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.
* u4 y1 S% Z+ H7 t5 h9 E- r0 `/ ^NOTE:  CS=1000 ft/min for carbide insert used.
/ y# g# @; Z) {2 d
so  RPM(1)=      
    RPM(2)=
    RPM(3)=
: c- s- j4 U3 G1 k/ D    RPM(4)=
7 f4 A6 p3 `, m. k! J8 u
9 p( W- b: ~, z8 [谢谢指教。