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.
NOTE:  CS=1000 ft/min for carbide insert used.

so  RPM(1)=      
0 i0 [; Q: N9 V  B- V3 m    RPM(2)=
: a" ]+ {$ }4 c1 @    RPM(3)=
; j# ^4 o7 @7 R) V. I/ c  v    RPM(4)=
4 w, l/ x! u& Z' ?
谢谢指教。