Please note the following conditions that must be met when doing such: Through the spindle coolant (will not work with out this one) Done in a horizontal application starting at the bottom of the work piece and moving upwards which allows for better chip evacuation. Use no bigger than a 2.5 dia plunger (unless you have more than a 50 HP machine) 70% tool engagement when steeping over. I have done this several times and have had success with it. Try running it at around 1500 SFM and at around .0065 per rev on the feed. I know this sounds slow but chip evacuation is emperative and if you go any faster than that you will load up the tool. As for the stress if it is anything other that 7050 you will probably be alright. Good Luck Matt C