Use method and precautions of tapping spanner
First, when tapping with tap by hand on the clamp platform, the following points should be noted
1. Align the tap with the eye hole and judge with the eye to make the plane of the tap and the workpiece perpendicular.
2, the tap will turn, from the front and side, two aspects to observe, check whether the right, that is, whether the tap is perpendicular to the working plane, if necessary, from the front and back side with a square test whether the right, if the tap has been aligned, two turns, still use the above method, check whether the right.
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3, when tapping, if you feel the effort to rotate forward, you can not force rotation, should immediately stop, backward quarter of a turn, in order to remove the tap cutting part and hole around the accumulated chips, and then continue to attack forward.
4. If it is not right, the tap should be turned upside down and re-aligned, otherwise it will tilt the screw hole tapped.
5, when tapping, the force must be uniform, you can hold the wrench with one hand, hold the tap with one hand, rotate evenly, or balance the wrench with both hands, rotate evenly.
6. The wrench used should be suitable for the size of the tap. When twisting the wrench, it is absolutely not possible to lengthen the sleeve on the wrench.
7. When tapping is finished and the tap is rotated backwards, after loosening the tap with a wrench, the wrench cannot be pulled back together. Special care should be taken to prevent damage to the thread and tap in the screw hole.
8. After taking out the tap, pour out the chips accumulated in the thread hole, or pour them out with oil, take them out with the hook, and blow them out with compressed air. Do not blow them out with your mouth, so as not to fly into your eyes.
9, tapping, encounter material stones or motionless, can first use three taps in the good part of the tap back to reduce the cutting force, and then continue to tap tap.
Ii. When tapping with machine taps on machine tools, the following matters should be noted:
1, the center of the screw hole should be in a straight line with the center of the tap.
2, when the tap will enter the bottom hole has been drilled on the workpiece, the application of hand hold, avoid tap and workpiece collision.
3, when tapping on the machine tool, in order to avoid the tap is too heavy and broken, it is best to use tapping tools with protective devices.
4, tapping length on the machine tool or tapping tool positioning accuracy, tapping attempts can not be equal to the depth of the hole, generally should be less than the depth of the bottom hole 1~2 mm, sometimes smaller, specific can be pre-drilled according to the standard provisions.
5, when tapping through hole thread on the machine tool, the tap had better be taken out through the workpiece, do not swing out, in order to prevent possible damage to the tapped thread, tapping through hole thread, can make the machine tool spindle rotate in the opposite direction, back out of the tap.
Three, tapping, should pay attention to adequate cooling
Full cooling can improve the thread finish and tap life, the general use of coolant are the following: A, emulsion, B, mixed oil, C, vulcanized oil, D, vegetable oil. The first several coolants have higher performance but lower lubricity, among which emulsion has the highest coolability and lowest lubricity, while vegetable oil has the lowest coolability and highest lubricity. When high speed cutting, it is better to use floating mixed oil. When tapping taps, if the thread smoothness is higher, vegetable oil and vulcanized oil can be used in addition to reducing the cutting speed.