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Originally Posted by mdagley
Just guessing but at 44.8Rc I can't imagine S90v working out very well.
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I hadn't noticed the decimal reading (.8).
That makes me wonder if your Dad read the hardness tester scale correctly. I don't remember seeing a tester that reads in tenths of thousandths.
There are usually 2 or or more graduations on a Rockwell tester dial. Could he have read the scale on the dial incorrectly?
Could the preload weight have been dialed in to another rockwell reading rather than Rc?
If the blade is only 45Rc, a file would cut it very easily.