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I dunno if this is the right place to ask this, but I am building a small belt grinder that will use 2x36" sanding belts. I intend to use it to sharpen chisels, plane irons and knives. It'll be a home built contraption like a wooden harbor freight lookalike. My question is where do I want to go slow and where do I want to go fast? It seems like those that have bigger grinders like 2x72", prefer really fast speeds like 6000 SFM, I assume it's because it hogs of more metal faster and zirconium belts work better at higher speeds unlike AO ones. On the other side there's machines like the sorby pro edge which has a very slow speed like 700 sfm. What gives, why are so many people saying go for speed, but one of the pro sharpening tools on the market goes slow? Is that just because it's for sharpening and doesn't need to remove as much material as other metal shaping operations, or is there more to it? Perhaps finer grit belts work better on slower speeds? At any rate I am building this with step pulleys so I can have a range of speeds. I think 890rpm to 3500rpm is a suitable range.
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Nov 5, 2015 12:44
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| # ¿ Apr 27, 2024 11:41 |
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Right now I am building based on the Bellevue Woodshop plans and modifying them to suit my needs. It'll be a smaller sander. Eventually I'd like to build Johns 2x72 sander, but I am starting off small.
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Nov 5, 2015 20:54
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Uncle Enzo posted:I'd say it depends on your use- sharpening proper you want to go slow, so you don't overheat the metal and ruin the temper. Big belt sanders are also perfect for removing a shitton of material fast, way better than a normal bench grinder. If you're doing shaping or anything where you want to remove material as fast as possible, then yeah a big fast sander with a coarse grit will loving vaporize any material it touches. I've finished this project more or less, turned out completely different than I had planned, but I can use 2" belts ranging from 30" to 39", perhaps more. Making step pulleys so I can have different speeds, so I can use it as a grinder or sharpener. https://forums.somethingawful.com/showthread.php?threadid=2819334&userid=0&perpage=40&pagenumber=308#post457079212
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Mar 10, 2016 09:28
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I really like the way some japanese knives look, with the dark finish on the blade and the bevel being shiny metal. But what is that dark finish? I assume it's just been forged, quenched, tempered and left like that. So some kinda mill scale finish?
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May 28, 2016 06:14
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I'm googling san mai but that's like the inverse of what I meant color wise.
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May 30, 2016 18:35
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Im That One Guy posted:That black coloring is just regular Mill Scale formed during the forging process which was left unpolished. Thanks, this is what I figured, it reminded me so much of mill scale and what blacksmithing objects looks like.
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May 31, 2016 06:31
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| # ¿ Apr 27, 2024 11:41 |
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Well I obviously would, given my line of questioning. Looks awesome.
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May 31, 2016 08:51
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