Method and machine for machining the surface of a valve seat
 A method and machine for machining the surface of a valve seat (3) which is required to have a very accurate alignment with respect to a guide bore of a valve guide (2). In order to be capable of machining the valve seat surface in high roundness while maintaining a high concentricity with the guide bore, a pilot member (4) is moved forward inclinably to catch a guide bore of a valve guide (2) at its front end; the pilot member is further moved forward bendably while following the guide bore; when the pilot member has reached the desired position, the posture of the pilot member in the position is firmly held; and the surface of the valve seat (3) is machined by moving edged tool members (5a) forwardly while rotating the edged tool members (5a) which are arranged coaxially with the pilot member. A machine for practicing the method includes a forwardly and backwardly movable spindle (8), a pilot member (4) bendable at (7) with respect to the spindle, a bearing member (15) for the pilot member provided alignably with respect to the pilot member, an arrangement (17) for holding the bearing member coaxially with the pilot member, and edged tool members (5a) arranged to be rotatable coaxially with the pilot member and movable forwardly and backwardly together with the pilot member. 
Honda Giken Kogyo Kabushiki Kaisha
B Y Y Y Y B B Y B F
B23C Y10T Y10T Y10T Y10T B23Q B23C Y10T B24B F02B
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Susumu Minoru Koji Hideo Shigeru
Yamada Hiroyasu Takahashi Yamashita Yamagishi