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.
7 {$ a: D* N) @7 {% [' GNOTE:  CS=1000 ft/min for carbide insert used.
( ^" N& `6 ^+ Z+ J9 b7 E
so  RPM(1)=      
    RPM(2)=
4 E3 _7 z* J& X7 `1 i    RPM(3)=
: o- k3 Z2 ?7 r; U% n    RPM(4)=

: b* y, X; `2 W" c2 e谢谢指教。