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Thread: Making a burnisher

  1. #1
    Join Date
    Mar 2010
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    Making a burnisher

    My Question is, would this carbide drill blank be suitable for making a burnisher?

    The commercial burnishers I have seen use a highly polished carbide rod ,would this rod function in the same way

    regards Brian




    Tungsten Carbide Drill Blank Dowel, 7.9mm diameter 74mm long

  2. #2
    Join Date
    Oct 2008
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    Carterville, Illinois
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    I would think the polished rod would leave a slightly smoother burr, but the drill rod shown will raise a burr. At the price shown, it would be worth a shot. Personally, I don't use a burnisher, and think the burr from the grinding stone is good enough.
    The hurrier I goes, the behinder I gets.

  3. #3
    I gave a solid carbide laminate trim bit to a friend ,for use as a burnisher. He said it worked well and was made better by being polished with diamond compound. What you have is probably same stuff.

  4. #4
    Join Date
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    Quote Originally Posted by Brian Deakin View Post
    My Question is, would this carbide drill blank be suitable for making a burnisher?

    The commercial burnishers I have seen use a highly polished carbide rod ,would this rod function in the same way
    Just curious, are you using this with "traditional" scrapers, negative rake scrapers, or card/hand scrapers (or all three like I do)?

    I've made several and I far prefer a polished rod since any roughness might transfer to the edge and seems like it would be harder to control the pressure. A carbide end mill or router bit mounted upside down in a handle would work. Even a drill bit would work. This one uses a polished carbide rod:

    burnisher_IMG_6767.jpg

    I use another polished carbide but it is a bigger diameter. I like the small diameter better.

    As for the burr I find the grinder burr works but a burnished burr works cuts smoother and lasts a lot longer.

    JKJ

  5. #5
    Hmm... I suppose you could just use the shank of a decent "Cobalt" drill bit.. Most of those are pretty hard HSS.... And most are already polished...

    The thing with that tungsten carbide rod... If it's already hardened and polished - it's probably fine.. But if it's not - yikes.... No thanks... Hand polishing carbide is not my idea of fun...
    Last edited by John C Cox; 03-20-2018 at 10:58 PM.

  6. #6
    The first one I made was from a tiny carbide drill bit, less than 1/8 inch diameter. It worked fine. An old router bit might be better...

    robo hippy

  7. #7
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    I’ve been using an extra fine ceramic slip stone to pull a burr on all my scrapers for 4 years or so - I got it from John Jordan (the other one) when I bought his excellent shear scraper. It works very well and the rounded side pulls a nice burr for scraping. After about 4 burnishes I use the flat side to remove the burr and pull a fresh edge before needing to go to the grinder.
    Before getting the slip stone, I just used the side of an old D-Way 3/8” gouge too short to sharpen to pull a burr. works very well, too. I still use it when I’ve laid my slip stone where it doesn’t belong...
    Last edited by Jeffrey J Smith; 03-21-2018 at 12:07 PM.

  8. #8
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    Quote Originally Posted by Jeffrey J Smith View Post
    I’ve been using an extra fine ceramic slip stone to pull a burr on all my scrapers for 4 years or so - I got it from John Jordan (the other one) when I bought his excellent shear scraper. It works very well and the rounded side pulls a nice burr for scraping. After about 4 burnishes I use the flat side to remove the burr and pull a fresh edge before needing to go to the grinder...
    I should say I do that too, sometimes, using the same slip stone from the same John. (I use his shear scraper too.) What I found is the slip stone easily gives me a fine burr for extremely fine shavings. The burnished burr can be heavier depending on the force I use. I've been using the ceramic stone more on my other scrapers too as well as the insides of 3/8" and larger spindle gouges. I use only the burnisher on the hand/card scrapers I use at the lathe.

    Very nice little stone, recommended. But what's that little groove down the middle of the curved section for, fishhooks or something? I'll ask JJ next time I see him.

    JKJ

  9. #9
    Join Date
    Aug 2007
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    Hampton Roads, Virginia
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    I also use a laminate trim bit and it works very well.
    RD

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