... Thai gian may Thai gian may (thai gian gia e6ng) cua may ti~n dU:Qc xac djnh L. 1 0- 3 [ej. 'M ~ Vad r' trong do , L - chieu dai gia e6ng, mm; I ( 2-7 ) K€t ... ( 2-7 ) K€t h9P ( 2-6 ) va ( 2-7 ) ta co cOng thue tlnh thai gian may , L '" ~ s· [,j WCI • ( 2-8 ) o v, v Nhl1 v~y de giam thai gian gia oong, ta. phai ... kh~e ph1,lc. - - - - F = Fz + Fy + Fx' [N] ( 1-2 ) De tlnh ll,tc cat ta dung cOng thlie kinh nghi~m sau ( 1-3 ) trang do : CF, xF' YF' n - h~ 86 vll cae...