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.
1 Z' O$ U9 S  V: C9 VNOTE:  CS=1000 ft/min for carbide insert used.
) J$ |. v4 w/ E' d' }
6 \+ X/ t( v/ D3 Z% N3 zso  RPM(1)=      
3 r0 P2 u9 C7 f    RPM(2)=
& A1 ]" {. F$ K" A( @    RPM(3)=
    RPM(4)=
3 T1 G- V( B8 q# J5 T
* x/ S1 F) C- [) ?1 T+ h谢谢指教。