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  1. #1
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    Default Card scraper burnisher

    Will this HSS rod be suitable to burnish a card scraper?

    0.5mm-12.5mm 100 150 250mm HSS Steel Round Rod Bar Axis Metal Shaft Metalworking | eBay

    9.5mm round and 150mm long

  2. #2
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    That will do the job, after you have hardened it.

  3. #3
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    I imagine that HSS rod is hard enough - good luck hardening it if it is not!!

    My choice for a burnisher would be a short length of carbide rod, preferably a polished piece. That would be hard enough for any steel. Remember, light strokes.

    Regards from Perth

    Derek
    Visit www.inthewoodshop.com for tutorials on constructing handtools, handtool reviews, and my trials and tribulations with furniture builds.

  4. #4
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    Quote Originally Posted by derekcohen View Post
    I imagine that HSS rod is hard enough - good luck hardening it if it is not!!

    My choice fir a burnisher would be a short length of carbide rod, preferably a polished piece. That would be hard enough for any steel. Remember, light strokes.

    Regards from Perth

    Derek
    What length do you suggest? I tried looking for carbide but could only find 100mm not sure if long enough.

    I saw that carbatec used to sell a veritas one but I couldnt find it anymore

    edit: also what diameter do you suggest?
    Thanks!

  5. #5
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    There’s a trick to using a burnisher to sharpen a scraper.
    Ill try to explain my take on it.
    I had groove put in a Disston burnisher by a student years ago.
    Id never had that problem and it seems he’d just pulled the burnisher along the edge of the scraper whereas I slide the burnisher side ways as well as along.
    i do this to pull the edge over but it also saves a groove being run in your burnisher.
    H.
    Jimcracks for the rich and/or wealthy. (aka GKB '88)

  6. #6
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    OK, I bought a "burnishing" tool at Rockler. At best it could be described as a scalene spherical triangle rod with a handle. The sides of the triangle are wide, medium and acute.

    The theory is the acute yields the most hook or burnish on the card scraper while the wide yields the smallest or least hook. You use the burnisher typically with the same pressure to create the variety of hooks on the scraper. As you drag the burnisher over the scraper edge, the angle between the burnisher and scraper should be about 75.

    In the real world it is possible to live with a slight or small hook and a aggressive or large hook. You can obtain both of these hooks with screwdrivers. A Philips screw driver with a round shaft will produce the aggressive hook and a screwdriver with a square shaft will produce the smaller hook.

    The advantage of the burnisher is a constant pressure produces the different hooks. In the real world, again, as you are doing the sharpening and burnishing you can feel the difference in the hooks. An alternate burnisher is an automotive valve. The stem or shaft is an excellent substitute for a burnisher. The trick is the number of passes over the card scraper to produce the hook. The more passes the larger the hook.
    Rich

    When SWMBO said "I won't cook in metric."
    The metric system died in the US.

  7. #7
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    Is there a reason why you're buying a rod as a burnisher rather than getting one off the shelf?

    burnishers can be had for not much more money than what you're paying for that rod, plus you get a nice comfy handle.

  8. #8
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    Quote Originally Posted by qwertyu View Post
    What length do you suggest? I tried looking for carbide but could only find 100mm not sure if long enough.

    I saw that carbatec used to sell a veritas one but I couldnt find it anymore

    edit: also what diameter do you suggest?
    Thanks!
    100mm is long enough - you only need about 50mm. This is mine. The rod is about 3/16 diameter. Just epoxied into a handle.



    Here is a tutorial I made: http://www.inthewoodshop.com/Woodwor...29Scraper.html

    Regards from Perth

    Derek
    Visit www.inthewoodshop.com for tutorials on constructing handtools, handtool reviews, and my trials and tribulations with furniture builds.

  9. #9
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    19mm is long enough, according to at least one commercial product, and there's another with quite a short rod:

    https://www.timbecon.com.au/mini-car...iABEgJhJ_D_BwE

    Timberline Tool Scraper Burnisher

  10. #10
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    Paul Sellers offers an alternative philosophy here:
    Scraper Burnishers That Work - Paul Sellers' Blog

    I used the shaft of whatever screwdriver was handy (learned from my dad), and that still happens if I don't grab the Veritas burnisher at the same time as I get out my card scraper.

