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.
6 f* i8 r% e2 W4 m- M0 ANOTE:  CS=1000 ft/min for carbide insert used.
( ^: c6 S1 @0 }5 y
' w' h* q% s& g. j1 i; @- ^so  RPM(1)=      
    RPM(2)=
    RPM(3)=
3 M9 z% r( H9 E) I    RPM(4)=

$ s/ R9 F- W. B. w; A谢谢指教。