When using manual wire to attack the thread, the taps are often broken. Wire breaking is closely related to the shortcomings of tap structure besides the lack of experience, skills, improper methods and quality of taps.

Analysis of the cause of taps breaking

1, in the process of tapping, because the manipulator's hands are not balanced, the direction of the force is changed and the taps are broken. This happens more in the smaller diameter of the thread.

2, bottom outlet aperture and the wire tapping does not match. For example, the processing of M5 * 0.5 threads, this should be used to 4.5mm drill hole, if used to apply to M5 &Oslash, 4.2mm bit processing, because small aperture, does not match with the tap, torque will increase. At this time, if the manipulator is still not found to use the wrong bit to inherit the tapping, the taps will inevitably rise.

3, when processing blind hole thread, when the tap is going to touch the bottom of the hole, the operator doesn't realize that the tap will still be delivered to the bottom of the hole, so the tap must be broken.

4, processing of blind thread tap, if there is a chip department failed to discharge and filling in the hole at the bottom of the operator if forced inheritance tapping, must break the tap.

5, the quality of the taps itself is subject to the problem, which is also one of the reasons for the taps breaking in the tapping process.

6, start tapping, tap start positioning is not accurate, the axis and the tap of the central line is not concentric torque in the tapping process is too large, this is the main reason for the tap tap break, which caused a broken tap phenomenon than the factors caused by broken combined. On this tap and bottom are not concentric phenomenon, seems to be the operator's skill subject, but actually because of deficiencies caused by tap structure. The front end of the manual taps used are all conical. The initial working face and the bottom is the point contact, tap and bottom of the concentricity depends on the operator's skills and experience to keep, not only to make the tap perpendicular to the bottom surface of left and right sides, and to keep the bottom before and after perpendicular to the face, but also tap in the force balance under both hands twist tap. It is difficult for manipulators who have poor technical level to finish the work. Even a skilled technician who has a better technical level does not have a good grasp of the manual tapping homework every time.

Preventive measures for taps breaking

1, strengthen the skill training and technical training of the workers, improve the theoretical level of the manual tapping, and grasp the actual manipulation skills in the tapping.

2. Improve the structure of the taps. The cone is additionally arranged at the front end with 5 ~ 10mm in length, diameter and drill of the same diameter cylinder, the tap and bottom can automatically maintain concentric guide parts, so that the tap itself has started automatically when in tapping and the bottom keep concentric function. The taps, can be avoided due to the tap tap and bottom heart broken phenomenon, also can prevent tap due to bottom hole and tap, broken phenomenon. At the same time, because the tap may enter does not match with the tap hole, thus can effectively prevent the misuse of a bit manipulation.

Hangzhou GSR-Threads Tools Co.,Ltd

Address：No.381,Tianjiali,Tianfeng Village,Yiqiao Town,Xiaoshan,Hangzhou,311258,China

Tel：     +86-571-826 883 63

Phone：+86 182 584 02850

Fax：    +86-571-838 647 37

E-mail：info@gsrthreads.com