I am currently designing an ROV manipulator arm, it has to cut mild steel cable 20mm thick and mild steel rod 12mm thick. Also it has to operate at depth of 600m. I am struggling with some calcualtions, I have chosen a cable and bar cutter, this forces a shaped cutter against the object and slices it in two. These are widely used however I cannot find any calcs to find cutting forces required and therefore what the hydraulic requirements are. Can anyone help?