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  • Sharpness testing

    This is actual test – cutting thread (Aunt Lynda’s 100% Mercerized cotton #10) on the scales. To get reliable statistic average it takes 21 tests. 1. Make table on paper like this: 10 20 30 40 … 2. Test weight. 3. Put ‘+’ in your table to the row for the tested weight. 4. Repeat 1 to 3 at least 21 times or more 5. on the table filled by ‘+’ count 11th (if you did 21 tests) and mark it as ‘X’. This will be median – one of statistical average, most applicable in this case (same used for average price on housing market). So weight which correspond to median – ‘X’ will be result of sharpness test. Example: Result for Scrap Yard Knives Dumpster Mutt LE – sharpness out of the box: 40 +++++ 50 +++++X+++++ 60 ++++
    Video Rating: 4 / 5

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    7 Responses to “Sharpness testing”

    1. Good way of testing.
      Just wondering, with this test it shows the edge sharpness (obviously), but I wonder if the edge angle affect the result if at all

    2. I accidently remove one post about thread tension – sorry. Tension was pretty same, however I improve base and use spring enforced tension – see my other video. Results did not really changed too much, but at least it answer such questions.

    3. Digital scales too slow, I tried them. I turn to postal scale – see my latest video with latest set up – I use lamp clip to hold thread under pressure. Best what I had 0.5 oz. But it need to be several measurement to have right statistic.

    4. This is really cool. I have an accurate digital scale that I could use. Of course, it’s just for fun and curiosity, since I am very happy with the edges that I can get and maintain. But, still, something to do.

      What is the lightest pressure you were ever able to achieve?

    5. I like your set up. Simple and repeatable test. Makes me curious how some of my knives would do.