OldTools Archive
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251255 | Don Schwartz <dks@t...> | 2014‑10‑20 | Re: triangular scraper burnisher was Help identify this tool |
On 10/19/2014 9:56 AM, James Thompson wrote: > ... I still do not see how a burnisher needs to have a sharp edge. I think we all have at least one burnisher, and i have serious doubts that any of them are sharp. But I am open to persuasion. > > Anybody using a sharp edged burnisher? My finest one has fine edges, but those edges are smooth, not sharp. I don't see how a sharp edge could remain sharp when used to burnish steel. Seems to me that the sharp edge would roll over, or break. Here is a link to Diefenbacher Tools' site. They offer three types of burnishers for scrapers - round, oval and (yes) triangular - and give some insight into their use. http://www.diefenbacher.com/accessor.htm#Scraper%20with%20prepared%20ed ges">http://www.diefenbacher.com/accessor.htm#Scraper%20with%20prepared%20edges< /a> You read it there first. I did manage to find the 3-corner blank file I picked up from LV - 2 of them, actually. They were shaped and roughly belt-sanded lengthwise to sharp-ish corners, but are not usable as either a scraper or burnisher as is, so I'm unable to report on testing as burnisher just yet. Made by Blu-Dan of Austria, a maker primarily of files and rasps it seems. Here's a link to their site: http://www.blu- dan.com/abertura.html Blu Dan is a name I haven't noticed before this. Does anyone have experience with the quality of their products? Don |
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251258 | paul womack <pwomack@p...> | 2014‑10‑20 | Re: triangular scraper burnisher was Help identify this tool |
Don Schwartz wrote: > > On 10/19/2014 9:56 AM, James Thompson wrote: >> ... I still do not see how a burnisher needs to have a sharp edge. I think we all have at least one burnisher, and i have serious doubts that any of them are sharp. But I am open to persuasion. >> >> Anybody using a sharp edged burnisher? My finest one has fine edges, but those edges are smooth, not sharp. I don't see how a sharp edge could remain sharp when used to burnish steel. Seems to me that the sharp edge would roll over, or break. > > > Here is a link to Diefenbacher Tools' site. They offer three types of burnishers for scrapers - round, oval and (yes) triangular - and give some insight into their use. > > http://www.diefenbacher.com/accessor.htm#Scraper%20with%20prepared%20 edges">http://www.diefenbacher.com/accessor.htm#Scraper%20with%20prepared%20edge s Given that the most typical error in scraper prep is excess pressure when turning the burr, using a larger burnisher area will automatically decrease the pressure. BugBear |
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251262 | paul womack <pwomack@p...> | 2014‑10‑20 | Re: triangular scraper burnisher was Help identify this tool |
James Thompson wrote: > I may be the only person on the planet who doesn't understand this. I put a lot of effort into sharpening my scrapers, and I use my scrapers a lot. I have always been impressed when I see someone pulling up lovely curls. I have never been able to do that, no matter how much effort I put into edge preparation. I get powder, not curls, well maybe a little curl. I have never been able to use my scrapers in the almost-straight-up position. I have to lean my scrapers forward 15 or 20 degrees. The results from this seem satisfactory. It has not mattered how little or how much pressure I put on my burnisher, or what angle I use. I suppose there is an optimum pressure, and angle, but I haven't found it. I have a chunk of 1 1/2" thick steel with a square side that I use to hold the burnisher square to the scarysharp paper while sharpening. The problem has to be with burnishing. > > I have made burnishers in diameters from 1/8" to 1/2", and I have an oval burnisher I got from Lee Valley. I have never tried a flat burnisher. I'll try that soon. > > But this Hirsch tool does not have a shiny flat surface that I think is required for a burnisher. I have been working on polishing the flats, but the original grind was pretty coarse, and it is quite a chore removing all the scratches. That said, polishing the flats leaves very sharp edges, which do not seem to part of the equation for a scraper burnisher. Obviously when I use the tool as a burnisher the edges will degrade, but I don't see them as useful anyway. They might even dig in. > > So, Galoots.... How do I get the scraper nirvana I see everybody else getting? I must not be holding my mouth right. http://swingleydev.com/archive/get.php?message_id=153998&submit_thread= 1">http://swingleydev.com/archive/get.php?message_id=153998&submit_thread=1 BugBear |
