How do you check alignment of gearbox with motor?

To check the alignment of a gearbox with a motor, you can use a straightedge or a laser alignment tool. Place the straightedge along the motor and gearbox shafts to ensure they are in a straight line and parallel. Alternatively, a laser alignment tool projects a beam that helps identify misalignment by indicating any gaps. If misalignment is detected, adjustments can be made by repositioning the motor or gearbox as necessary.