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.
: F8 G2 W0 N% gNOTE:  CS=1000 ft/min for carbide insert used.

so  RPM(1)=      
    RPM(2)=
    RPM(3)=
6 O: S. @6 b; \1 \, o    RPM(4)=
) V( @; q2 u5 l
谢谢指教。