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 E- Y* Y# ^, D# ^* C9 RNOTE:  CS=1000 ft/min for carbide insert used.

5 H4 \, Z, \1 Z4 S2 j7 N- qso  RPM(1)=      
7 l2 [, u* I/ M: C    RPM(2)=
    RPM(3)=
' ?7 x% t- }. _7 B    RPM(4)=
2 a9 v% L: s# [2 R" Q5 ?# w
谢谢指教。