57 a T ypical fractures caused by excessive bendingleverage of the demolition tool W arranty claims rejected bT ypical of high stress fracture usually caused by using the tool as an anchor to pull the machine W arranty claims rejected cT ypical fracture caused by levering tool while buried in the burden W arranty claims rejected d T ypical fractures caused by blank fring andor excessive chuck bush weardamage W arranty claims rejected e T ypical fractures caused by blank fring andor twisting of the tool due to worndamaged retainer pin W arranty claims rejected f T ypical fracture caused by lack of lubrication andor chuck bush weardamage W arranty claims rejected g Mushrooming this is caused by driving the chisel or point into hard dense material for too long a period of time without penetration This generates intense heat softening the point and causing it to mush room This is not a manufacturing fault W arranty claims rejected h Note fatigue lines originate from the internal point not outer diam eter V ery rare failure type due to steel defect 100 warranty accepted 6 T ypical F ailur es Guide to W arranty Claims B L T ools are manufactured from frst class materials and then heattreated to produce tools with optimum fatigue and wear resistance When a tool has apparently failed to give satisfactory service life a brief visual inspection can often give a quick indication of the cause