File:Watch jewel bearing and capstone.svg
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[edit]DescriptionWatch 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 |
Date | |
Source | Own work |
Author | Chris Burks Chetvorno |
Permission (Reusing this file) |
I the author release this drawing into the public domain for any use whatever. |
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[edit]Public domainPublic domainfalsefalse |
I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 15:59, 14 July 2008 | 640 × 420 (28 KB) | Chetvorno (talk | contribs) | == 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 | |
06:47, 14 July 2008 | 640 × 420 (28 KB) | Chetvorno (talk | contribs) | {{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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