Umsebenzi wejoyinti yerabha kukutywina okuphakathi, kwaye injongo kukuthintela okuphakathi ngaphakathi kwerabha ekuphumeni. Umbindi lulwelo olukwinkqubo yothumelo lwejoyini yerabha, ngoko ke umsebenzi wejoyini yerabha kumbhobho kukutsala umothuko nokunciphisa ingxolo. I-burrs yejoyini yerabha inkulu kakhulu, kwaye i-mold isoloko isetyenziswa ngexesha lemveliso. Emva kokubumba, kufuneka igalelwe ngaphandle kwesikhunta. Kwiimeko ezininzi, irabha edibeneyo yerubha enye iya kuba ne-burrs emva kokuba i-mold ikhululwe, kwaye imveliso kunye neziphelo zegalelo zejoyinti yerabha zinezixhobo zokutywina.