{"id":3443,"date":"2024-07-06T07:42:33","date_gmt":"2024-07-06T07:42:33","guid":{"rendered":"https:\/\/www.betrisey.ch\/microfoucault-n-26-donnees-techniques"},"modified":"2025-01-28T08:16:16","modified_gmt":"2025-01-28T08:16:16","slug":"microfoucault-n-26-donnees-techniques","status":"publish","type":"page","link":"https:\/\/www.betrisey.ch\/en\/microfoucault-n-26-donnees-techniques","title":{"rendered":"MicroFoucault n\u00b0 26: Trial and error and technical data. (Part 1)"},"content":{"rendered":"\n

Diary of attempts to train a small wild animal…<\/p>\n\n\n\n

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6 May 2024, first attempt:<\/strong><\/p>\n\n\n

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The wire guide is a watch bearing ruby. The upper Charron ring is made of bronze (friction, 6 mm) and the lower of copper (eddy current, 15 mm inside). The balance wheel is a rolling ball weighing 261 grams. The whole thing has taken the place of the MiniFoucault<\/a> between my kitchen and living room, which disturbs it a lot but gives me the enormous advantage of having it permanently in front of me.<\/p>\n\n\n\n

It wobbles, but doesn’t turn despite all my attempts to adjust it. Failed.<\/p>\n\n\n\n

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Test #2:<\/strong><\/p>\n\n\n

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Modification n\u00b01, <\/strong>the upper Charron ring is now half the size, in bronze (friction, 3 mm)<\/p>\n\n\n\n

Modification n\u00b02<\/strong>, the lower Charron ring is made of aluminium (eddy current brake, 25 mm)<\/p>\n\n\n\n

Modification no. 3,<\/strong> the balance wheel. It is now a 700 gram petanque ball suspended by a magnet.<\/p>\n\n\n\n

Modification n\u00b04,<\/strong> addition of a pointer to avoid parasitic oscillations.<\/p>\n\n\n\n

Oscillates, spun anarchically one day, sometimes in the right direction but too quickly, then stopped. Semi-failure.<\/p>\n\n\n\n

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Test no. 3:<\/strong><\/p>\n\n\n

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Modification n\u00b01<\/strong>, the lower Charron ring. It is now made of aluminium (friction: a 2’5″ silicon hard disk 20 mm inside placed on another 3’5″ aluminium hard disk 25 mm inside).<\/p>\n\n\n\n

Oscillates, but does not rotate. An abject failure.<\/p>\n\n\n\n

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Test #4:<\/strong><\/p>\n\n\n\n

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Test n\u00b05<\/strong><\/p>\n\n\n\n

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Modification no. 11<\/strong>, Replacement balance wheel: cast lead, turned, drilled and copper-plated. (6 hours of electrolysis!!!) This balance wheel is now non-magnetic, three times heavier (2.171 kilos) and its centre of gravity is lower.<\/p>\n\n\n\n

Modification no. 12<\/strong>, the length, now 12 centimetres.<\/p>\n\n\n\n

State of the lead ingots before machining: various scraps melted in a ceramic bowl…<\/p>\n\n\n\n

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Worked (badly) for a few hours after a few days of adjustments, then stopped its revolution to oscillate for 12 hours on the same plane before breaking the wire.<\/p>\n\n\n\n

A complete failure, but it doesn’t matter because things are getting interesting.<\/p>\n\n\n\n

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Test no. 6<\/strong><\/p>\n\n\n\n