Another way to measure runout is to use a test indicator, capturing the minimum and maximum values read over a 360° revolution of the endmill. Ideally, the runout should be measured at the tip of the endmill, where the cutting action is, but that means measuring on the flutes themselves. Alternatively, the dial indicator can be positioned on the shaft, as close as possible to the flutes, this will give a continuous readout of the runout over a 360° revolution, but could under-estimate the actual runout a bit.