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
Carbon Resistance Ring: Laminated Paper Gelled with 15% Tung Oil, Graphite-Shellac Track
Mallory's quiet volume-control ring (US 2,144,925, 1939). Hard bases were noisy and soft paper ones changed with damp. Their answer: paper rings soaked in 15 % raw tung oil and baked, so the oil gels inside the paper. It shuts out moisture but stays soft and springy, and the wiper runs on it quietly. A graphite paint makes the track, silver paint the ends.
The picture: the patent's drawing (Fig. 3).
Àárín
1 day
Ìlànà
1
1
Punch rings from three-ply paper
Punch rings from three-ply paper
The base is three papers stuck into one sheet: litho paper at the back, newsprint in the middle, manila on the face that takes the track. Punch rings from it. Ours: a punch press with a ring die.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Bébà aláwọ̀ mẹ́ta tí a lẹ̀ pọ̀1 ẹyọÀwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ ìtẹ̀ ìlu ihò
Dáì fún gígé òrùka
Ìbọ̀wọ́ rọ́bà2
2
Soak 1 hour in 15 % tung oil in naphtha
Soak 1 hour in 15 % tung oil in naphtha
Soak the rings for about one hour in about 15 % raw tung oil in naphtha. Use raw oil, not heat-bodied or treated oil, so it can still gel.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Òróró tung15 partsÀwọn irinṣẹ́ tí a nílò:
Naphtha
Ago Gílásì
Òǹwọ̀n ìdọ́gba
Ohun ìrúwé
Ìbòjú ìmí tí ó bo gbogbo ojúÌbọ̀wọ́ rọ́bà3
3
Air-dry, then bake at 210–250 °C
Air-dry, then bake at 210–250 °C
Dry the rings in air for two hours or more, then bake 15 to 30 minutes at 210 to 250 °C. The oil gels in the paper's pores; the paper stays pliable.
Àwọn irinṣẹ́ tí a nílò:
Ààrò ìgbẹ̀
Ìwọ̀n Ooru Ààrò
Ìbọ̀wọ́ Tí Ń Fara Da Ooru4
4
Spray the graphite track
Spray the graphite track
Spray on the resistance paint, for example graphite in a shellac binder. The patent gives no proportions. The track can be tapered in thickness, width or mix to shape the resistance curve.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ẹ̀kù Graphite1 as required
Sẹ́làkì1 as requiredÀwọn irinṣẹ́ tí a nílò:
Ìbọn Ìfúnpọn
Ẹ̀rọ ìfun afẹ́fẹ́Ìbòjú ìmí tí ó bo gbogbo ojúÌbọ̀wọ́ rọ́bà5
5
Paint silver ends, bake at 220 °C
Paint silver ends, bake at 220 °C
Spray or paint the two end terminals with silver particles in shellac. Dry, then bake at about 220 °C to cure and harden the track. The slight warp from soaking flattens out again.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Kùn fàdákà tí ń gba iná mànàmáná1 as requiredÀwọn irinṣẹ́ tí a nílò:
Ìbọn ÌfúnpọnÀàrò ìgbẹ̀Ìwọ̀n Ooru ÀàròÌbọ̀wọ́ Tí Ń Fara Da OoruÀwọn ohun-èlò
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- 15 partsÀyè
- 1 as requiredÀyè
- 1 as requiredÀyè
- 1 as requiredÀyè
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