graphite
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graphite replied to the topic Blade alignment in the clamp: sweet spot & constant bevel angle/width in the forum Advanced Techniques and Sharpening Strategies 6 years, 3 months ago
I see the logic in that, but my vise measures about 5.75″ vertical from the pivot point on the angle bar to the top of the vise jaws. But either way, I’m scratching my head wondering why the circles I traced out with the guide rod+sharpie on my first cardboard experiment and then transferred that to the workbench where I used the beam compass…[Read more]
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graphite replied to the topic Blade alignment in the clamp: sweet spot & constant bevel angle/width in the forum Advanced Techniques and Sharpening Strategies 6 years, 3 months ago
Clay, how come you used 7″ diameter (rather than 7″ radius)?
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graphite replied to the topic Blade alignment in the clamp: sweet spot & constant bevel angle/width in the forum Advanced Techniques and Sharpening Strategies 6 years, 3 months ago
Hi Clay, you must have been testing something different from what I was thinking. What are we looking at here, and more importantly, what conclusion did you reach?
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graphite replied to the topic Blade alignment in the clamp: sweet spot & constant bevel angle/width in the forum Advanced Techniques and Sharpening Strategies 6 years, 3 months ago
Clay, I did something similar to that before I built the jig. I traced out semi-circles as I held a sharpie in a constant position on the guide rod, and then at various offset, parallel semicircles when I moved the position of the sharpie on the rod. I used a piece of thin cardboard since the fixed length of the guide rods gets in the way if you…[Read more]
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graphite replied to the topic Blade alignment in the clamp: sweet spot & constant bevel angle/width in the forum Advanced Techniques and Sharpening Strategies 6 years, 3 months ago
Clay, yes, the circles on your revised pdf line up (the cutout lines for the vise are too narrow, but that’s just a matter of cutting it bigger).
I think no matter where the pivot is located along the angle bar, it’s always bisecting the center of the vise, and it’s still tracing out circles in the plane of the blade’s edge no matter the location…[Read more]
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graphite replied to the topic Blade alignment in the clamp: sweet spot & constant bevel angle/width in the forum Advanced Techniques and Sharpening Strategies 6 years, 3 months ago
No they’re circular (drawn with a compass using a common center point, so the lines had no choice but to be circular).
If you think about it, 7″ radius = 14″ diameter, so if you extend my smallest 7″ radius circle about 1″ on both sides of the white panel you can see that it would reach a semi-circle if it had been 14″ wide. In the printed…[Read more]
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graphite replied to the topic Blade alignment in the clamp: sweet spot & constant bevel angle/width in the forum Advanced Techniques and Sharpening Strategies 6 years, 3 months ago
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graphite replied to the topic Blade alignment in the clamp: sweet spot & constant bevel angle/width in the forum Advanced Techniques and Sharpening Strategies 6 years, 3 months ago
Smallest is 7.0″ and largest is 10.5″
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graphite replied to the topic Blade alignment in the clamp: sweet spot & constant bevel angle/width in the forum Advanced Techniques and Sharpening Strategies 6 years, 3 months ago
What would be the best way to test this out? I’m open to suggestions on whether people will need to see microscope measurements of bevels to believe it works, or whether just naked-eye will be good enough, or something else. Most of my expendable knives (the KitchenAid knife set) are starting with uneven bevels so they’ll be hard to judge unless I…[Read more]
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graphite replied to the topic Blade alignment in the clamp: sweet spot & constant bevel angle/width in the forum Advanced Techniques and Sharpening Strategies 6 years, 3 months ago
Here are a few photos of the circle contour jig in use. First is a Wusthof chef’s knife. The black line demarcation between the relatively straight and curves parts is hard to see but it’s roughly in the “5” box of the alignment grid. This knife aligned well with the circular contours, even going beyond the black mark:
Next is a KitchenAid…[Read more]
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graphite replied to the topic Blade alignment in the clamp: sweet spot & constant bevel angle/width in the forum Advanced Techniques and Sharpening Strategies 6 years, 3 months ago
Hi Doug, if you are asking if I have a digital file of the dimensions and cutouts, no, I just used scrap wood and winged it. The main piece of whiteboard is about 12″ wide and 13″ tall (but you could certainly make it smaller, or larger, if you wanted).
