I have to tap M2.5 X 0.45 6H x 6MM Deep blind hole and I only have 1 tap. It's not really right for this job it is a four straight flute type, I have some spiral flute taps comming next week. The material is 6061-T6. Machine is a Hatachi Seiki mini center mill 30 taper. I am thinking 1000 rpm any suggestions?