How do you check the run out of the shaft?

To check the runout of a shaft, you can use a dial indicator attached to a stable surface near the shaft. Rotate the shaft slowly and observe the dial indicator's readings; any movement from the baseline indicates runout. Measure both the radial and axial runout by positioning the indicator at different points along the shaft. Consistent readings across the shaft indicate good alignment, while significant variations suggest misalignment or wear.