Patent ID: 6340325
Filing Date: 2002-01-22
Classification: B24B,Y10T

Abstract:
A method for forming a groove in a pad comprising steps of:placing said pad on a supporting surface with a working surface of the pad in spaced relation opposite to a router bit and to at least one stop member adjacent to said router bit, an outer end portion of said bit projecting towards said pad beyond said stop member, applying a pressure differential to said pad to cause the working surface thereof to move toward said stop member; providing axial movement between said router bit and said pad and rotating said router bit to cause said outer end portion to form an initial recess by cutting into said pad to a depth below its working surface, said recess depth being limited by said pressure differential causing the working surface of said pad to move into contact with said stop member; and providing lateral movement between said rotating router bit and said pad while the working surface of said pad is maintained in contact with said stop member by said pressure differential to cause said rotating bit to cut a groove that extends laterally away from said initial recess and has a depth substantially the same as said recess depth.