Thanks Mr. Ken for passing Pavol Sandor's videos along. He makes some interesting videos and is obviously attempting to obtain quantifiable test results and understand what is actually going on during sharpening. All he needs is a PT50B to really complement his efforts.
Anyone who has checked out the microscope images and results I have posted to the Exchange will recognize what he is showing in this first video. He then demonstrates how the burr affects paper slicing. It’s really not a bad demonstration of how even a small amount of burr can impact edge performance. I can’t understand a word of what is saying, but as Mr. Ken noted you don’t need to.
https://www.youtube.com/user/pavolko10
This is cool: Here is his edge retention test machine in action. While his test media is pretty consistent in density and size, it is one area the might be improved upon. There is no before/after sharpness test data, but then he is not so much testing specifically for sharpness but rather how well the edge severs his test media with multiple cuts. From my perspective, testing how well a blade continues to be useful is arguably more important than sharpness per se.
That said, when testing multiple blades, initial sharpness data would definitely be beneficial. He tests the same area of the blade, under the same pressure and has a block to prevent the edge from impact when the test is complete. My hat’s off to him for a really impressive effort to quantify edge retention, which no doubt delivers useful, actionable results.
You can start @ 14:00 into the video to see his test apparatus:
https://www.youtube.com/watch?v=bfp80sYH6iw
Anyone who has checked out the microscope images and results I have posted to the Exchange will recognize what he is showing in this first video. He then demonstrates how the burr affects paper slicing. It’s really not a bad demonstration of how even a small amount of burr can impact edge performance. I can’t understand a word of what is saying, but as Mr. Ken noted you don’t need to.
https://www.youtube.com/user/pavolko10
This is cool: Here is his edge retention test machine in action. While his test media is pretty consistent in density and size, it is one area the might be improved upon. There is no before/after sharpness test data, but then he is not so much testing specifically for sharpness but rather how well the edge severs his test media with multiple cuts. From my perspective, testing how well a blade continues to be useful is arguably more important than sharpness per se.
That said, when testing multiple blades, initial sharpness data would definitely be beneficial. He tests the same area of the blade, under the same pressure and has a block to prevent the edge from impact when the test is complete. My hat’s off to him for a really impressive effort to quantify edge retention, which no doubt delivers useful, actionable results.
You can start @ 14:00 into the video to see his test apparatus:
https://www.youtube.com/watch?v=bfp80sYH6iw