Mr Danuser,
thank you. No one would know this topic better than you
.
My continuing question remains as to what reasonable expectations are for a standard auger bit performance vs. a rock bit in rocky clay soil? Some of the granite rocks taken out were ten inches wide. Nothing bigger but that's no small rock for sure. And if I hit a big rock I know I have to get it out with a bar, not the phd. The oem shear pin was in place, and still is in place.
So maybe this was a simple case of a junk part getting in the mix. But would it be reasonable to expect that the point would not fail before the shear pin?
I thought so, but if this really was a cast iron point, then I'm not at all surprised it broke. But more importantly for me, I don't want to put the same thing back on and have it break again on the same kind of rocks. So I think the smart thing to do is spec a replacement point that is forged, not cast.
Would you agree? Many thanks. Drew