Datoteka:Watch_jewel_bearing_and_capstone.svg
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![Datoteka:Watch jewel bearing and capstone.svg](http://upload.wikimedia.org/wikipedia/commons/thumb/b/bf/Watch_jewel_bearing_and_capstone.svg/640px-Watch_jewel_bearing_and_capstone.svg.png)
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Sažetak
OpisWatch jewel bearing and capstone.svg |
English: Drawing of a jewel bearing and capstone in a mechanical watch. The bearing is sectioned through the axis. The jewels (red) are made of synthetic ruby. The lower jewel is called the 'hole jewel', the upper one is the 'capstone' or 'end jewel'. This type of bearing is used in watches where friction is critical, such as in the balance wheel pivots. With ordinary bearings (shown in Watch jewel bearing.svg), when the watch is vertical the shoulder of the shaft bears against the face of the hole jewel, increasing friction. This causes the watch's rate to vary with its position. In contrast, in this type, the capstone provides a low friction surface for the rounded end of the pivot to press against instead, reducing friction. The hole for the pivot is slightly convex (hourglass shaped) so that if the pivot is not exactly vertical it won't jam in the hole. The surface of the lower jewel ('bombé') is also slightly convex, holding a drop of oil (yellow) between the jewels, in contact with the pivot, by capillary attraction. The jewels are press-fitted into holes in the movement's supporting plates (grey). Information for this drawing came from Henry B. Fried (1954) Bench Practices for Watch and Clockmaker, Arlington Book Co., Virginia, USA, Book 3, Ch. 1, p.140-188 |
Datum | |
Izvor | Vlastito djelo postavljača |
Autor | Chris Burks Chetvorno |
Dopuštenje (Naknadna uporaba ove datoteke) |
I the author release this drawing into the public domain for any use whatever. |
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Licencija
Public domainPublic domainfalsefalse |
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Ja, nositelj autorskog prava za ovo djelo, prepuštam ovo djelo u javno vlasništvo. Ovo prepuštanje vrijedi za cijeli svijet. U nekim državama to nije pravno moguće; ako je tako: Dajem svima prava da koriste ovo djelo za bilo koju svrhu, bez ikakvih uvjeta, osim ako takvi uvjeti nisu propisani zakonom. |
Opisi
Dodajte kratko objašnjenje što predstavlja ova datoteka
Jewel balance wheel bearing and capstone
Predmeti prikazani u ovoj datoteci
motiv
13. srpnja 2008
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Datum/Vrijeme | Minijatura | Dimenzije | Suradnik | Komentar | |
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sadašnja | 17:59, 14. srpnja 2008. | ![]() | 640 × 420 (28 KB) | Chetvorno | == Summary == {{Information |Description={{en|Drawing of a jewel bearing and capstone in a mechanical watch. The bearing is sectioned through the axis. The jewels (red) are made of synthetic ruby. The lower jewel is calle |
08:47, 14. srpnja 2008. | ![]() | 640 × 420 (28 KB) | Chetvorno | {{Information |Description={{en|Drawing of a jewel bearing and capstone for a balance wheel pivot in a Wikipedia:mechanical watch. The bearing is sectioned through the axis. |Source=Own work by uploader |Date=2008-07-13 |Author=Chris Burks [[User |
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