Patent ID: 6086293
Filing Date: 2000-07-11
Classification: B23C,F01B,F02F,Y10T

Abstract:
A cutting tool for machining a valve seat in an engine cylinder head having a work surface and having a plurality of valve seats disposed within said engine cylinder head and each of said plurality of valve seats having a valve seat profile comprising a plurality of valve seat angles relative to said work surface, the cutting tool comprising:a support frame;a spindle having a spindle cavity on a distal end thereof, wherein said spindle is retained within said support frame and is rotatable and translatable along a vertical feed line perpendicular to said work surface;a vertical displacement device for raising and lowering said spindle having a first electrical connection to a system controller;a drive motor for providing rotational force for rotating said spindle having a second electrical connection to said system controller;a machining head disposed at the distal end of and adapted to cooperate with said spindle for providing rotational force to said machining head and a bottom edge substantially parallel to said work surface, the machining head comprising:a taper adapter having a lower portion and an upper portion for mating to said spindle cavity;a carriage head holder having a top, a bottom, and a groove near the bottom, wherein a cavity is formed on the top for accepting said lower portion of said taper adapter;a fixed sleeve having an outside attached to said support frame by a support arm, wherein said fixed sleeve is concentrically disposed around the lower portion of said taper adapter, said fixed sleeve further comprising a thread formed on said outside and disposed within the cavity of said carriage head holder;a pinion feed driving assembly having gears adapted to cooperate with the thread of said fixed sleeve to provide translational movement of said carriage head radially along said cutting radius;a carriage head disposed on the groove of said carriage head holder and adapted to slide along said groove, wherein said carriage head cooperates with said pinion feed driving assembly to vary said cutting radius in proportion to the number of rotations of said spindle;a cutting blade mounted to one of said plurality of mounting holes having at least one edge, wherein said cutting blade rotates concentrically with said spindle;a re-centering means for positioning said cutting blade to a pre-determined position; anda pilot disposed on the bottom edge of said machining head for guiding said machining head;a depth gauge disposed on said support frame having a third electrical connection to said system controller; andwherein said system controller provides control for the vertical translation and rotation of said spindle by performing calculations from input data.