When processing larger taper pedestal, cabinet, and other parts of the body, using the conventional method is more complex, the need to have special tooling equipment. This paper introduces a can on a normal boring (or other tools, such as milling) using a simple and practical adjustable taper boring bar. 
The Arbor works: star wheel rotates, the rotating boring bar together, while retaining pin fixed to the frame, so that the star wheel around its own axis of rotation, and the boring tool moves along the axis of the screw. Boring tool fixed knife - the nuts. Tip movement trajectory and angle equal to the angle between the axis of the arbor and the arbor screw axis. Changing the angle between the axis of the screw and holder can change the size of the cone angle machining hole. Boring tool passes the amount determined by the size of the pitch and the number of teeth of the star wheel screw. ? 
The Arbor except for the aforementioned tapered bore machining, but also for the amount of conventional feed hole machining trimming. Its method is to remove the stopper pin and locking star wheel, so that the star wheel and screw does not rotate in the boring process. Feed when required, toggle the star wheel to adjust the amount of feed, then tighten the screws from the lock continue to walk the knife.