Rega Naiad to Naia: how a no-expense-spared R&D turntable became a £12k reality


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It didn’t have any data on machining aluminium oxide and so decided it would be beneficial for the company to gain experience in producing something to that kind of accuracy – accuracy which, if you were wondering, was plus or minus one micron in machining the hardest material known to man!

Are you sure aluminium oxide (Al₂O₃) is the hardest material known to man? It is only 9 on Moh's hardness scale. A number of borides and carbides, boron and boron nitride are between 9 and just under 10 and, don't forget diamond at 10, plus some forms of diamond believed to be a little over 10.


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