Makina a crank music box, omwe amadziwikanso kuti crankshaft music box kapena music box crank, ndi chipangizo chachikhalidwe chomwe chimagwiritsidwa ntchito popanga nyimbo ndi nyimbo zokongola. Makinawa nthawi zambiri amakhala ndi shaft yokhomeredwa pamanja yomwe, ikatembenuka, imayendetsa magiya ndi mapini angapo, zomwe zimapangitsa kuti chisa chachitsulo chizule mano a silinda kapena disk.
Pamene mano a cylinder kapena disk akudulidwa, amatulutsa zolemba za nyimbo, zomwe zimapangitsa kuti pakhale nyimbo zosangalatsa zomwe zimagwirizanitsidwa ndi mabokosi a nyimbo.
Mchitidwe wa kutembenuza nyimbo bokosi crank ndi kuchitira umboni ntchito zovuta za limagwirira akhoza kubweretsa chisangalalo ndi zodabwitsa kwa onse ana ndi akulu mofanana.Music bokosi crank zambiri amapezeka zosiyanasiyana nyimbo mabokosi, kuphatikizapo chikhalidwe matabwa mabokosi nyimbo, zachilendo nyimbo mabokosi, ndi kukongoletsa Collectible nyimbo mabokosi. Mapangidwe awo osatha komanso osatha akupitilizabe kukopa okonda nyimbo ndi osonkhanitsa padziko lonse lapansi, zomwe zimawapangitsa kukhala chosungirako chosangalatsa kwa mibadwomibadwo.