Need Help!- aerospace drilling

[jamiefegan]

Hello all, was wondering if anybody could help me. I am about to be machining S106 nitritic 3%Cr-Mo aerospace/crankshaft and autosport steel and i would like to know some suggestions or tried and tested figures for drilling speeds and feeds. I have machined S144 before but the chemical compo is quite different. Should i try similar s&f's?

Any feedback would be great, ta J.

P.S First time user/thread (don't even know what one is) hopefully this gets read.

[mgb1974]

What is the size of the hole and also the depth??

Carbide is a must, I can help you out more once I get more information.

[g-codeguy]

Not trying to be a smarta$$ here, but a good place to start is by calling the manufacturer of the drill you will be using. I will say that their speeds and feeds (feeds especially) are sometimes a little high. But then they make money selling the drills.