04-30-2021, 01:19 PM
In the most previous post KG asked the following questions and they are good ones. The questions, in italics, and the answers:
I've watched your videos about the Edge Lab with much interest.
In one of them, the video "Sharpness Testing With Edge Lab" you show sharpness score on ATF with the BESS certified line of the same knife that was used on the slice test media, and these two scores differ a lot, which is expected of course, since the test media is not the same.
How are these two related?
In the case that you are referring to KG, we demonstrate how E LAB can take ordinary sharpness tests (just as a PT50 SERIES tester does) and of course the process is much the same between the two different styles of testers. Then, later in the video, we use the same procedure (push cut) and the SLCF fixture loaded with SLCTM20 Slice Test Media just to demonstrate that it can, as an option, be done. In the video, the Max force reading with the SLC fixture and Slice test media was approximately 5X that of the ATF and TM02 result. With the scene setting out of the way KG, I'll answer the question best I can at this time. There is clearly going to be a relationship here KG but we haven't defined it yet and here's why: In the case of TM02 test media, edge geometry plays somewhere between zero and minimal, role in the measured result of edge sharpness tests. When push cutting through Slice Test Media, we feel that edge geometry has a significant effect on the measured result and that effect is readily apparent when collecting and graphing the push cut data through Slice TM. Yes, if the edge had been sharper, the force required to push cut the Slice TM would have been less just as it would have been less using BESS TM but correctly attributing how much of that force can be assigned to geometry and how much to edge sharpness is a task that still lays before us and our customer contributors. Please keep in mind that Slice TM was designed to be sliced, not push cut so that portion of the video was designed only as an interesting aside to the primary thrust of the tutorial.
How do you interpret the Edge Lab numbers?
Using the simplest denominator - Average Force. The average force is calculated automatically at the conclusion of each test. Edges and blades with superior slicing efficacy require less force to complete a given test than inferior ones.
What do a sharp and a dull knife score on Edge Lab?
As you know KG there is no clear way to define "dull" really but as you may have seen in the "Manual (handheld)" tutorial our "grocery store knife" (BESS 200 apprx.)
required about 130 grams less force to complete the test than the "knife in need of sharpening" I brought from home. The maximum force required during the test also had about that same spread. If this helps - A DE razor blade requires about 70 grams average force to complete a slicing test but even a DE blade has some geometry contribution. If you drill down and look only at the slicing inception (when the edge first penetrates (slices) the test media the number is - guess what- about 50.
Do you have a separate sharpness scale for Edge Lab?
That's going to be a process with BESSU KG. I would expect first we'll develop an informal one and then, hopefully a new BESS Certified scale.
Have you thought of calibrating the Edge Lab to display numbers close to the BESS certified media?
\
Hadn't thought about that but we will and thanks again for the questions KG..
By the way, and speaking to all now, I have posted all of the EDGE LAB video links to the BESS Exchange "Product Videos & Documentation" section.
I've watched your videos about the Edge Lab with much interest.
In one of them, the video "Sharpness Testing With Edge Lab" you show sharpness score on ATF with the BESS certified line of the same knife that was used on the slice test media, and these two scores differ a lot, which is expected of course, since the test media is not the same.
How are these two related?
In the case that you are referring to KG, we demonstrate how E LAB can take ordinary sharpness tests (just as a PT50 SERIES tester does) and of course the process is much the same between the two different styles of testers. Then, later in the video, we use the same procedure (push cut) and the SLCF fixture loaded with SLCTM20 Slice Test Media just to demonstrate that it can, as an option, be done. In the video, the Max force reading with the SLC fixture and Slice test media was approximately 5X that of the ATF and TM02 result. With the scene setting out of the way KG, I'll answer the question best I can at this time. There is clearly going to be a relationship here KG but we haven't defined it yet and here's why: In the case of TM02 test media, edge geometry plays somewhere between zero and minimal, role in the measured result of edge sharpness tests. When push cutting through Slice Test Media, we feel that edge geometry has a significant effect on the measured result and that effect is readily apparent when collecting and graphing the push cut data through Slice TM. Yes, if the edge had been sharper, the force required to push cut the Slice TM would have been less just as it would have been less using BESS TM but correctly attributing how much of that force can be assigned to geometry and how much to edge sharpness is a task that still lays before us and our customer contributors. Please keep in mind that Slice TM was designed to be sliced, not push cut so that portion of the video was designed only as an interesting aside to the primary thrust of the tutorial.
How do you interpret the Edge Lab numbers?
Using the simplest denominator - Average Force. The average force is calculated automatically at the conclusion of each test. Edges and blades with superior slicing efficacy require less force to complete a given test than inferior ones.
What do a sharp and a dull knife score on Edge Lab?
As you know KG there is no clear way to define "dull" really but as you may have seen in the "Manual (handheld)" tutorial our "grocery store knife" (BESS 200 apprx.)
required about 130 grams less force to complete the test than the "knife in need of sharpening" I brought from home. The maximum force required during the test also had about that same spread. If this helps - A DE razor blade requires about 70 grams average force to complete a slicing test but even a DE blade has some geometry contribution. If you drill down and look only at the slicing inception (when the edge first penetrates (slices) the test media the number is - guess what- about 50.
Do you have a separate sharpness scale for Edge Lab?
That's going to be a process with BESSU KG. I would expect first we'll develop an informal one and then, hopefully a new BESS Certified scale.
Have you thought of calibrating the Edge Lab to display numbers close to the BESS certified media?
\
Hadn't thought about that but we will and thanks again for the questions KG..
By the way, and speaking to all now, I have posted all of the EDGE LAB video links to the BESS Exchange "Product Videos & Documentation" section.