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.
" b; `; z" T/ v! m! y) V
so  RPM(1)=      
    RPM(2)=
    RPM(3)=
$ p9 _" ~; e; u9 h4 {1 ^    RPM(4)=
! P+ w( u. V, h. S& A+ ^
6 N6 N1 `. m/ V谢谢指教。