将大头针去掉，沿周长在离边缘1.5cm处缝一周，如图A。
Remove the pins, then stitch all around the perimeter, 1.5cm from the edge, as marked in figure A.
研究了激光光斑直径及离焦量、切割速度、激光功率等工艺参数对齿轮切缝宽度及加工质量的影响。
The effects on kerf width and quality made by laser facula diameter, focal point position, cutting speed, laser power and other technological parameters were studied.
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