Boring Head Operation [ 2019 Boring Process Complete Guide ]
Pictured is a typical boring head for a milling machine. It has no arbor or boring bars installed. The boring bars are the actual cutters and go in one of the 3 holes pictured on the top and right side. The silver part slides back and forth on a dovetail to change how far off center the boring bar is cutting. That's how you set the side.