I am new with inconel 718 can anyone help me how to drill a .040 hole
i keep breaking the drills Im going 900 rpm with a 1. FR

give it to someone else to do it. :)

I'll agree with arty.

I did a lot of that at my old job. The best bet is edm.Or you can try, make sure you have a clean surface and not the casting, also use solid carbide around 150-300rpm .01" per peck at .001-.002fpr go about .100 depth then sharpen drill.

If you can't edm it good luck.