Each turntable features two precision-balanced abrading arms. The abrasive arms can be independently lifted (or lowered) to mount or view specimens. Excluding the weight of the wheel, each arm is precisely balanced and will exert a load of 250 grammes upon the specimen. A mount for auxiliary weights is situated outside of the grinding wheel bearing assembly, increasing the load to 500 or 1000 grammes. Weights are guaranteed to be in a position that is concentric with the abrading wheel.

An adjustment for each material’s specific gravity should be done when comparing the wear resistance of materials with various specific gravities in order to provide an accurate assessment of the comparative wear resistance. Divide the wear index result by the specific gravity of the material after computing the wear index as demonstrated above. The application of this adjustment factor yields a wear index corresponding to the material’s volume loss. Test conditions, such as wheel choice and load, must be the same when comparing materials with different specific gravities.

Here is NextGen’s Taber Abrasion Tester wear index calculation formula: Abrasion loss weight/test turnover number x1000.

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