I want to make a screw thread inside a tube (the internal diameter of the tube is 1.55mm) then make a screw from wire to screw into the tube.
I bought a small tap and die set but maybe its not the best and I managed to break one of the taps already and still not managed what I want. It was a set 07-20 and I was told they were millimeters which made me think I'd have no problem but they just dont match up
Can anyone tell me now to calculate what I need or better still what tap and die to buy that will do what I want? I dont want to spend a fortune either as its just an idea that may not work at the moment.
Thanks
Helen