Just make sure your bits are sharp; thats the only real advice i can give
I actually use mine for tapping too; starting the taps, at least.
Put the tap in the press, lower it into the block (buy a drill press clamp, obviously) and turn the belt by hand until it grips. Then remove the press clamp, and tap. Makes for perfectly straight taps every time.
Of course, you probably know this, but on the off chance you dont, hopefully its helpful.