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.
' K  d5 |5 b7 j3 e5 J# `NOTE:  CS=1000 ft/min for carbide insert used.
% p$ w4 g! S& w: o% G* M( n% M
5 s7 l0 M, k, ]2 _( `so  RPM(1)=      
' f* {+ \2 I, r' f& D/ @    RPM(2)=
, Z, X" c% d( u- D& l" Q* M$ u    RPM(3)=
4 b3 N2 ~$ C5 |1 U    RPM(4)=
2 c0 M; w$ f- Y, G
谢谢指教。