Hi I am hydraulic engineer. Please provide me some info drill bit size, surface hardness. I am also manufacture for hile opener (Reamer) for Horizontal directional Drilling Machine. If you want some photos for project I done its available. I also do manufacture hydraulic auger machine complete. Auger design, hydraulic motor selection, gearbox, hydraulic pump, directional valve, hydraulic cylinders for push force and frame fabricstion.
Let me know about the drill bit size and surface hardness only.
Thank you