I used a sliding miter saw to cut the basic rectangular shape and also to cut most of the…[Read more]
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graphite replied to the topic Blade alignment in the clamp: sweet spot & constant bevel angle/width in the forum Advanced Techniques and Sharpening Strategies 6 years, 3 months ago
Thanks Organic, and before a couple days ago, I had never put much thought into the theory aspect of it either. But once I put a few different knives in the clamp with this circle contour jig in place, and tried to figure out how to use the jig, it occurred to me that if the assumptions about straight edges also hold for “nearly straight”…[Read more]
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graphite started the topic Blade alignment in the clamp: sweet spot & constant bevel angle/width in the forum Basic Techniques and Sharpening Strategies 6 years, 3 months ago
In previous threads there have been in-depth discussions which conclude that—for a straight-edged blade—the straight edge can be oriented at any angle in the clamp jaws and the sharpening stones would still grind a constant bevel angle. In other words, this straight blade edge does not have to be parallel to the clamp jaws; it can be angled rel…[Read more]
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graphite replied to the topic What's the most important thing you've learned (about sharpening with the WE?) in the forum Welcome Mat 6 years, 3 months ago
No not yet. I’ll have some questions to be sure I’m applying its use correctly (I should probably start a separate thread for that, since this thread has its own separate and very useful purpose).
Do you ask because it doesn’t look like it is going to work? I won’t be offended if you see a flaw in it, and in fact it would save me the time in…[Read more]
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graphite replied to the topic What's the most important thing you've learned (about sharpening with the WE?) in the forum Welcome Mat 6 years, 3 months ago
I threw together a “sweet spot finder jig” using 1/8″ whiteboard, and circles drawn with sharpies on the whiteboard using a beam compass. I cut out slots for the handle and tension lever so it can sit right up next to the knife and clamp when clamped. Still need to add a base so it stands on its own. I should also probably buy a clear thin plastic…[Read more]
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graphite replied to the topic What's the most important thing you've learned (about sharpening with the WE?) in the forum Welcome Mat 6 years, 3 months ago
Thanks Organic, but I think I’m going to avoid moving the knife and blending sections, as I’m still ramping up on the basic techniques and getting good edges repeatably, and all the other basic stuff. I’ll live with uneven bevels if that’s what results on certain knives (at least until I master the basics). The moving of the knife was one of my…[Read more]
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graphite replied to the topic What's the most important thing you've learned (about sharpening with the WE?) in the forum Welcome Mat 6 years, 3 months ago
That video with the arcs on the cardboard is really interesting. In the video he places a small range of black tic marks on the stones and sweeps that across the blade edge of the clamped blade in order to judge how close the blade edge comes to conforming to the arc that the stone sweeps.
How wide a range (of the black tic marks on the stones)…[Read more]
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graphite replied to the topic Looking for a new microscope in the forum Sharpener and Accessory Maintenance 6 years, 3 months ago
…and here’s a knife edge using EDOF. This is I think at around 150x magnification, after using Trizact A35 and A20 (I bought some aluminum blanks and cut some self-adhesive Trizact sheets to fit on the WE blanks).
In this case I only needed 2 levels of EDOF to focus the blade edge and body:
And here’s the combined image of the above…[Read more]
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graphite replied to the topic Looking for a new microscope in the forum Sharpener and Accessory Maintenance 6 years, 3 months ago
Mark76: Here’s a photo at 165x of a pencil lead sharpened with a knife (no EDOF, no EDR):
Note that only the highest spot is in focus. And here’s the same still image with EDR:
Next, I did EDOF at 4 focus levels. Here’s the sequence of images with a focus that moves down in depth:
And this is the composite image the dino-lite…[Read more]
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graphite replied to the topic Looking for a new microscope in the forum Sharpener and Accessory Maintenance 6 years, 3 months ago
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