Vending machine motor drives resemble the EC form of SKF cylindrical roller bearings, which are reinforced designs that are filled with more heads and larger rollers to increase the load, as opposed to those without E. From the perspective of load, it is more suitable to choose E. Use tens of amperes and volts to connect the soft copper wire in the bearing chamber to pull the solitary and burn some fine copper particles on it for a week, to be even. Depending on the degree of loosening, pull it a few times.

Round nuts are generally fine threaded and are mainly used for shaft end locking and are usually used with check washers. The round nut and the round nut with a stop washer have always been used together, the width of the washer of the check washer is not the same as the width of the round surface of the chamfered side, and then look at the "eight claws" on the check washer has a certain angle, if the chamfered side is facing outward, the "eight claws" will be flattened when the round nut is tightened.

The washer and the round nut are used together, and the washer is installed on the grooved side of the nut when used, and the inner and outer stop ears are bent into the groove after tightening. After the round nut is tightened, the inner and outer ears are wrenched into axial directions, respectively, stuck in the keyway on the shaft and the opening of the round nut, respectively, so that the round nut will not loosen due to the rotation of the shaft.