Bricks, Masonry, Asphalt and Concrete - Hammer Drill doens't work

I bought a 6AMP Black & Decker 1/2" VSR Hammer Drill ($59) and an 1/2" Bosch Industrial Hammer Drill Bit to drill holes on slab for 4x4 post bases. The drill did have hammer action and in forward direction but only drill down about 1". I tried two locations, both failed. What could be wrong?
Thanks for any help.

Too much drill bit too little drill
Try drilling a smaller hole first and work your way up to 1/2"

A 6 Amp hammer drill is a misnomer. A hammer drill requires real power. More than a cordless is going to provide, even at 24 Amps.

Thanks and I'll buy a smaller bit and have a try. I checked the 1/2" drill bit, the edges wore out but not the tip, I guess it couldn't cut thru stones in concrete. I'm wondering if the hammer action was not strong enough or speed was too high.

Jeff,
I forgot to mention the drill is 110V 6AMP corded.

i recommend a bigger hammer drill...........mainly one with a SDS shank for more abuse. Ive found a cheap one locally for 100 dollars and i perfect for every now and againers(pardon my lousy english) the drill you have to me is useless unless you are drilling nail holes to attach 2X4s to concrete. Even then id get the bigger drill with more power. The best ive seen is Hilti which the king of hammer drills but very pricy 600 to 1500 dollars. theres my 2 cents. keep us updated!!!1

sharp bit-high speed-low pressure. Let the drill do the work.

The cheap SDS hammer drill from Harbor Freight (around $65) drills 1/2" holes for plate fasteners like it was going thru butter.

are they 65? I thought they were 99 bucks!! Anyway its a good bargain...........

Thank you all and I will buy a 1" SDS hammer drill from Ebay and let you know the results.