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.
$ u6 d" o! c' tNOTE:  CS=1000 ft/min for carbide insert used.
1 I9 u5 ^) Z/ }' b
( T2 ^+ s) ^& z( q* Y+ ^2 `, e: \so  RPM(1)=      
    RPM(2)=
# t8 c4 r4 j3 w9 Z- b  C    RPM(3)=
    RPM(4)=
+ G& G# q/ ~5 c+ ^
6 B: C, I  S" P  p$ |$ v# |谢谢指教。