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.
! x6 n( |1 D( W6 _* w6 p$ PNOTE:  CS=1000 ft/min for carbide insert used.
! B/ }1 S; V; r5 t4 r4 p- y
so  RPM(1)=      
    RPM(2)=
& m: R7 A2 \; ^2 k0 ?, \( A    RPM(3)=
    RPM(4)=

谢谢指教。