Injongo ephambili kukwenza umphandle wenhlama ibe yimo engqukuva, kwaye wenze igesi yangaphakathi ihlakazeke ngokulinganayo, kwaye isakhiwo silungile.Ngexesha elifanayo, ngokuxutywa kwe-rotary ngesantya esiphezulu, inhlama yenza isikhumba esifanayo, ukwenzela ukuba igesi eveliswa ngexesha lobungqina obulandelayo bentlama ayiyi kubaleka.Ukuze ingaphakathi lenhlama libe likhulu kwaye lifane kakhulu
