... groove made by back chipping ==> 铲根并坡口 groove mark ==> 沟痕 groove markings ==> 槽形纹 ...
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A closer inspection of the tool mark shows a series of parallel teeth marks, probably from the use of a plumber's wrench or tongue-and-groove pliers.
放大后的检验,可见一系列平行的齿纹,有可能来自管钳,会其他靠钳齿来抓牢工件并旋转的钳子。
However, the sectional profile of groove and rake Angle are frequently prone to be below the mark even being rejected because of a large spiral Angle.
但若所加工的螺旋角较大,则易出现槽形和前角不符要求,乃至报废。
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