BLUING / BLUE UP : Process of using blue dye to coat a surface of a master, gauge, or piece of product to check a flat, circular, or tapered surface.
着色检查：使用蓝色染料涂在模具，量规或者产品表面以检查平面、圆面或者锥面的工序。
The pin fits snugly in a reamed tapered hole that is perpendicular to the shaft axis and either radial or tangential to the shaft surface.
该引脚正好符合了扩锥孔的垂直轴的轴线，要么径向或切向轴表面。
Tapered bores for keyed hubs shall have a minimum of 70% transfer of bluing (surface contact) to the taper gage.
键槽轮毂的锥孔应至少有70%的着色（表面接触）转移到锥度计上？
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