  11. #11
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    The simple rule about a burnisher is that it is harder steel than the scraper. In days of olde, scrapers were made from old saw blades, which could be softer than modern scrapers. Chisels may or may not work as a burnisher. The guess work goes with a dedicated burnisher made with hard steel.

    With carbide, the steel is self-lubricated. With other steels, it is recommended that you add a lubricant to avoid galling the scraper edge. The traditional lubricant was the oil from the surface of one’s nose - use a finger to wipe some off and then onto the surface of the scraper.

    I prefer a burnisher rod of about 2” since the rod also needs to draw out the steel prior to turning the hook. It is difficult to do this with a 3/4” rod.

    Regards from Perth

    Derek
    Visit www.inthewoodshop.com for tutorials on constructing handtools, handtool reviews, and my trials and tribulations with furniture builds.

  12. #12
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    Thanks everyone for the responses - ended up with this:
    K10 Solid Cemented Carbide Tungsten Steel Round Bar Rods L: 10/20cm D: 2-10mm AU | eBay

    5mm round 100mm long. Ill make my own handle for it

    The reason why I didnt an off the shelf one was that I originally wanted the veritas one but couldnt find it. Then I saw others online just using a rod of HSS or carbide and thought I would make my life a bit harder and do that too. Its not much of a saving esp since its something you keep for life but might aswell get a carbide one

  13. #13
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    Quote Originally Posted by rrich View Post
    OK, I bought a "burnishing" tool at Rockler. At best it could be described as a scalene spherical triangle rod with a handle. The sides of the triangle are wide, medium and acute.

    The theory is the acute yields the most hook or burnish on the card scraper while the wide yields the smallest or least hook.
    That's a good theory . It works ! . Ive always used a polished up file as a burnisher. I have a wide rounded polished top edge I did on my Linisher , a great tool for working on this sort of thing . I just used that top corner and left the bottom two polished but without much radius . It was only a few months ago I decided to use same pressure on the tight under side polished corner . It gave a big difference and a much larger hook which I needed for some aggressive work.
    Makes sense , its just pressure up against how malleable the scraper is I suppose. The finer point directs more pressure ?

  14. #14
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    Quote Originally Posted by qwertyu View Post
    Nice one . Your not going to get better than that for a burnisher Id think . As long as the quality is up there with normal quality TC.

    Do you know if the Veritas one was Carbide or something else ?

    I was wondering if the HSS in the link was Drill Rod ?
    Our standard drills are HSS as far as I know , so are bandsaw blades I think .
    Old Hand saws are or were made before before HSS .
    A HSS drill bit wont drill through saw blade . Wouldn't touch it when I tried 30 years ago on an old saw .

  15. #15
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    Quote Originally Posted by tonzeyd View Post
    Is there a reason why you're buying a rod as a burnisher rather than getting one off the shelf?

    burnishers can be had for not much more money than what you're paying for that rod, plus you get a nice comfy handle.
    Not suggesting a rod but rather "A Rod Burnisher". With handle as you suggested.

    The rod, if you look at a cross section has three sides, each side half an oval. Depending upon the radius of the oval it is easy to create three different hooks on the edge of a card scraper. You use the same pressure for each type of hook. What I normally do is put two large hooks using the acute oval edge of the burnishing rod on the same edge of the scraper. These hooks tend to wear the quickest. On the other edge of the card scraper I'll put a medium and slight hook. When you're using the scraper it is all there right in your hands.

    I've been looking for pictures. This one shows the three surfaces if you look at the end of the burnisher.
    POLISHED TRI-BURNISHER

    I found this one in Sydney at 'The Wood Works'
    https://www.thewoodworks.com.au/shop...05k3201-detail

    The huge advantage of the tri oval model is the same downward effort produces consistent hooks.

    I put a bit of sewing machine oil (3 in 1 brand) on the card scraper. Then two or three passes with the burnisher and you have a hook angle. Put the card scraper in a woodworking vise to hold it in place while burnishing.

    A word of warning. While searching I found a few sites that labeled the product as "Not orderable". If you want one and find it stock, order it now and don't wait because it may be gone when you try again.

    The shed (garage) is a mess from lack of use due to knee surgery for about 2 years. I'll look for mine and try to take pictures.
    Rich

    When SWMBO said "I won't cook in metric."
    The metric system died in the US.

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