| 摘要 |
PURPOSE:To prevent the breakage of contact members and improve grinding speed by automatically increasing the interval between said contact members by a certain amount while moving a measuring head by a certain amount in the same direction as the feeding direction of a table, at the time of grinding an R part. CONSTITUTION:Contact members 67, 68 are relatively moved to be brought into contact with, and to measure, the peripheral surface of a workpiece W by a measuring head 58. When the workpiece W enters an R-part grinding routine, the contact members 67, 68 are separated by a minute amount from the cylindrical face Wa of the workpiece W due to the separation of upper and lower holding bodies 65, 66, to carry out the cutting of the R part through the movement of a workpiece W table. When the table is fed up to a position where it is brought into contact with the R part, the measuring head 58 is moved in the feeding direction of the table and the R part is cut successively while keeping the contact members clear of the R part. Thereby, the contact members can be prevented from being brought into contact with the R part and broken at the time of grinding the R part, while improving the grinding speed due to movement in the minimum range without being in contact with the R part.
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