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Thread: Honing a Wedge!

  1. #11
    Mental Support Squad Pithor's Avatar
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    For honing wedges, I often find myself resorting to applying a microbevel, usually setting the bevel at one layer and finishing on two. After some measuring, of course.

    Best regards,

    Pieter

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    Gasman (07-02-2017)

  3. #12
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    The first razor I bought on ebay was a Joseph Rodgers and Sons near wedge. I wanted the Mack the Knife style and that was what got me into straight razors. Of course I have not yet been able to hone the thing to be even remotely shave ready. I think cutting my teeth on a Sheffield wedge was probably a good thing in retrospect because I can set a bevel and hone a hollow grind to shave ready sharpness without too much of a problem. One day I hope to become adept at honing wedges. For now they sit in their coffin boxes.

  4. #13
    Skeptical Member Gasman's Avatar
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    Im working on this one again tonight if i get the time. I think the idea of honing wedges a little at a time is a good idea so i havent touched it sense i started this thread. Will report back when its done.
    It's just Sharpening, right?
    Jerry...

  5. #14
    Senior Member blabbermouth
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    You might find this helpful.

    http://coticule.be/wedges.html

    There is also an excel file download that will help you calculate the layers of tape you'll need to get the correct bevel angle. It also shows how to take the measurements to do the calculation.

    Bob
    Mrchick and Dieseld like this.
    Life is a terminal illness in the end

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    Dieseld (07-08-2017), Matt1222 (07-09-2017), Mrchick (07-08-2017), niftyshaving (07-11-2017), RezDog (07-08-2017)

  7. #15
    Skeptical Member Gasman's Avatar
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    @BobH I DL the program and put in my info but how do you make the program calculate the angle with layers of tape. I even put in my tape thickness. All in MM. Had to use another program to figure that out as all I know is inches. ha.

    Wait!
    I put the numbers in place of the numbers in the list of razors and got it. According to this thing, 18.2 degress without tape. 3 layers puts it at 22.3 degress.
    Guessing I need to make it only 2 layers to get the angle closer to what is right?

    BTW, Thanks for the calculator. I have a chart I use and it looks close to this. But the calculator is nicer.
    Last edited by Gasman; 07-08-2017 at 08:35 PM.
    It's just Sharpening, right?
    Jerry...

  8. #16
    KN4HJP sqzbxr's Avatar
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    Jerry, the spreadsheet from Coticule.be has a few issues, the main being that the formula for calculating the bevel angle is wrong. The correct formula uses arc tangent, not arc sine. I have a modified version with the correct formulae, along with an improvement that eliminates cell errors if the result is zero (blank records, kamisori, etc.). It is set up to use English measurements:

    Bevel Angle Calculator & Honing Log.xlsx
    Last edited by sqzbxr; 07-08-2017 at 10:51 PM.
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  10. #17
    Senior Member Maladroit's Avatar
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    sqzbxr speaks the truth: I analysed the geometry a couple of years ago and decided the best formula was 2 ARCTAN(t/2W) where W is the distance from the contact point of the spine to the edge (through the centre of the blade, not along the surface) and t is the thickness of the spine. If you use the ARCSIN function the results will be about 1% too high

  11. #18
    Skeptical Member Gasman's Avatar
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    I tried that one but wasn't able to change or add numbers to it. It might be beyond my abilities? Downloaded but cant do anything with the program. Some days its tough being a truck driver and not a computer guy.
    Last edited by Gasman; 07-08-2017 at 10:28 PM.
    It's just Sharpening, right?
    Jerry...

  12. #19
    Senior Member blabbermouth
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    Quote Originally Posted by Gasman View Post
    @BobH I DL the program and put in my info but how do you make the program calculate the angle with layers of tape. I even put in my tape thickness. All in MM. Had to use another program to figure that out as all I know is inches. ha.

    Wait!
    I put the numbers in place of the numbers in the list of razors and got it. According to this thing, 18.2 degress without tape. 3 layers puts it at 22.3 degress.
    Guessing I need to make it only 2 layers to get the angle closer to what is right?

    BTW, Thanks for the calculator. I have a chart I use and it looks close to this. But the calculator is nicer.
    Something is way off there. A bevel angle of 17 degrees is about optimal iirc. If you are at 18.2 degrees w/o tape by adding tape you are going the wrong way.

    When you measured blade width did you measure from the top of the spine to the edge or from where the spine contacts the hone to the edge? From where the spine contacts the edge is correct and doing it the other way really changes things.

    Bob
    Life is a terminal illness in the end

  13. #20
    Skeptical Member Gasman's Avatar
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    Just the area of where the hone touches the spine. Not to the back of the spine.
    Spine thickness is .220
    Side of the blade from the fattest part of the spine (part that would touch the hone) to the tip of the edge is .725
    And tape is .007 according to my mic.
    Last edited by Gasman; 07-08-2017 at 10:43 PM.
    It's just Sharpening, right?
    Jerry...

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