Mountings for boring tool bits

摘要

A mounting for a pair of boring tool cutting bits, the mounting being such that the two cutting bits, when present, project beyond a forward end of a mounting member and are displaced through 180 DEG relative to each other. Each of the tool cutting bits is mounted on a respective cutting bit carrier which is radially adjustable relative to and guided on teeth on the mounting member. The teeth extend in the direction of adjustment at right angles to the rotary axis of the mounting member and are parallel. The cutting bit carrier is also adjustable radially by means of an adjusting screw engaging the carrier and extending in the direction of the teeth. The teeth of the two cutting bit cariers is provided on the forward face of the mounting member in a common radial plane with continuous teeth running across the whole breadth of the forward face. The cutting bit carriers have similar teeth on their rear ends facing towards the forward face. The clamping screws are arranged parallel to the rotary axis.