I almost always roll tap (form tap) blind holes. Are you using a gun tap (straight flute)? Is so, you need to make sure you drill plenty deep for the chip clearance since these taps will push the chip down. You can use a spiral fluted tap which will "pull" the chip out back as it taps. At 1" depth you might have to watch the LOC of the tap though because the chip might pack the back side towards the bottom of the hole and break the tap. I would say roll tap it.
One other thing, are you rigid tapping with a floater or solid holder? Floaters will generally need a little more room on the bottom clearance.
It's just a part..... cutter still goes round and round....