Boring tool with remote diametral adjustment - has finishing tool bit mounted on tilting beam supported against opposed wedges in central drawbar

摘要

The principle is shown applied to a combined roughing and finishing tool with a roughing toolbit (13, 14) and chamfering toolbit (13`, 14`) set in the tool body (10), and a finishing toolbit (15, 16) clamped to a beam (18) which tilts about the central pivot (20) fixed in the tool body. Spherical ended pins (36, 38) at each end of the tilting beam support it against opposing wedges (28, 30) recessed in the drawbar (34), so that when the drawbar is moved under hydraulic or servo-motor control the beam (18) tilts and causes radial adjustment of the finishing toolbit. The beam is preloaded by adjustment during manufacture of the screw (50). USE/ADVANTAGE - Can be applied to boring tools with several finsihing toolbits around the circumference. Advantageous with tool materials having high initial wear rates. Fine adjustment. Robust wear free mechanism. Unaffected by centrifugal force.