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251686 | Don Schwartz <dks@t...> | 2014‑11‑16 | Re: triangular scraper burnisher was Help identify this tool |
On 10/20/2014 7:51 AM, paul womack wrote: > James Thompson wrote: >> I may be the only person on the planet who doesn't understand this. I >> put a lot of effort into sharpening my scrapers, and I use my >> scrapers a lot. I have always been impressed when I see someone >> pulling up lovely curls. I have never been able to do that, no matter >> how much effort I put into edge preparation. I get powder, not curls, >> well maybe a little curl. I have never been able to use my scrapers >> in the almost-straight-up position. I have to lean my scrapers >> forward 15 or 20 degrees. The results from this seem satisfactory. It >> has not mattered how little or how much pressure I put on my >> burnisher, or what angle I use. I suppose there is an optimum >> pressure, and angle, but I haven't found it. I have a chunk of 1 1/2" >> thick steel with a square side that I use to hold the burnisher >> square to the scarysharp paper while sharpening. The problem has to >> be with burnishing. >> >> I have made burnishers in diameters from 1/8" to 1/2", and I have an >> oval burnisher I got from Lee Valley. I have never tried a flat >> burnisher. I'll try that soon. >> >> But this Hirsch tool does not have a shiny flat surface that I think >> is required for a burnisher. I have been working on polishing the >> flats, but the original grind was pretty coarse, and it is quite a >> chore removing all the scratches. That said, polishing the flats >> leaves very sharp edges, which do not seem to part of the equation >> for a scraper burnisher. Obviously when I use the tool as a burnisher >> the edges will degrade, but I don't see them as useful anyway. They >> might even dig in. >> >> So, Galoots.... How do I get the scraper nirvana I see everybody else >> getting? I must not be holding my mouth right. > > http://swingleydev.com/archive/get.php?message_id=153998&submit_threa d=1">http://swingleydev.com/archive/get.php?message_id=153998&submit_thread=1 > > BugBear > I should apologize for coming back to this long after everyone else lost interest. But I was still interested - and busy... So I cleaned up 2 adjacent sides of one of my triangular 'file blanks' using coarse Alox paper on glass to remove the factory grind marks and a diamond stone 325x. Then I put randomly small bevels on the edge where they met using the 1200X side - just enough to eliminate what was left of reflective surface on the edge. I used one the flats to remove what remained of the old hooks on a Sandvik card scraper, lifting the burnisher slightly to avoid having the leading edge contacting the scraper ( ie dragging the trailing microbevelled corner). Did that on both sides and then the scraper edge itself. Finished off by slightly raising the handle of the burnisher while I dragged it along each edge to form new hooks Done very lightly, almost no downward pressure applied. Tested the new edges on a cheese board I'm restoring with Watco. Again, very lightly, no significant downward pressure on the scraper. It took dried nibs of finish off the surface, leaving a light dusting of finish on the scraper. There is little or no evidence of scraping on the cheeseboard, and I am ready to apply more coats. For my money, this is easier and better than sanding between coats. The scraper has a better edge than I'm able to produce with a rounded or oval burnisher for this application - ie cleaning up a finish.. So my final word on this topic is, Yes, a sharp-edged triangular tool can burnish a hook on a card scraper. I can't say if it would produce large hooks to take heavy cuts, but it sure works for the small hoooks needed to take fine cuts. Try it! Don |
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251689 | Bill Ghio <bghio@m...> | 2014‑11‑16 | Re: triangular scraper burnisher was Help identify this tool |
I struggled for years to get a scraper to cut. It was hit and miss and I could never figure out what I was doing wrong. Then I discovered the method shown in this video and have been getting great edges ever since. The key is very light pressure with the burnisher and not too much hook. http://www.finewoodworking.com/tool-guide/video/how-to-sharpen-a-card- scraper.aspx">http://www.finewoodworking.com/tool-guide/video/how-to-sharpen-a -card-scraper.aspx Bill Sent from my iPad > On Nov 15, 2014, at 7:26 PM, Don Schwartz |
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