The problem of the belt wheel with the speed reducer
It is the alignment of the wheel and the shaft, the keyway of the cone and the standard of the cylinder
It's easier to process a belt for yourself. It is not difficult to meet the requirements of using the machine with a high speed shaft cone. Q is in my profile.
This one is simple, too. Because of the taper of the high speed axis, you will also install the pulley, and the inner hole of the pulley will be tapered. The belt wheel is usually straight inside, so the belt wheel needs to be processed by itself. There is also a way to buy from the decelerator, and ask for the shaft of the decelerator not to have a taper, but also to solve the problem.
