Fig. 2 represents two styles of adjustable boring tools used mostly for boring small shallow holes or jig bushings. These tools are capable of fine adjustments but are not suited for any kind of heavy cutting. The upper part of the illustration shows how tool B is used for boring a part of the bushing A, which is held in chuck jaws. The body of the tool-holder H is made of steel and is turned down and tapered at J to fit the tailstock spindle. The adjustable swivel D is pivoted on the shouldered screw E, and is adjusted by the two headless set-screws F and G. The tool B is of round section and fits the end of the swivel, where it is held in place by the two screws C. The end of the tool is bent over for the purpose of clearance. A tool of this kind is very convenient and is easily adjusted for diameters within its capacity. It is not adapted to deep holes, but can be made up in several sizes so that it will handle fairly large work.

The lower part of the illustration shows another tool of somewhat similar construction, which is designed for the same purpose as the other. The body is of steel and the shank T is turned taper to fit the tailstock spindle. The forward portion of the body R is cut out to receive the swivel N, which pivots on the screw 8. The tool M is of round section, bent over at the end, and it is held in place by the two screws 0. One adjusting screw Q is all that is required in this tool, as the coil spring P takes up lost motion and prevents drawing in. This tool is not as rigid as the one previously referred to, but the spring makes adjusting much quicker, as only one screw is needed. A number of tools of this type, and of various sizes, were made for tool-room use in a large automobile factory and were used on the greater part of the jig work.