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.
; Q0 O: q9 D- `4 Q1 nNOTE:  CS=1000 ft/min for carbide insert used.
6 o; ~6 S+ Q/ u; i5 R% Q5 q
7 _& E$ m/ ], Jso  RPM(1)=      
: {0 p& U- v1 t    RPM(2)=
# e+ o& T% s% p    RPM(3)=
' X5 [+ T, o4 D8 G! ]    RPM(4)=

谢谢指教。