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.
5 v# p0 }0 i$ k5 ~8 A. J5 O/ s0 x7 iNOTE:  CS=1000 ft/min for carbide insert used.
  e/ }* F0 q( O
* I* B9 }6 j) a' P  Uso  RPM(1)=      
    RPM(2)=
  X8 B( Q4 y" _+ f& J    RPM(3)=
% g" v* c8 k# Z. \2 v! r    RPM(4)=
! `: _& t. Y7 [( s  H# A
谢谢指教。