High kubala mphamvu ya mankhwala kupewa kukhudzana pakati zitsulo akhoza kubweza malire mphamvu zabwino abrasion kukana, moyo wautali wa mikangano linalake ndipo tikulephera makina kugwedera dustproof kwenikweni zabwino kwambiri, kulola kunja kalozera njanji ofananira nawo katundu akhoza odzipereka ophatikizidwa chiwongolero cha madzimadzi. Dynamics ilibe vuto chifukwa thanki yonse ndi yosavuta, ndipo mtengo wokonza zosavuta ndi wotsika chifukwa cha mphete yovala, imatha kuwonjezera malo osindikizira a extrusion.