I am trying to tap about 20 holes in an aluminum part I am making out of 6061 T6. The hole is a through hole that is .25 deep. I am using a 95 Haas vf-2with ridged tapping. My problem is I am breaking taps on the first hole. I am using a spiral point 2-56 tap. It goes in about .2 and snaps off. I have never needed to tap something this small before. I have done tapping on this machine 1/4-20 and up just fine. Any suggestions?