ADVANCING SYSTEM FOR A ROTARY CUTTING TOOL

摘要

The toolholder is driven by a spindle (6) in the feed direction. A control face (26) works with a transmission pin (28), relative movement between them causing the toolholder to slide in the feed direction. The face is moved by a shaft (25), which is driven by a feed motor in synchronism with the spindle (6), or at a speed whose ratio to that of the spindle is fixed. At least part of the shaft can be guided in the spindle, the face (26) being formed on its outer periphery. The toolholder can consist of a boring bar (32) coupled to the spindle and with a flexible terminal-holder (30) on the outside. The pin can extend radially pin through the boring-bar wall and be pre-loaded against the control face by the free end of the terminal-holder.