Moetsi e mong ea hloahloa oa lisebelisoa tsa merafo o tla ho re etela Ke batla tharollo ea tse khololisebelisoa tsa merafo.Ba se ba ikopantse le barekisi ba bangata pele ba tla , empa ha ba ka ba fumana maikutlo a matle mabapi le tlhahiso ka lebaka la bophahamo ba modumo .

Ha ba tla, ha rea ​​ka ra ba bontša feela bokhoni ba likere tsa cylindrical empa le bokhoni ba lisebelisoa tsa bevel, ba khahliloe haholo ebile ba thabile.

Mookameli oa thekiso James o fane ka tšepiso ea puisano e tebileng bakeng sa bohle ba bona ring gearle merero ea li-bevel gears.