To sufficiently supply the coolant to a contact surface between a work and a grinding wheel, when a honing head which is provided with the grinding wheel at its periphery is rotated and moved in the axial direction in order to grind the internal surface of a cylinder.
A grinding wheel shoe 13, which can move in the radial direction, is installed in a head main body 5 of a honing head 1, while a groove 63 is formed in a contact surface between a grinding wheel 11, which is situated at the outside of the grinding wheel shoe 13, and a work W, ranging over the entire length of the grinding wheel 11. A coolant CL, which is supplied to an in-head coolant reservoir 63 of the honing head 1, is supplied to the groove 63 via a communicating hole 61 of the grinding wheel shoe 13 and a coolant supply passage 65 of the grinding wheel 11.
KATSU MASAHIKO
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