A somewhat unusual condition is shown in Fig. 10, this arrangement having been suggested for the work A in order to rapidly perform the grooving operation deep down in the interior of the casting at V. It was desired to machine this casting complete at one setting. The chuck jaws B were of special form, having a slight angle on the inside of the jaw which drew the casting down onto the three points G. A cast-iron pot E was fastened to the table by screws K, and cored openings J were left at the points where the jaws gripped the work. Midway between the jaws, the pot casting took the form as shown at D and the dogs F were sunk into the edges of the flange by means of the hollow set-screws G. The bar M is a steel casting which bolts against the turret face at its upper end; it is located by the plug L. The operating sleeve T is of tool steel, hardened and ground, and having an angular slot X at its lower end, which bears against the tool V. It is well to make up several of these tools, so that replacements can be quickly made in case of breakage. A steel plate W is let into the casting at this point to form a cover plate for the tool and spring pocket. A teat-screw U fits a slot in the operating sleeve and prevents it from turning.

Fig. 10. A Tool for recessing in a Difficult Position, in Use in a Vertical Turret Lathe.

The left-hand threaded shaft 8 is journaled at its upper end Z and the miter gear 0 is keyed in place. The shaft P carries another gear which meshes with the former, and the entire mechanism is operated by the handwheel Q. (This handwheel in reality is located 45 degrees toward the front of the machine from the position shown). A pointer R assists in making accurate readings from the graduated bevel on the handwheel. Steel thrust collars Y are provided for wear. The tool-steel pintle H is fitted to the center of the table and is held down by the screws shown. This pintle acts as a guide upon which the mechanism is located and greatly assists in making it rigid.