OUCH. I see a possible tap snapping nightmare in the making. I would use a thread froming tap like a Balax instead of tring to cut those threads. It gives more tap strength
by eliminating the deep flute clearance of a conventional tap and provides a stronger thread by extruding and forming the thread much like rolling a thread as opposed to cutting. The drill size is critical with this process though and there are a mutitude of tapping fluids and lubricants available. I can't think of any specific brand to recommend but get one specific to your application which is stainless steel. Ok that is my two cents worth. I wish you the best of luck.
__________________
If it is true a person learns from their mistakes then I must be the smartest man alive. |