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.

+ c& G- k$ [2 tso  RPM(1)=      
: V' z# D7 d3 x/ s1 ^( r# @    RPM(2)=
    RPM(3)=
    RPM(4)=
: t# I  |, [4 _5 U% B% R1 X
谢谢指教。