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hammer drill is not for drilling metal, it is for drilling through concrete. use a corded drill, with a 1/2" chuck, it should provide the torque needed. also check your drill bit and make sure the tip isn't chipped. also check to see if it is still sharp, if you don't apply enough pressure, don't use lube, and run the drill at med-high rpm's, you can heat up the drill bit and it will be dull.
carbide will solve all your problems, but isn't cheap.
use a drill with a lot of torque and low speed. put lots of pressure on the drill bit and go somewhat slow. using cutting fluid will help keep the drill bit cool and sharp. shouldn't take more than a few minutes to drill through each hole.
since you can't put much pressure on it, and are willing to take it to a machine shop, try taking the knuckle off and drilling off the car so you can put adequate pressure on it.
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