与四球机测量结果比较，本文测量结果有较高的重复测试精度。
Compared with those obtained on a fall - ball tester, results on the disc-to-disc tester have higher retest precision.
文中采用传统的四球机法，对工投牌高扭矩钻具螺纹脂的摩擦系数进行了测试。
The paper measures the friction coefficient of Gongtou brand thread compounds for high torque drill tool.
采用四球试验机、光学显微镜、XRD、SEM等分析手段进行了测试与表征。
Typical samples were tested and characterized by four-ball tester, optical microscope, XRD and SEM observation.
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