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Thread: Negative Rake Scraper

  1. #1
    Join Date
    Dec 2006
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    Goodland, Kansas
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    Negative Rake Scraper

    I have seen a lot of talk on other forums about negative rake scrapers and I have been thinking about it for a while. So I went to PSI and bought a 3/4" sqaure end scraper. I took and ground it to a combined angle of 42*. It looks like a skew. I had been in contact with Cindy Drozda who has been great in helping. Anyway once I got the shape I wanted and is one she suggested then you only sharpen on one side so you have a burr on the top side. I will say this. I have been working on another lidded box like the finial star. I used it on the inside of the lid and the top side of the lid. I can say it does a great job with thin, wispy ribbons and I actually finish sanded it with just 400 and 600 grit. Anyway the finish on the inside and outside was just smooth like glass. I also wanted it to try and lighten the dye like she does on the background colors. So will continue to try it on different projects to see how it goes.
    Attached Thumbnails Attached Thumbnails Negative Rake Scraper 1.jpg   Negative Rake Scraper 2.jpg  
    Bernie W.

    Retirement: That’s when you return from work one day
    and say, “Hi, Honey, I’m home – forever.”

    To succeed in life, you need three things: a wishbone, a backbone and a funnybone.

  2. #2
    Join Date
    Dec 2006
    Location
    Yorktown, Virginia
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    Bernie, I really like mine, but those burrs only last for a blink.

  3. #3
    Join Date
    Oct 2009
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    Near Gassaway,West Virginia
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    105
    Bernie that is rather unusual grind. I may have to give that a try. I use a negative grind on some of my scrapers but I just use a diamond file and put a 10 or 15°bevel on the top and a regular scraper grind on bottom. I like how mine works, but may give your way a trial. Thanks for posting.

  4. #4
    Join Date
    Dec 2006
    Location
    Goodland, Kansas
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    You are right Ted. They don't last long for sure but boy do they work nice. Fred I used this tonight to work on a chinaberry bowl that was giving me fits. It is kinda like elm. I just couldn't get it smooth with a gouge or shear scraping. So I mounted it up and in 3 passes it was done. I started sanding 220 and 320. Put my first coat of finish on and the inside now is smooth as glass. I am happy with the tool. I know it is not a cure all but it does have it's place in a turning arsenal.
    Bernie W.

    Retirement: That’s when you return from work one day
    and say, “Hi, Honey, I’m home – forever.”

    To succeed in life, you need three things: a wishbone, a backbone and a funnybone.

  5. #5
    Join Date
    Oct 2006
    Location
    Tokyo Japan
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    15,807
    That is great!
    I really think it is all about having the right tool for the job, I know this means that sometimes you end up with a lot of tools, but I'd rather have a special tool to solve the problem then spend the farm on using more and more sandpaper!
    The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
    William Arthur Ward

  6. #6
    Join Date
    Dec 2006
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    Goodland, Kansas
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    Amen Stu.
    Bernie W.

    Retirement: That’s when you return from work one day
    and say, “Hi, Honey, I’m home – forever.”

    To succeed in life, you need three things: a wishbone, a backbone and a funnybone.

  7. #7
    Join Date
    Feb 2008
    Location
    Grand Rapids, MI
    Posts
    383
    Very nice tool! Another thing worth noting is that if it's honed to a mirror edge you don't necessarily need a burr, especially on really dense woods (like exotics). I used a radius-edged skew honed to a "carving tool" edge as a negative rake scraper on a recent project. It worked superbly even without a burr.

    Hutch

  8. #8
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    Jul 2007
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    DSM, IA
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    Bernie thanks for the pics on how your shaped the scraper...Hutch thanks for telling me what to do with my skew that I've never even used!
    A man is rich in proportion to the number of things he can afford to let alone. -Henry David Thoreau
    My Website


  9. #9
    Join Date
    Dec 2006
    Location
    Goodland, Kansas
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    Your welcome Jeff. Hutch I did use a skew for a long time but I just got tired of honing and sharpening my expensive Lacer skew. I think Ken Fitzgerald and I are about the only one's that love skews.
    Bernie W.

    Retirement: That’s when you return from work one day
    and say, “Hi, Honey, I’m home – forever.”

    To succeed in life, you need three things: a wishbone, a backbone and a funnybone.

  10. #10
    Join Date
    Feb 2011
    Location
    Ladner BC
    Posts
    42
    Hey Bernie and all the rest of you really bright guys.

    I understand that this 'negative rake scraper' seems to work really well but I have a lot of difficulty understanding the physics or engineering principalof it.

    In my very small mind it would seem to me that all one does with a scraper is place the cutting edge against a spinning thingy. Again, logically at least to me, the only angle that I can understand is the angle that the edge is place against the spinning thingy.

    So can any of you let me in on the logic that would explain the difference between a regular scraper and a scraper that is sharpened on both sides?

    When I first saw Cindy using a scraper sharpened like this I said to myself, "self me things someone is pulling your leg and trying to get you to buy another toy for your lathe but now with all of you touting the benefits of this tool . . . .

    This is probably a lot like golf. I play, or try to play a little and now I hear that if I want the ball to 'draw' (that is go a little left) I should aim right.
    Likely the same logic, that my muddled brain can't comprehend.

    Pete

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