Kulimba kwa fracture poyerekezera ndi kukula kwa tirigu ndi zomwe zili ndi cobalt.

Pamene zinthu zimakhudzidwa ndi kupsinjika kwakunja, izi zimabweretsa zovuta zamakina.Pazifukwa izi, mphamvu zonse ndi ductility za zinthu zimasonyeza maziko a lingaliro la kulimba.Mwa kuyankhula kwina, kulimba kumatanthauzidwa ngati mphamvu yokana kusweka kapena kuphulika."Palmqvist Method" nthawi zambiri amagwiritsidwa ntchito kuti adziwe kuchuluka kwamphamvu, KIC.

Chonde nenani motere poyitanitsa:

*Zida Zawaya,Chitsulo Chotsika Kaboni.Chitsulo Chapakati cha Carbon.Chitsulo Chapamwamba cha Carbon.Stainless Steel.Brass.Aluminium.Iron.Optimum with Code of Materials.

*Masitayelo amutu, chonde tchulani pomwe mutu uli ndi washer.

* Hollow screw, chonde tchulani ikagwiritsidwa ntchito popanga screw.

* wononga katatu, chonde tchulani mainchesi a waya mukamagwiritsa ntchito wononga makona atatu.

* Non-standard screw, chonde phatikizani zojambula kapena zitsanzo zikagwiritsidwa ntchito pa screw standard.

Mafunso odziwika pakugwiritsa ntchito screw ndi nut mold:

1. Mphunzitsi waluso ali ndi chidziwitso cha nkhungu ndi mapangidwe apangidwe , kusanthula chifukwa cha kugawa kosamveka kwa chiŵerengero cha kufa kupsinjika ndi kusinthika.

2.Ukhondo wa nkhungu, kumaliza dzenje lamkati sikukwanira.

3.Kusasunthika kwa zida za manja a chipolopolo, kukana kutentha, komanso kuuma kwa chithandizo cha kutentha ndizosamveka.

4.Kuti apulumutse mtengo wopangira, adasankha chitsulo chosauka cha tungsten carbide ndi waya wa waya, mafotokozedwe a aloyi ndi kuba zinthu zokhomerera mawilo akulu ndizosamveka.

5.The collider si yoyenera, popanda kusintha mafuta odzola ndi kuyang'ana makina nthawi yaitali.

6.Wogwira ntchito yokonza ayenera kukhala ndi luso lapamwamba.