Hellow guys, Welcome to my website, and you are watching 재봉틀의 기본원리/ 바늘에 걸려서 아래로 내려온 윗실에,, 북집이 회전하며 아랫실을 꼬면서 걸어 줌. 공업용은 3,500~6,000 RPM으로 고속회전. and this vIdeo is uploaded by 윤스테크 Yoon's tech at 2021-11-11T03:05:33-08:00. We are pramote this video only for entertainment and educational perpose only. So, I hop you like our website.