Helical gear ye kɛnɛma silinda-minɛn ye min ɲinw bɛ jɛgɛn cogo dɔ la ka ɲɛsin aksidan ma sanni ka kɛ a ni a cɛ. N’an y’a Fɔ cogo nɔgɔman na, gese helical (minɛn) ɲinw bɛ Bɔ aksidan na ni kɛrɛ kɛrɛnkɛrɛnnen dɔ ye, o bɛ Kɛ sababu ye k’u ka sὲnɛ-yɔrɔ lamini ni ‘fɛn ye min bɛ Kɛ ‘fɛn ye.