Chifukwa
1. Tsamba lopingasa silili lakuthwa ndipo masamba awiri opingasa ndi osafanana-mmwamba.
2. Pakatikati pobowola ndi shank concentricity sizikukwaniritsa zofunikira.
3. Makinawa ali pamtundu wolakwika wa spindle.
4. Kukonzekera kwa bolodi (zojambula) kukuyenda.
5. Kuzungulira kwa spindle ndi liwiro la wodula sikufanana.
6. Ma adapter concentricity ndi otsika ndipo deta ina yaukadaulo siili yoyenera.
Chifukwa
1. Mfundo yapakati ndi shank ndi yolakwika, kapena malo apakati si akuthwa.
2. Chojambulacho chikuyenda pobowola.
3. Kuthamanga kwa spindle ndi liwiro la chakudya sikufanana.
4. Ma adapter concentricity ndi otsika ndipo data ina yaukadaulo siili yoyenera.
5. Spindle ya makina otopetsa ndi otayirira kapena owonongeka.
Chifukwa:
1. Mphepete mwa tsamba silakuthwa, chobowolacho chiyenera kusinthidwa.
2. Spiral groove (chip groove) ndi kupanikizana komwe kungapangitse kuchotsa chip molakwika.
3. Zojambulajambula (zinthu) ndi chinyezi chopitirira malire kapena mtundu wa guluu si wabwino (makamaka fiberboard ndi plywood).
4. Liwiro la chakudya cha chida sichikugwirizana ndi zinthu ndi kuya.
5. Sankhani yoyenera kubowola pokha mtundu kwa processing zipangizo.
