Comments on: Loose Grit is not always the best choice. http://toolmakingart.com/2008/09/03/loose-grit-is-not-always-the-best-choice/ Timeless Tools Wed, 03 Mar 2010 05:44:32 +0000 http://wordpress.org/?v=2.9.1 hourly 1 By: BobStrawn http://toolmakingart.com/2008/09/03/loose-grit-is-not-always-the-best-choice/comment-page-1/#comment-183 BobStrawn Wed, 03 Sep 2008 19:16:13 +0000 http://toolmakingart.com/?p=296#comment-183 It was the fine grit bedded into wood that really did a good job of eating burr. I don't know that the wood will stay flat and even, but for cleaning the burr off, 0.05 micron aluminum oxide works like a champ. Two scrapes about two feet long, and there is no detectable burr left on the edge of the scraper. I would prepare all eight edges on a scraper, and then get maybe 16 total passes before I had to burnish new edges. Fortunately the cleaning up the edge before burnishing was already done. 16 2' passes at a time, while trying to cleanly remove the grit from the entire surface took a bit of work. I think I probably redid the scraper 20 or so times before the scraper started to keep a burr with any consistency. Then I continued until the scraper burr seemed unaffected by the scraping. The fine dust spread by scraping, so it took a bit. Perhaps waxing or wetting it might have kept from spreading the grit. Bob It was the fine grit bedded into wood that really did a good job of eating burr. I don’t know that the wood will stay flat and even, but for cleaning the burr off, 0.05 micron aluminum oxide works like a champ. Two scrapes about two feet long, and there is no detectable burr left on the edge of the scraper.

I would prepare all eight edges on a scraper, and then get maybe 16 total passes before I had to burnish new edges. Fortunately the cleaning up the edge before burnishing was already done.

16 2′ passes at a time, while trying to cleanly remove the grit from the entire surface took a bit of work. I think I probably redid the scraper 20 or so times before the scraper started to keep a burr with any consistency. Then I continued until the scraper burr seemed unaffected by the scraping. The fine dust spread by scraping, so it took a bit. Perhaps waxing or wetting it might have kept from spreading the grit.

Bob

]]> By: Skip J. http://toolmakingart.com/2008/09/03/loose-grit-is-not-always-the-best-choice/comment-page-1/#comment-182 Skip J. Wed, 03 Sep 2008 18:18:45 +0000 http://toolmakingart.com/?p=296#comment-182 I hear you - I can see where that coarse grit could "clean off" the little thin layer of metal that is the burr on a scraper! Oh well, you make a new tool everyday..... might as well be scraper tools.... Skip I hear you – I can see where that coarse grit could “clean off” the little thin layer of metal that is the burr on a scraper! Oh well, you make a new tool everyday….. might as well be scraper tools….

Skip

]]> By: BobStrawn http://toolmakingart.com/2008/09/03/loose-grit-is-not-always-the-best-choice/comment-page-1/#comment-181 BobStrawn Wed, 03 Sep 2008 17:58:14 +0000 http://toolmakingart.com/?p=296#comment-181 It was rather brave, I do admit. Better, I doubt. Usually I do my experiments on more expendable and smaller sections of wood. This was a fairly time consuming and hard work causing experiment. I had to scrape it clear, having an abrasive built into a work table, is probably a bad thing. I may take a block of wood and treat it with the fine grit, just for cleaning off a burr before sharpening a scraper. It does a really good job. Bob It was rather brave, I do admit. Better, I doubt.

Usually I do my experiments on more expendable and smaller sections of wood. This was a fairly time consuming and hard work causing experiment. I had to scrape it clear, having an abrasive built into a work table, is probably a bad thing.

I may take a block of wood and treat it with the fine grit, just for cleaning off a burr before sharpening a scraper. It does a really good job.

Bob

]]> By: Skip J. http://toolmakingart.com/2008/09/03/loose-grit-is-not-always-the-best-choice/comment-page-1/#comment-180 Skip J. Wed, 03 Sep 2008 17:41:39 +0000 http://toolmakingart.com/?p=296#comment-180 You're a better man than me Bob! I'm not sure I'd have shown that one..... Skip You’re a better man than me Bob! I’m not sure I’d have shown that one…..

Skip

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