1. Rigid Couplings

Rigid coupling methods currently used mainly associated coupling sleeve plus taper pin, and mostly feed on the motor shaft are equipped with flat key. This connection, after a period of time, began to loosen taper pins, gradually increasing keyway side gap and sometimes even lead to taper pin fall, causing parts processing size instability There are two methods to solve:

(1) two and a small conical spring pins substituted pin connection, although this method is not connected to the method of high precision taper pins, but can solve the problem of loose taper pins, spring pin with a certain degree of flexibility, energy Decomposition part flat key withstand torque, and compact structure, the assembly is also very convenient. warp in the maintenance application, the effect is very good, but the assembly should be noted that the size of the spring pins into each other 180 ° assembly requirements, otherwise it will affect the precision machining of parts ???

(2) use a special tapered pin small headband threaded locking nut plus spring washers to prevent loosening tapered pin caused due to the rapid conversion. This method can solve the problem of the tapered pin loose, but also reduce the flat key is subjected torque. Of course, this method due to conical pin head nut, you must ensure that there is a certain rotary coupling space.

2. The flexible coupling

The flexible coupling is CNC machine tool widely used coupling, it can compensate for concentricity and squareness errors caused by the "interference" phenomenon. In the construction permit conditions, most of the CNC machine tool servo feed systems use The flexible coupling structure. But the flexible coupling assembly is difficult to grasp whether the locking sleeve, if insufficient friction cone sets up after opening, it makes a relative slip between the screw shaft torsional head and the motor shaft end , resulting in running CNC machine work, and is showing a gradual change in the size of a regular machined parts (from small to large or large to small), change the value of each is substantially constant. If you adjust the machine fast feed rate, This change will also play a variation amount, then the CNC system does not alarm, because the motor rotation is normal, the feedback encoder is normal. Once the machine this happens, simply by tightening the screws at both ends of the method is not always successful. The solution is to try to lock the coupling of the elastic conical sleeve, tapered sleeve if too loose, you can cut a slit axially tapered sleeve, tighten the screws on both ends of the rear, you can completely eliminate the fault.