Abstract: A system is disclosed for automatic radial adjustment of a boring tool in a machine tool spindle to accurately size a bore in a workpiece within extremely close tolerances over a wide range of bore sizes.

Abstract: A contouring and threading attachment for use with numerically controlled multi-function machine tools having automatic tool changing capability. The attachment has a spindle-actuated body adapted to detachably engage an adapter collar rigidly fixed to the outer end of the spindle sleeve. The body may be installed and removed by the automatic exchange arm mechanism of the machine tool and be stored in the tool magazine when not in use. A cutting tool on the outboard end of the attachment is movably radially of the spindle axis. The radial movements of the cutting tool are executed automatically through corresponding axial movements of the spindle under the numerical control of the machine tool.

Abstract: A block type cutting tool with insert blades of the throw away type, the block having pockets for mounting the inserts and clamps movable into the pockets for locking the inserts in place. Each insert includes a groove formed centrally thereof and running generally parallel to one of the locating surfaces of the pocket for engaging a tip portion of the associated clamp. The groove is wider than the tip so that locking of the clamp first causes the tip to wedge the insert into the pocket, following which the tip engages the lip of the groove to firmly draw the wedged insert against a locating surface. This arrangement more positively holds the insert against displacement when the tool is withdrawn, provides a perceptible stop indicating the clamp is fully locked, and, in cases where radial insert adjustment is provided, helps to guide the insert to prevent cocking.