Скачать или смотреть Crock Meter

The hand operated Crock meter consists of a rigid flat metallic platform on which the test specimen can be held firmly and a abrading finger which rubs against it under a specified load. The platform is fixed over the base of the equipment and lies in a horizontal plane. The test specimen is held firmly over an abrasive paper, which is pasted on the upper face of the platform with the help of two pins holding it at both ends.

The abrading has a flat circular rubbing face, which is covered with a piece of white abradant fabric during the test. The abradant fabric picks up colour lost by the test specimen during rubbing. It is held over the finger with the help of a spring grip. Motion to the finger is given through a reciprocating arm, which runs on two wheels to minimize friction and to apply a uniform load on the finger. The arm is moved operated crank and connecting link.

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