Moetsi e mong oa lisebelisoa tsa merafo ea boleng bo holimo o tlile ho re etela ea batlang tharollo bakeng sa khololisebelisoa tsa merafoBa ile ba ikopanya le bafepedi ba bangata pele ba fihla, empa ha ba a ka ba fumana maikutlo a matle ka lebaka la bongata ba ntshetsopele.

Ha ba fihla, ha rea ​​ba bontša feela bokhoni ba li-gear tsa rona tsa cylindrical empa hape le bokhoni ba li-gear tsa bevel, ba khahliloe haholo ebile ba thabile.

Motsamaisi oa theko James o fane ka tšepiso ea puisano e tebileng bakeng sa bohle ba bona likere tsa lesalele merero ea li-bevel gear.