Hole chamfering accessory for drills - has blade clamped into holder and positioned on stem of drill, held in V=notch of holder

摘要

The chamfering accessory allows a bore to be chamfered in the same operation as drilling, without having to change tools or reset the piece. It consists of a blade (7) fixed rigidly in to a slot in a blade holder (1) by screws (13, 14). Another screw (12) prevents the blade becoming dislodge. The blade rests on the stem (6) of the drill and is clamped to the drill by the blade holder which is in two halves, one half having a V-notch and the two halves being clamped round the drill by screws (10, 11). The blade may be orientated to provide either an internal or external chamfer.