The top of the set screw should be buried in the ring. Similarly, the shell-type couplings that join the two shaft ends, the bolt tops and the nuts, should be hidden so as not to be revealed. The danger of the screw and the small shaft is due to its rough surface, which may cause hair and clothing to be wounded, causing injury. In order to avoid this disadvantage, the following measures can be applied to configure the mechanism to be inaccessible when it is started. If possible, try to replace the lead screw and the small shaft with other equipment. Protect the lead screw and small shaft. In the machine tool, in order to prevent damage to various parts of the individual parts and the tool, there should be safety equipment. Because the scattering of fragments is enough to harm workers when the machine is damaged, the safety device is of great significance in safety technology. The safety device has a scissor pin electric break switch and a friction coupling mounted on the kinematic chain of the transmission mechanism. When changing the shear pin, the shear strength must be calculated carefully. If the selected pin is incorrect, it may be under dangerous stress and the insurance pin may not be cut off. The strength of the pin is measured by the maximum torque, that is, the allowable strength of the weaker one of the mechanisms in which the pin is attached. The shear force of the pin is the diameter of the shaft in the formula. The appropriate radius of the pin to be cut can be determined by the following formula to determine the shear strength limit of the material used in the pin made in this formula. A more complete safety device is a friction clutch that adjusts the allowable stress. If the specified stress is exceeded, the friction clutch can interrupt the kinematic chain, and the motion mechanism of the machine tool stops. If the shearing force or the feeding force reaches the allowable stress of the fuse mechanism, the friction clutch automatically starts working immediately. Therefore, the friction clutch does not have to stop the machine after each time the load is exceeded, which is a great advantage.
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