1. Lakoko idanwo naa, iyara gbigbe ti chuck ko yẹ ki o kọja 3 mm / min.Nigba ti igbeyewo, ti o ba ti asapo mandrel ti bajẹ, igbeyewo pawonre.
2. Nigba awọn ilana ti a dabaru rivet nut sinu asapo mandrel, ti o ba ti asapo mandrel ti bajẹ, ni igbeyewo invalid.
