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 [; ~! s3 \$ f1 L" J3 N5 T3 t/ z( G+ QNOTE:  CS=1000 ft/min for carbide insert used.
! ?1 }' j! I- ]# @2 M; o
# Y& Z) T5 Q: N, s  D! s* |. kso  RPM(1)=      
    RPM(2)=
    RPM(3)=
& V2 J8 X; E( ~    RPM(4)=
. \0 |' i+ V( }3 k/ _
0 m: |. t. K7 `. {  s谢谢指教。