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 {+ }& c7 h& L6 PNOTE:  CS=1000 ft/min for carbide insert used.
* b* g" h$ c5 r: A" E  F& `. O
so  RPM(1)=      
    RPM(2)=
: Z/ K: a1 M2 \, d7 w6 i    RPM(3)=
/ k+ w2 H4 z( p8 p0 t. w) ^- S- N    RPM(4)=

谢谢指教。