An ɗauki dubban shekaru ana ƙirƙira ƙananan screws har sai da aka danne su a gefen agogo kuma aka sassauta su a gaba da agogo. Shin foda na gwal sun yi tunani game da matsala, me yasa dole a ƙarfafa su ta hanyar agogo?
Mafi sauƙaƙan kayan aikin inji guda shida sune:Sukurori, Filayen Maɗaukaki, Levers, Pulleys, Wedges, Wheel, Axles.
Screw ɗin yana cikin injuna guda shida masu sauƙi, amma idan an faɗi a sarari, axis ne kawai da wani jirgin sama mai karkata zuwa kewaye da shi. A yau, sukurori sun haɓaka daidaitattun masu girma dabam. Hanyar da ta dace ta yin amfani da dunƙule ita ce ƙarfafa shi a kusa da agogon hannu (saɓanin juzu'in da ke kusa da agogo don sassauta).
Duk da haka, tun da screws a farkon ƙirƙira duk an yi su da hannu, ingancin screws ba daidai ba ne, wanda sau da yawa ana ƙaddara ta hanyar zaɓi na mai sana'a.
A tsakiyar karni na 16, injiniyan kotu na Faransa Jaques Besson ya kirkiro wani lathe da za a iya yanke shi zuwa dunƙule, kuma wannan fasaha ta shahara cikin shekaru 100. Bature Henry Maudsley ya ƙirƙira lathe na zamani a cikin 1797, kuma tare da shi, an inganta ingantaccen zaren. Duk da haka, babu daidaitattun ma'auni don girman da fineness na sukurori.
Wannan yanayin ya canza a cikin 1841. Joseph Whitworth, wani koyan Maudsley, ya gabatar da wata kasida ga Cibiyar Injiniyoyi na Municipal yana kira ga haɗakar samfuran dunƙule. Ya ba da shawarwari guda biyu:
1. Matsakaicin zaren dunƙule ya kamata ya zama 55 °.
2. Ba tare da la'akari da diamita na dunƙule ba, ya kamata a ɗauki takamaiman ma'auni don adadin wayoyi a kowace ƙafa.
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Lokacin aikawa: Afrilu-16-2020