CNC题目,再请教。

27149

A 6.5 inch dia shaft is to be machined on a TURNING CTR to 4.5 inch dia in 4 equal cuts. If CONSTANT CS is selected calculate the RPM at the beginning of each cut.
" q' b5 e) X5 v- QNOTE:  CS=1000 ft/min for carbide insert used.
, A4 T, y: s2 O+ O
$ W+ p) F5 G' B1 }- Z/ Fso  RPM(1)=      
! \! [8 ]/ m; x& E  a    RPM(2)=
    RPM(3)=
! ~& b$ G' ~$ n, u& d  x    RPM(4)=
4 \7 W8 u+ y) {
2 @9 O! E& i0 k. S谢谢指教。