Diamond Stones Different???
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I just visually compared a pair of almost new, recently broken-in, 100/200 grit stone pairs against a very old well used pair of 100/200 grit stones. There is very little difference visually in their appearance. If the diamond stones were not mounted in a color distinguishing handles, I could not discern between the 100 grit and the 200 grit both old and new. To me they appear that similar. That is not to say you are wrong.
I can say the scratch patterns, applied to a knife edge, when viewed under magnification should show a discernible difference. The feel should also be different enough from the coarser 100 grit to the finer 200 grit, to feel a difference with very light pressure.
Marc
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Not quite sure I understand what you’re saying. Both handles have about 3 blades use on them. From top to bottom, they look very different. Is that normal?
I will take your advice and try to look closely at the scratch pattern…maybe a side-by-side comparison. Just got my microscope, so I should be able to take a close look. If I’m really lucky, I’ll be able to post a pic.
Yes. One paddle has 100 and 200 and the other has, what looks like 200 and 200.
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Call Wicked Edge’s customer service guy and they’ll get you a new handle, lickadeesplit. If they let you keep the oddball handle, hang on to it. Figure out a rotation where you use all three handles. If you keep rotating the three handles, you’ll extend their life by about half.
After seven years, my original 100/200 platens still work. I had some serious edge damage early on and now I only use the 200, and then only if I know it won’t hit the apex, as when I flatten the edge to remove serious chips and dents.
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Done.
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Well, as would be no surprise to most of you WE users, Kyle is taking care of it. He got my message and pic and said that they do look like different “stones” and is sending me a replacement set, just like that. Now that’s customer service. I’m sure the second set will be correct, so my issue is solved. Thank you for your responses.
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Marc, here’s what I got….the first is the coarse looking stone. They definitely look different to me and when I worked them, the coarser stone did in fact feel coarse, compared to the other.
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NorCalQ – Here’s an added lesson to take away form your photographic observation exercise:
You can see from the photographs that you have apexed the knife edge with your stone work. The bevel right at the knife edge appears ragged and in line with the scratches and groves left from the stones showing me you have a bevel that is uniform from the shoulder to the apex. This is the visual method I use for determining I have reached the apex, (i.e., apexed the edge), with out the need to create a burr and waste the rolled over steel.
With each subsequent finer grits the raggedness will get less and less as the groves are shallower and closer together.
Marc
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Great lesson Marc! I thought that ragged edge meant I was causing damage to the edge by chipping it out. I never considered that the edge was part of the scratch pattern. Thanks!
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I look to have that parallel, consistent, scratch pattern from bevel shoulder to knife edge, from the heel of the knife to the tip of the knife, and on both sides of the knife, before I move onto the next, lower grit.
Marc
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Another lesson to be taken is that the abrasives all leave a pattern of scratches at the apex as well as on the facet of the bevel. You can work the next grit until the visible scratches are gone, but the jagged edge at the apex is likely to still be there. To achieve a higher level of sharpness, you’ll want to replace those scratches with scratches from your current grit. I will take extra strokes after I’ve fully removed the scratches in the bevel faces. For instance, if it takes 25 strokes of my 800 grit stones to replace the scratches from my 600-grit, I’ll then take 25 or 40 additional strokes to further refine the edge.
Put your microscope on its highest magnification to see what is happening to the apex.
Many ( or most) of our forum members may disagree, but I believe that edge-trailing strokes (upward strokes) will leave a more ragged edge than edge-leading (downward) strokes. This is especially true for the lower grits. The steel particles that make up the edge are anchored less securely than steel surrounded on all sides by more steel. If a sharp object (diamond grit particles here) pushes steel toward the edge, it’s more likely that larger chunks along the edge are prone to breakage. I try to always avoid edge-trailing strokes for grits 600 and below. With higher grits, I’ll use scrubbing strokes, but I’ll apply lest pressure on the upstroke. Of course, with film or strops, you are more or less forced into upstrokes, but these have very high grit values and aren’t likely to remove enough steel to damage the edge.
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I like to learn from videos. Its like getting to stare over someone’s shoulder while they sharpen. This is an old one, but there’s a lot of good information shared in it. He doesn’t do everything the way I would do it, but his results are nice.
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