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.
6 s6 M5 s/ D5 @3 x  @NOTE:  CS=1000 ft/min for carbide insert used.

% d+ \3 _( ~: ]0 O* lso  RPM(1)=      
; r  K! ?& ~2 ]* L    RPM(2)=
7 F& p/ `) s! ?) Y& s) n) u    RPM(3)=
# _% ]: a) d+ ~/ R$ z+ n$ V1 Q/ O    RPM(4)=
% h0 e& H# _$ j6 v  Q3 g; f
谢谢指教。