1. Ukuchithwa kogwebu.
Ebusika okanye iintsuku ezinemvula, ngenxa yokuba ubushushu bomhlaba otshisiweyo (i-skeleton yomzimba kunye nobuso bangaphakathi besikhumba sangaphandle, njl. njl.) buphantsi kakhulu, okanye umswakama emoyeni uphezulu kakhulu, kukho ukufuma kwi-workpiece s. ...