Gacanka kooftada gudaha ee burburiyaha waa gacan-kooreed gaar ah oo loo isticmaalo rullaluistemadka daloolka cylindrical ee jir burburiyaha.
Gacan-ku-qabsaha wuxuu ka kooban yahay baadiyaha koonka ah, lowska qufulka iyo weelka qufulka.
Gacmaha la riixo ayaa lagu heli karaa 1:12 iyo 1:30 qaabaynta taper
Gacan-ballaadhinta gacanta (oo loo yaqaanno gacan-ballaadhinta ama gacanta ballaadhinta) waa nooc casri ah oo cusub oo qalabka farsamaysan ee horumarsan hagaajinta qalabka.