The ring test typically identifies a fractured wheel, either externally or internally. abrasive wheel test vitrified wheels can pass this test. When lightly tapped with a wooden mallet, particularly at an angle of about 45 degrees to either side of the vertical center line and between 25 and 50 mm from the edge, such wheels will produce a metallic ring. A wheel that is sound and undamaged will produce a distinct metallic tone. If cracked, there will be no audible "ring" and only a dead sound.
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