 August 1870, for his flexible power-conveyer "for dental and other purposes"; his treadle dental engine with sprung arms followed in 1871 (US 111,667). Flexible shafts with multi-layer wire cores now drive rotary tools, instrument cables and garden tools.
**Honest limits.** The bending-stress figures are the simple beam formula for one wire; a real core's stresses depend on its winding. A hand-wound single helix is a demonstration, not a tool shaft — it will not last.
Bahan
5- 1 kepingPemegang Tempat
- 1 kepingPemegang Tempat
- 1 kepingPemegang Tempat
- 1 kepingPemegang Tempat
- 1 kepingPemegang Tempat
Alatan Diperlukan
6- 1 vendor sell this, none ship to you yetPemegang Tempat
- Pemegang Tempat
- Pemegang Tempat
- Alat pematerian10% komisenMagento Legacy Storeships internationallyPemegang Tempat
- Pemegang Tempat
- Pemegang Tempat
Blueprint berkaitan
Blueprint ini berkongsi pengetahuan — teknik, bahan atau prinsip
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.