03-20-2018, 04:36 PM
We're testing the new parts on our Structural Edge Tester and they seem to work just fine. These are the "raw parts" we pulled out of the batch prior to powder coating the ones we intend to send out to our volunteer testers. Here's what the current version looks like:
We decided to gather a little data while we were testing new parts so it was back to our Henkel Chef's knife and our standard 150 gram load. The Henkel was sharpened to 170 at the beginning of the test. If you recall the test is conducted by lowering a linear bearing onto the knife edge. The bearing is mounted at a fixed 10° angle so that we are assured of not damaging the edge apex and always inducing the edge to roll in a known direction. The bearing is rolled along the knife edge over a 1.5" long section of the edge. Forward and then back equals one cycle, 5 cycles equal one set. Our mission today? Determine how many sets it will require to roll the edge with 150 grams of force until it's maximum roll state has been achieved. Please keep in mind that we have been experimenting with sets/cycles in order to standardize the test. Earlier data has been reported using fewer sets/cycles. We think that 5 sets will now be our standard. We began with one set and the edge rolled from 170 to 390. Then:
(1) additional set - 440
(1) additional set - 490
(1) additional set - 522
(1) additional set - 565
Then we got in a hurry
(2) additional sets - 628
(4) additional sets - 647
(4) additional sets - 655
655 must be very close to the point where the edge stops rolling given the force used (150 grams). 655 represents
a total roll of the edge of 655 - 170 = 485 points.
Quite frankly the whole exercise seemed much like rolling dough except that instead of the dough getting thinner the edge just kept rolling until the depth of the roll and the force used, equalized. Some side notes here: at 440 only a slight glimmer of light was reflected back to our eye when looking at the rolled section of blade edge-on. Still though, quite noticeable. Could not hook a fingernail on the roll though at 440. At 655 the edge roll was very noticeable in reflected light and you could have hung your shirt on a wire hanger from the roll. We don't post many broadside perspective post roll pics and here's why, there's not much visible even with a 485 point roll.
You can get and idea of the roll extent though when looking at the rolled area "edge-on" versus the same perspective just an inch away where the edge was not rolled.
So where to next? Tomorrow we will be receiving a Shun VG10 HRC 60-61 knife for testing. The results of those tests will likely be for in-house use only because the results of high-end testing are supposed to be the province of our member testers. We will begin shipping out structural test stands next week to our testers.
We decided to gather a little data while we were testing new parts so it was back to our Henkel Chef's knife and our standard 150 gram load. The Henkel was sharpened to 170 at the beginning of the test. If you recall the test is conducted by lowering a linear bearing onto the knife edge. The bearing is mounted at a fixed 10° angle so that we are assured of not damaging the edge apex and always inducing the edge to roll in a known direction. The bearing is rolled along the knife edge over a 1.5" long section of the edge. Forward and then back equals one cycle, 5 cycles equal one set. Our mission today? Determine how many sets it will require to roll the edge with 150 grams of force until it's maximum roll state has been achieved. Please keep in mind that we have been experimenting with sets/cycles in order to standardize the test. Earlier data has been reported using fewer sets/cycles. We think that 5 sets will now be our standard. We began with one set and the edge rolled from 170 to 390. Then:
(1) additional set - 440
(1) additional set - 490
(1) additional set - 522
(1) additional set - 565
Then we got in a hurry
(2) additional sets - 628
(4) additional sets - 647
(4) additional sets - 655
655 must be very close to the point where the edge stops rolling given the force used (150 grams). 655 represents
a total roll of the edge of 655 - 170 = 485 points.
Quite frankly the whole exercise seemed much like rolling dough except that instead of the dough getting thinner the edge just kept rolling until the depth of the roll and the force used, equalized. Some side notes here: at 440 only a slight glimmer of light was reflected back to our eye when looking at the rolled section of blade edge-on. Still though, quite noticeable. Could not hook a fingernail on the roll though at 440. At 655 the edge roll was very noticeable in reflected light and you could have hung your shirt on a wire hanger from the roll. We don't post many broadside perspective post roll pics and here's why, there's not much visible even with a 485 point roll.
You can get and idea of the roll extent though when looking at the rolled area "edge-on" versus the same perspective just an inch away where the edge was not rolled.
So where to next? Tomorrow we will be receiving a Shun VG10 HRC 60-61 knife for testing. The results of those tests will likely be for in-house use only because the results of high-end testing are supposed to be the province of our member testers. We will begin shipping out structural test stands next week to our testers.