| 摘要 |
PROBLEM TO BE SOLVED: To make a reference seat of not leaving chips on a seat surface even if a workpiece is removed from the reference seat after executing cutting work to the workpiece placed on the reference seat, without requiring labor and cost, with a simple constitution.SOLUTION: A plurality of mutually crossing grooves 4 are formed on a flat reference surface 3z of a seat part 3 of the reference seat 1 for placing the work, and the reference surface 3z is partitioned into a plurality of small areas (a). In this case, a cross-sectional shape of the grooves 4 is formed in any of a V shape, a U shape and a semicircular shape or a combination of these, and a groove width is set to 0.8-1.8 mm, and the depth of the grooves 4 is set to 20-80% of a groove width, and the total area of a flat surface of a top part of the small areas (a) is set to 70-90% of the whole area. |
