EN8 Steel - Turning and Face Milling

That depends on the Material your turning, the depth of your cut, the finish your trying to obtain, wether or not your using coolant and the type of cutter your using. There are books avalible to give you a place to start. But there is a "feel" to it as well.

Hi There are a basic guide for machining by calculation please refer to this website: http://its.foxvalleytech.com/MachShop3/SpeedCalc/SpeedRPM.htm

and :

http://en.wikipedia.org/wiki/Speeds_and_feeds

Basic :

HSS is High Speed Steel.........Normal cutting Tool for machining.

Carbide Tool ..... is Harder and can cut faster then HSS Tool.

Regards