1.The orifice of the threaded bottom hole on the workpiece shall be chamfered, and both ends of the through hole thread shall be chamfered. The position of the workpiece clamp shall be correct, and the center line of the threaded hole shall be placed in the horizontal or vertical position as far as possible, so that it is easy to judge whether the tap axis is perpendicular to the plane of the workpiece.

3.At the beginning of tapping, try to put the tap right, then apply pressure to the tap and turn the winch. When cutting in 1-2 turns, carefully check and correct the position of the tap. Generally, when cutting 3-4 turns of thread, the tap position shall be correct. In the future, only turn the winch and do not put pressure on the tap, otherwise the thread profile will be damaged.

5.When encountering a screw hole that cannot be tapped, always exit the tap to remove the chips in the hole.

7.When replacing the latter tap during tapping, screw it into the tapped thread by hand until it can no longer be screwed in, and then turn it with a winch. When the final cone is finished and withdrawn, it is also necessary to avoid rotating the winch quickly and screwing it out by hand, so as to ensure that the quality of the tapped thread will not be affected.

8.During machine tapping, the tap and screw hole shall be coaxial.

9.During machine tapping, the calibrated part of the tap cannot be out of the head, otherwise it will produce disordered teeth when the tap is pulled out in reverse.

10.The cutting speed during machine tapping is generally 6-15m / min for steel; Quenched and tempered steel or hard steel is 5-10m / min; 2-7m / min for stainless steel; Cast iron is 8-10 M / min. For the same material, the smaller the tap diameter, the higher the value, and the larger the tap diameter, the lower the value.

2.At the beginning of tapping, try to put the tap right, then apply pressure to the tap and turn the winch. When cutting in 1-2 turns, carefully check and correct the position of the tap. Generally, when cutting 3-4 turns of thread, the tap position shall be correct. In the future, only turn the winch and do not put pressure on the tap, otherwise the thread profile will be damaged.

4.When tapping, turn the winch back about 1 / 2 turn every 1 / 2 turn, so that the chips can be easily discharged after breaking, and the phenomenon of tap rolling caused by chip sticking on the cutting edge can be reduced.

6.When tapping the screw holes of plastic materials, add lubricating coolant. For steel materials, oil or emulsion with high concentration is generally used, and vegetable oil or molybdenum disulfide with high requirements can be used. For stainless steel, No. 30 engine oil or vulcanized oil can be used.

In addition, professional lubricant is also needed in tapping, which can effectively reduce the friction between workpiece and tapping, reduce wear, have strong oil film, prevent scratch and wrinkle on workpiece surface, and effectively improve work quality and efficiency. At the same time, inhibit the temperature rise, reduce the effects of sintering and bite, prolong the service life of the die, protect the tools, inhibit the generation of black sludge and do not corrode the workpiece; Excellent cooling effect.

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