UBUCIKO
UBUHLE NEMPILO
UBUCIKO BEZANDLA
AMASIKO NOMLANDO
EZOKUZIJABULISA
IMVELO
UKUDLA NEZIPHUZO
REVERSE ENGINEERING
IZAYENSI
EZEMIDLALO
UBUCHWEPHESHE
IZINTO EZIGQOKWAYO
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).
Ophakathi
2 hours
Imiyalelo
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.
Izinto zokwakha zalesi sinyathelo:
Isiyingi sefayibha esifakwe i-resin2 izicucu
Ibhushi yensimbi1 ucezu
Isiyingi sensimbi sangemuva1 ucezuAmathuluzi adingekayo:
Isando sokubethela ama-rivet
Isethi yama-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.
Izinto zokwakha zalesi sinyathelo:
Indandatho yokuthinta enendlebe yetheminali1 ucezu
Iseyilethi1 ucezuAmathuluzi adingekayo:
Isando sokubethela ama-rivetIsethi yama-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.
Izinto zokwakha zalesi sinyathelo:
Isici Sokumelana Nogesi Se-Carbon1 ucezu
Ibhawodi yetheminali2 izicucu
Indlebe yetheminali2 izicucuAmathuluzi adingekayo:
Amapleyisi anomlomo omude4
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.
Izinto zokwakha zalesi sinyathelo:
Isiqu sokulawula1 ucezu
Ingalo yokuthinta eshelelayo1 ucezu
Ishidi lokuvikela1 ucezu
Iphinikhi lerivethi1 ucezuAmathuluzi adingekayo:
Isando sokubethela ama-rivetIsethi yama-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.
Izinto zokwakha zalesi sinyathelo:
Iwasha lekliphu1 ucezu
Isivalo sensimbi esinezindlebe1 ucezuAmathuluzi adingekayo:
Amapleyisi anomlomo omude
Udlawu Lomlomo OyisicabaIzinto
14- 2 izicucuIsibambeli
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