The Quill Stop provides a quick and accurate way to set the quill depth of cut on Grizzly G0619 and G0463 and all Sieg X3 and SX3 mills. ... To setup the chamfer the first time on a part, turn the mill off and simply lower the cutter to the top of the part, lock the fine feed knob, and backoff one full turn (turn the Button Nut clockwise as ...