Using Fraday cup and MCP (microchannel plate) measured field emission currents and field ion currents after Ir covered single crystal tungsten tips form pyramid strcture. Tip’s shape affects field emission current more then pyramid strcture. Threshold voltage of field evaporation is affected by sharpness of tip. Satuaration ion current is affected by pyramid structure. Satuaration ion current which is measured with MCP is bigger then satuaration ion current which is measured with Faraday cup 5000 times. Nb {100} can be faceting because Nb{310} expands after annealing.