I use my cordless drill to tap down to 6/32 I can go smaller in my drill press, but then my drill press is 3 phase variable speed and reversible. I have a set of drill/taps that would be perfect for tapping a bunch of holes in plastic. Drill and tap with one bit. Also, I love the spiral point taps for tapping under power.
Click image for larger version. 

Name:	IMGP4554.jpg 
Views:	308 
Size:	197.2 KB 
ID:	33326