No dialing boring head, sizing blocks for standard sizes, shims and spacers with blocks for intermediate sizes, optional pin holes for quick change

摘要

An improved boring head assembly that is designed for being easily and accurately adjusted to different standard sizes of boring diameters so that it can be accomplished by persons without having a great deal of skill; the device consisting of a spindle for insertion into a chuck of a machine, and an adaptor adjustably mountable on the end of the spindle so to be axially offset a particular amount which is accomplished by means of specifically dimensioned blocks interchangeably placed therebetween, the adaptor serving to hold a boring bar which on its end retains a flying cutter.