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Message: <blockquote data-quote="Hotrod1830" data-source="post: 98260" data-attributes="member: 4331">This may be of no use, but I will say it anyway.Several years ago I rented a hydraulic post hole digger to install a fence. It was REALLY dry here, and it is mostly clay or loomey soil here. I noted that I was having to literally put my full body weight on this machine to get it to dig. Even then, it didnt seem to want to cut thru the clay. I couldnt understand why a auger bit with a carbide tip couldnt cut thru clay.Mind you, it was HOT and in the middle of a drought here that weekend. So I was taking a break between attempting a hole and luckily the auger head was out of the ground when I was looking at it, and it hit me. Either the carbide bit was on wrong, or someone sharpened it wrong. The blunt side of the bit was making first contact. I tried to remove it, but the bolts where covered in dirt and rust. So I just got out the cut-off wheel and created the correct angle on the carbide bit.Sure enough, that was all it took. Bored right into the clay like it was butter after that.In normal soil, it probably did fine. But in drought ridden clay soil, it actually took a sharp edge to cut it and dig a hole.It may or may not help you, but it is worth a look. Don't assume wet clay is easy to cut.</blockquote>