03-04-2015, 06:33 AM
My plunger / diesinker EDM machine uses magnetically attached DTIi's by original design, which dates from probably the 1980's. Never had any problem with the DTI's action. However the magnets, which are cylindrical, are recessed into a steel block and surrounded by a brass tube, so forming a sort of toroidal horse shoe magnet. By this design I presume that the lines of force are directed away from the DTI
Andrew Mawson, proud to be a member of MetalworkingFun Forum since Oct 2013.