These heads are designed in two sizes, 60-90. By using the automatic movement of the carriage, they enable precise boring work to be carried out simply, as well as facing surfaces and recessing (e.g., grooves). For the latter tasks, stopping the tool carriage can be controlled by an adjustable position stop, which allows repetitive operations without resetting the dimensions. When in manual control mode for both translation movements, the stop can also be used without reading the vernier. The position of the tool carriage is thus obtained precisely with automatic advance and with manual advance, which allows the tool to be withdrawn when the adjustable stop is reached.

Automatic Boring and Facing Heads have been designed for simplicity of construction and operation, with particular attention paid to maximum rigidity and freedom from backlash in the tool carriage, which is mounted on extra-large slideways. The Automatic Boring and Facing Head basically consists of a solid cylindrical body fitted with an appropriately shaped shank for mounting to the machine tool spindle.

The body incorporates generously proportioned dovetail slides which contain the tool carriage. The tool carriage, which moves radially, may be controlled manually while the machine spindle is stationary. Alternatively, automatic traverse movement may be imparted to the tool carriage while the machine spindle rotates. This operational flexibility allows a wide range of machining operations to be performed without needing special tooling arrangements. Such operations as boring, turning of bosses, facing, surfacing bosses or bores, inner or outer grooving operations such as for circlips, chamfering, etc., are easily handled by this attachment.

The adjustable stops limit the carriage displacements in both directions when manually controlled and in the feed direction during automatic motion. The Automatic Boring and Facing Heads are high-precision attachments equally suitable for delicate and accurate tooling work as well as for quantity production operations. All parts are made of chromium-nickel steel, heat treated and ground, including the thread and the control screw.