I've still got an old Phillips 747 hammer drill that I used to use for driving ground rods. It is bulky enough to drive in hard dirt and the chucks for the self drilling anchors hold to the rods pretty good. One of the things about using a hammer drill is the mass of the drill has to be pretty good because of the mass of the rod. Takes a while to get a rod in caleche though. That is where using a 45 degree angle works better. It is also easier to drive at a 45 with a hammer drill than a sledge or slide driver. I got the 747 from a pawn shop for $300 back around 1990. It was the whole outfit and 2 or 3 carbide bits.
[This message has been edited by gpowellpec (edited 07-15-2001).]
