What I learned about drilling concrete

I just got through doing the same thing on a friends 4 post last weekend. About 5 years ago, I bought a brand new Bosch SDS chuck hammer drill in an estate sale. I paid 20 bucks for it, but I probably have over 200.00 worth of bits now. The secret to a hammer drill is to start the hole with a some pressure & then just keep gentle pressure on the handle of the drill. Before I retired, I was using my drill at least 3-4 days a week at least 4-5 hours a day. I've worn out more bits than I have right now.