Fly Cutter RPM

[YYCHM]

When running a Fly Cutter on a mill should one use recommended turning RPM or milling RPM. There is quite a difference between the two.

Thanks

 

[Tom Kitta]

Speeds are exactly the same - see
https://www.custompartnet.com/calculator/milling-speed-and-feed
and
https://www.custompartnet.com/calculator/turning-speed-and-feed

For 2 inch fly cutter I got 191 rpm with 100 SFM (mild steel, top speed for HSS).

It is also 191 rpm for turning 2" shaft with 100 SFM.

 

[YYCHM]

Oooops…. Me bad. I entered the tool diameter incorrectly when I calculated milling RPM.

They are the same. I was getting 200 for turning and 2000 for milling.

Thanks Tom.