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KECANTIKAN & KESEJAHTERAAN
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TEKNOLOGI
BOLEH PAKAI
Potentiometer: Mallory Volume Control on a Tung-Oil Paper Ring
A 1930s radio volume control from Mallory's patent (US 2,144,925, 1939). A carbon ring sits on a base of two resin-fibre discs. A spring arm on the shaft wipes the ring with one contact and a centre metal ring with its fingers, so turning the knob changes the resistance between the centre lug and either end lug. The patent gives no sizes; the parts are named by what they do.
The picture: the patent's drawing (Figs. 1 and 2).
Pertengahan
2 hours
Arahan
1
1
Clamp the two base discs on the bushing
Clamp the two base discs on the bushing
Stack two discs of resin-impregnated fibre. A metal bushing through their centres clamps them together, with a metal disc clamped against the back of the rear disc. Ours: close the bushing with a hammer and rivet set.
Bahan untuk langkah ini:
Cakera Gentian Diresapi Resin2 keping
Bush Logam1 keping
Cakera Sokongan Logam1 kepingAlatan diperlukan:
Tukul rivet
Set rivet2
2
Fit the centre contact ring
Fit the centre contact ring
Lay the metal contact ring, with its own terminal lug, on the face of the front disc, centred. An eyelet (or rivet) through the lug holds it. Ours: set with a rivet set and hammer.
Bahan untuk langkah ini:
Cincin Sesentuh dengan Lug Terminal1 keping
Eyelet1 kepingAlatan diperlukan:
Tukul rivetSet rivet3
3
Bolt on the resistance ring
Bolt on the resistance ring
Lay the carbon resistance ring on the front disc, round the contact ring. Two terminal bolts pass through the ring's silver-painted ends and the disc; each holds a terminal lug under the disc. The bolts clamp the ring and connect its ends.
Bahan untuk langkah ini:
Elemen Rintangan Karbon1 keping
Bolt Terminal2 keping
Lug Terminal2 kepingAlatan diperlukan:
Playar muncung tirus4
4
Fit shaft and spring contact arm
Fit shaft and spring contact arm
Put the shaft through the bushing. On its front end fix the spring contact arm over a small piece of sheet insulation: upset the shaft end to hold the insulation, and clamp arm and insulation together with a rivet pin. The arm's contactor rides on the carbon track, its fingers on the contact ring.
Bahan untuk langkah ini:
Aci Kawalan1 keping
Lengan Sesentuh Pegas1 keping
Kepingan Penebat1 keping
Pin Rivet1 kepingAlatan diperlukan:
Tukul rivetSet rivet5
5
Clip washer and cover
Clip washer and cover
Snap a clip washer into the groove in the shaft behind the bushing. It stops the shaft sliding and keeps the arm and fingers pressed on their rings. Fix the metal cover cap over the parts by bending its ears onto the discs.
Bahan untuk langkah ini:
Pencuci Klip1 keping
Penutup logam bertelinga1 kepingAlatan diperlukan:
Playar muncung tirus
Playar Muncung RataBahan
14- 2 kepingPemegang Tempat
- 1 kepingPemegang Tempat
- 1 kepingPemegang Tempat
- Pemegang Tempat
- 1 kepingPemegang Tempat
- 1 kepingPemegang Tempat
- 2 kepingPemegang Tempat
- 2 kepingPemegang Tempat
- 1 kepingPemegang Tempat
- 1 kepingPemegang Tempat
- 1 kepingPemegang Tempat
- 1 kepingPemegang Tempat
- 1 kepingPemegang Tempat
- 1 kepingPemegang Tempat
Blueprint ini membuat
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