| 摘要 |
PURPOSE:To grind a cam block so accurately without entailing any drop in a revolving speed or an infeed rate of a grindstone as well as to make improvements in operation efficiency, by separating the grindstone from the cam block for a moment during grinding the cam block. CONSTITUTION:When a cam shaft W is once twisted in grinding operation on a cam block Wa, restoration of this cam shaft W is prevented by a grindstone 1 even if cutting resistance is decreased by an advance of grinding. But, when the grindstone 1 in grinding operation is separated from the cam block Wa for a moment, the camshaft W is restored whereby the cam block returns to its regular phase, and in this state, subsequent grinding takes place, so that a slip in its phase at completion of grinding of the cam block is reduced as much as possible. Thus, since the cam block Wa is grindable without entailing any drop in a revolving speed and a infeed rate of the grindstone, operation efficiency is improved.
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