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.
NOTE:  CS=1000 ft/min for carbide insert used.

) g: ?4 U6 @/ ?+ H( H0 `so  RPM(1)=      
    RPM(2)=
    RPM(3)=
  h$ H7 Q- L5 _2 b9 _    RPM(4)=

谢谢指教。