What about the inner diameter of the belt wheel
The general radial is not very good, or there is no place to punch. As a result, it is usually a place to put on the stitching and stitching the screws. These two screws will be able to escape the direction of the keyway, on either side of the symmetrical groove.
The inner hole of the pulley can be enlarged and then fitted with the inner hole of the pulley. The reason is that if you do not extend the inner hole of the pulley, the set will be too thin and the strength will not be enough.
In addition, the set is thick, open keyway on the cover, do not affect the strength of the sleeve. Finish the set, and then tie the screws between the holes of the pulley and the set and prevent the sliding of the set and pulley. The inner hole of the insert is suitable for the shaft of the motor.
