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.
& Y# j0 H7 ~8 c8 [0 x" `NOTE:  CS=1000 ft/min for carbide insert used.

! M( `3 O% q6 }+ n% M& qso  RPM(1)=      
    RPM(2)=
    RPM(3)=
  r9 N" @5 q: \+ C8 a# D    RPM(4)=
/ q& i& F9 A% [% x0 i; G* _
谢谢指教。