Ngati pali oxides kapena dothi pamwamba pa workpiece ndi elekitirodi wa wapakatikati pafupipafupi malo kuwotcherera makina, izo mwachindunji zimakhudza kukana kukhudzana. Kukana kulumikizana kumakhudzidwanso ndi kukakamizidwa kwa ma elekitirodi, kuwotcherera pano, kachulukidwe kapano, nthawi yowotcherera, mawonekedwe a elekitirodi, ...
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