双斜边一号砂轮。
Aranoff adds that choosing to finish patterns that can be easily mechanically cut becomes an issue both on jobs a PSP can accomplish, and the driven wheel does not seal the edge.
安诺夫补充道：“选择精加工那些容易被机械切割的图案，已经成为一个重要议题，尤其在喷印服务商能完成的项目和驱动轮不密封的边缘这两个方面。”
SHOULDER: Defect found on rib or outer diameter; a raised edge on rib face caused by grinding wheel; raised surface at either end of outer diameter raceway.
挡肩：外径或挡肩上发现的缺陷；挡肩上由于磨床砂轮所造成的突起；在外径滚道两端的突起。
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