Wongola ndi kudula makina abwino, timapereka makina angapo amitundu yambiri, makulidwe apamwamba omwe titha kuchita ndi 3mm,
Liwiro 10-15m / min , ndipo mtengo ndi wotsika mtengo kusiyana ndi kudula kwa mzere wautali, Panthawi imodzimodziyo, onetsetsani kuti kudula kulondola.
Ntchito yosavuta yopangira slitting imatha kuwonjezeredwa (osapitilira mipeni 6, kudula kocheperako ndi 70mm)