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Q&As since 1989


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Particle size distribution of abrasive grains

While preparing abrasive grains, it is general practice to have maximum no. of grains of a particular mesh size, with minimum of oversized and undersized grains. E.g. Grit # 120 must contain at least 50 % grains that would be retained on a # 120 sieve.

This would ensure that the depth of metal removal while working with this grit would be uniform.
On other hand one would think that having few particles of undersized and oversized grains would help in removing finer scratches and speed up polishing respectively.

Why then do the standards like FEPA allow tolerances in grading of abrasive grains ?

Mr. Mahavir Mahedu
synthetic emery grains and powder - Gujrat, India
2003

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You know, when dealing with nature and that which is found in nature, you find that most things are not exactly alike. This is almost like the snowflake theory. Meaning that no two abrasive grains that go through a screen/sieve are exactly alike. All standards are based upon tolerances. Now, knowing that, you may now want to look at some man made uniform abrasive systems that are now beginning to emerge.

AF Kenton
retired business owner - Hatboro, Pennsylvania
2003