Karya tauri dangane da girman hatsi da abun ciki na cobalt.

Lokacin da aka fallasa kayan abu zuwa damuwa na waje, wannan yana haifar da tashin hankali na inji.A ƙarƙashin waɗannan yanayi, duka ƙarfi da ductility na kayan suna nuna tushen ma'anar tauri.A wasu kalmomi, ana bayyana taurin a matsayin ƙarfin da zai iya tsayayya da karaya ko haɓakar girma.Ana amfani da "Hanyar Palmqvist" akai-akai don tantance ƙimar tauri, KIC.

Da fatan za a saka kamar haka don yin oda:

*Kayan Waya, Karamin Karfe Karfe.Matsakaici Carbon Karfe.Babban Karfe.Bakin Karfe.Brass.Aluminium.Iron.Mafi inganci tare da Code of Materials.

* Salon kai, da fatan za a saka lokacin da kai da mai wanki.

* Bakin dunƙule, da fatan za a saka lokacin da aka yi amfani da shi don madaidaicin dunƙule.

* dunƙule triangle, da fatan za a saka diamita na waya lokacin amfani da dunƙule alwatika.

* dunƙule mara misali, da fatan za a haɗa zane ko samfurori lokacin amfani da dunƙule mara kyau.

Tambayoyi gama gari a cikin amfani da screw da goro mold:

1. Babban ma'aikacin yana da kwarewa na mold da tsarin tsarawa , yana nazarin dalilin rashin daidaituwa na rarrabawar mutuƙar damuwa da lalacewa.

2.Tsaftawar mold, ƙarshen rami na ciki bai isa ba.

3.The rigidity na harsashi hannun riga abu, da zafi juriya, da zafi magani taurin ne m.

4.In domin ya ceci kudin da samar, sun zaba matalauta ingancin tungsten carbide karfe da waya sanda, gami dalla-dalla da kuma sata kayan ƙusa tsanani ƙafafun ne m.

5.The karo bai dace ba, ba tare da maye gurbin lubricants da na'ura mai dubawa na dogon lokaci ba.

6.Maigidan ma'aikaci na daidaitawa dole ne ya sami babban matakin fasaha.