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.
5 ~! x& h9 d4 R0 w. U2 ENOTE:  CS=1000 ft/min for carbide insert used.
* B8 H2 @9 o- U) V( T
so  RPM(1)=      
3 p8 G* q5 W0 V; ]) ?    RPM(2)=
& G( n  i9 F/ o* Z* Q: f0 d1 I    RPM(3)=
    RPM(4)=

) j& o# ~5 ]) ?' j4 `# Q3 {! m8 U谢谢指教。