The Time a Coolant Hose Nearly Cost Me a Job
I was drilling a batch of hydraulic cylinders on a tight deadline. The job was going smoothly — good chips, good surface finish, ahead of schedule. Then the coolant hose burst. The Setup That Day I was running a 22 mm gun drilling operation on 4140 steel. The depth-to-diameter ratio was about 40:1, so coolant pressure and flow were critical from the start. I had the pressure set to 80 bar at the pump, and the return flow was steady through the chip separator. The first twelve parts came out perfect. I was feeling confident enough to let the machine run while I prepped the next batch of raw stock. ...