Answer
Ana murɗa zobba na ciki don shigarwa a cikin rami, yayin da zoben waje ke faɗaɗa don shigarwa a kan shaft. Wannan bambance-bambancen yana ba da bayanin lissafin kayan aiki. Don zoben ciki, kayan aikin dole ne ya kasance yana da tsarin 'contraction' (kamar mazurari na mazugi) wanda ke rage diamita na zoben. Don zoben waje, ana amfani da kayan aikin 'mai watsawa' ko madaidaicin madauri don ƙara diamita. Ƙirar waɗannan kayan aikin dole ne su tabbatar da cewa 'Mafi girman Deflection' $f_{max} = D_{kyauta} - D_{ shigar}$ bai wuce iyakar kayan abu ba. Bugu da ƙari, farfajiyar tuntuɓar kayan aikin dole ne ya zama santsi don guje wa ɓata gefuna na zobe, waɗanda su ne wuraren da suka fi rauni don ƙaddamarwa. Don zoben juyi da yawa, kayan aikin dole ne kuma su hana juyowa daga 'fitowa' ko yin marhabin yayin lokacin haɓakawa.
