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.
! q: t* d+ o) Y8 @' x3 A$ k( U
7 `# K  y2 X+ kso  RPM(1)=      
/ F9 R. F9 b; z/ ]1 i* W. D+ Z    RPM(2)=
/ v0 [7 @( \! s6 i9 j. ]7 d4 D& x    RPM(3)=
    RPM(4)=

谢谢指教。