The shaft of the motor is milled into a flat D-shape. I don't know how to connect with the pulley, and I need to answer.

If the motor shaft is D-shaped, a D-shaped shaft sleeve is usually used to connect the pulley. D-shaped shaft sleeve is a D-shaped annular part, which can be tightly sleeved on the motor shaft, and the pulley is fixed on the shaft sleeve through screws or clamping devices.

The specific steps are as follows:

Choose a suitable D-type shaft sleeve, and choose a suitable size shaft sleeve according to the diameter of the motor shaft and the inner diameter of the D-type shaft sleeve.

Install the D-type shaft on the motor shaft. First, the shaft sleeve can be clamped on the motor shaft, and then the shaft sleeve can be fixed on the motor shaft with screws or clamping devices.

Put the pulley on the D-shaped shaft sleeve and fix the pulley on the shaft sleeve with screws or clamping devices.

Adjust the position of the pulley to ensure that it is suitable for the position and angle of other components.

Test the connection effect to ensure that the pulley can run normally and will not fall off or loosen.

It should be noted that if the diameters between the motor shaft and the pulley are different, it may be necessary to use an adapter sleeve or other adapters to connect them. In addition, special attention should be paid to the positioning and alignment of the shaft sleeve and pulley when connecting to ensure firm connection and smooth operation. If you have no experience, you'd better seek professional help.