08-15-2018, 10:05 PM
(08-14-2018, 08:58 AM)Ken S Wrote: It seems this edge loss problem is not limited to knives only. I just reshaped a turning skew. With no special attention paid to deburring, it showed a BESS reading of 200. After using it to round one billet, the BESS reading had more than doubled to 420. Apparently, there is something in wood which causes edges to deteriorate.
That is a great real-world test Mr. Ken. Excellent use of an edge sharpness tester.
It would interesting to repeat the test. I have no idea how long it takes to turn one billet. It would be interesting to know how quickly the edge dulls. Maybe turn for 1 minute and take some readings, then 2 minutes, etc.
If I was a turner, I would think it wold be cool to know that after one or two or three minutes of turning that I was now working with a 420 edge that started out as 200. I might ponder the value of sharpening to 200 when after only one billet the sharpness reduces to 420. If only one billet is a very small amount of use, why not just sharpen to 420 in the first place?
Again, very cool test Mr. Ken! Real-world, normal use tests are the most instructive of all and we see precious little of it here on the Exchange.