Kwishishini lokupakisha ngesinyithi, ngakumbi xa ujongana ne-aluminium kunye ne-aluminium alloys, indima yoomatshini bokusika ibalulekile. Ezi matshini zenzelwe ngokukodwa ukusika kunye nobumba izinto zokupakisha zibe kubukhulu obufunwayo, ukuqinisekisa ukuba imveliso yokugqibela ihlangabezana nemigangatho eqinileyo yeshishini. Ukuqonda ukusebenza kunye nezibonelelo zoomatshini wokunciphisa kunokubalulekile i-ben.