Quickly take out the tap of the folding machine

1. When the broken tap exposes the working surface for a long time, it can be unscrewed with pliers.

2. When the broken machine tap exposes the surface of the workpiece only 2 to 3 mm, use a flat steel with a thickness of 2 to 3 mm and a length of 150 to 200 mm to drill a hole at a length of 1/2 (the diameter of the hole is tapped). The outer diameter is), and the flat steel is placed on the broken taper, and the flat steel and the shaft end face have a gap of 0.5 to 1 mm. The broken wire tap and the flat steel are firmly welded together by electric welding. The welding should be first welded from the center of the tap and gradually welded with the flat steel. After the broken tap is naturally cooled, the oil is injected into the flute of the broken tap, and the flat steel is gently pulled left and right to loosen the broken tap, and the tap can be easily taken out from the shaft. It is also possible to weld with a hex nut having an inner diameter slightly larger than the diameter of the tap.

3. When the broken part of the tap is in the hole, you can screw 2 nuts on the broken taper with square ridge, insert the wire (the same number of taps and the number of taps) into the empty groove of the broken tap and nut, and then press with the hinge Pull the square in the exit direction and take out the broken tap. If it still cannot be taken out, the tap can be annealed with an acetylene flame or a blown lamp, and then drilled with a drill bit. At this time, the diameter of the drill should be smaller than the diameter of the bottom hole, and the drill hole should be aligned with the center to prevent the thread from being drilled. Insert a flat or square punch and use a wrench to unscrew the tap.

Note: The breaking of the tap is often caused by a large force, so that the cutting edge of the half tap that is broken in the screw hole is tightly wedged in the metal, and it is generally difficult to make the cutting edge of the tap The metal is detached, and in order to make the tap loose in the screw hole, a vibration method can be used. When vibrating, use a pointed chisel to reach the chip pocket of the tap. Use the hammer to repeatedly tap the thread in the forward and reverse direction until the tap is loose.