Patent ID: 6257348
Filing Date: 2001-07-10
Classification: G05B,Y10T

Abstract:
A control apparatus for a drilling machine including means for rotating and moving a small diameter drill, said rotating and moving means rotates the small diameter drill and moves the small diameter drill to a work piece, said control apparatus comprising:first control means for controlling said rotating and moving means so that the small diameter drill is rotating at a first rotating speed, and the small diameter drill is moved to the work piece at a first cutting feed speed by a predetermined depth of cut until a position of the small diameter drill inserted into the work piece reaches a first position from a top surface of the work piece;second control means for controlling said rotating and moving means so that the small diameter drill is rotating at a second rotating speed, and the small diameter drill is moved to the work piece at a second cutting feed speed by a predetermined depth of cut until a position of the small diameter drill inserted into the work piece reaches a second position from the first position of the work piece; andthird control means for controlling said rotating and moving means so that the rotating speed of the small diameter drill is reduced to a third rotating speed which is lower than the first and second rotating speeds, and the small diameter drill is moved to the work piece at a third cutting feed speed by a predetermined depth of cut until a position of the small diameter drill inserted into the work piece reaches a third position passing through a bottom surface of the work piece from the second position of the work piece.