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Measuring a Bevel Angle

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  • Measuring a Bevel Angle

    Is there an inexpensive, simple, and empirical way of measuring a bevel angle? It seems in the day of 99 cent laser pens, $10 microcontrollers, and measurements to the width of a neutron that there should be a way to measure the cutting angle of a knife with near accuracy?

    Any ideas or knowledge of a way?

    Thanks in advance.
    Bill
    Living among knives and fire.

    http://www.westernwoodartist.com

  • #2
    For about $15.00 you can buy a digital angle measure.
    Such a thing has been used here in WCI forum threads to measure knife bevel angles.

    A machinist gave me a General brand swing-arm protractor.
    It's a little mech device meant for measuring the tip angles on drill bits for plastics and metals.
    I've measured every wood carivng tool that I've ever bought.
    I use it to see if I'm close when I'm grinding my own tool edges.
    Brian T

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    • #3
      Thanks, Brian and I think that is what I am looking for...will search around and hopefully, Amazon or Harbor Freight will have one. Just couldn't put the words together to search. I understand math and saw many twisted approaches online to use trig but it seemed more complicated than necessary.

      Thanks again!
      Bill
      Living among knives and fire.

      http://www.westernwoodartist.com

      Comment


      • #4
        For what it's worth.....

        I measure all my wood-turning tools with a simple angle protractor:

        https://www.amazon.com/General-Tools...tr%2Caps%2C194


        I have been carving since 1980 and have never, ever, checked the angle of any of the hundreds of tools (chisels, gouges, knives, etc.) I've owned. Not sure why ... ? No need to, I guess. If the angle works for what I do, I leave it along. If not.... I change it 'til it does. ...just sayin'
        Last edited by dave.keele; 07-08-2019, 08:07 AM.
        ....Dave
        Old carvers never die... they just whittle away.
        www.shellknobwoodcarvers.weebly.com

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        • #5
          Thanks Dave, and I'm currently looking at a digital version of your style.
          Bill
          Living among knives and fire.

          http://www.westernwoodartist.com

          Comment


          • #6
            Mathematically, it's quite simple. Measure the distance from the cutting edge to the back of the blade about midway along the blade (assuming it's a single bevel and not one like the Flexcut knives. Use a micrometer or a digital caliper and measure the thickness at the back of the blade at the same place. The formula is

            Angle = 2 x ( ARCTAN ( T/2) / W) where

            T is blade thickness
            W is width of blade

            If you don't have a calculator with TAN and ARCTAN (sometimes labeled TAN-1), you can go here to figure it out https://www.rapidtables.com/calc/mat...alculator.html

            An example: assume the blade is .034 thick at a point 1/4 inch from the cutting edge. T = .034, W = .25
            T/2 / W is .017/.25 or .068 Go to the Calculator link and put .068 into it, click Calculate, and you'll see the angle of 3.89 degrees. This is half the included angle for the blade, so multiply by 2 to get the full angle of 7.78 degrees

            Claude
            My FaceBook Page: https://www.facebook.com/ClaudesWoodCarving/

            My Pinterest Page: https://www.pinterest.com/cfreaner/

            My ETSY Shop: https://www.etsy.com/shop/ClaudesWoodcarving

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            • #7
              Thanks Claude, and just wanted an easy empirical way of doing it, although I do understand, and have a good calculator...however I'm lacking a micrometer/digital. However, I can buy one of those though and would opt for the digital version. Still thinking things over for simplicity as I get older and simpler myself.
              Bill
              Living among knives and fire.

              http://www.westernwoodartist.com

              Comment


              • #8
                Harbor Freight and Lowes both have a digital caliper for $19.99...

                Claude
                My FaceBook Page: https://www.facebook.com/ClaudesWoodCarving/

                My Pinterest Page: https://www.pinterest.com/cfreaner/

                My ETSY Shop: https://www.etsy.com/shop/ClaudesWoodcarving

                Comment


                • #9
                  Thanks Claude, and we live in a remote area so Amazon is usually the answer. I've been looking at this: https://smile.amazon.com/dp/B000GSLK...=ATVPDKIKX0DER

                  Any comments?
                  Bill
                  Living among knives and fire.

                  http://www.westernwoodartist.com

                  Comment


                  • #10
                    Woodburner, that insrument can measure lengths but it cannot measure bevel angles in degrees.
                    See if you can find a "digital protractor."
                    Brian T

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                    • #11
                      Thanks Brian and will look further...
                      Bill
                      Living among knives and fire.

                      http://www.westernwoodartist.com

                      Comment


                      • #12
                        Brian, to use Claude's technique, which I like, I just need a digital "micrometer...yours requires the "digital protractor" which I already have in my cart from last night: https://smile.amazon.com/dp/B00563TM...=ATVPDKIKX0DER

                        That is what you suggested, Brian?
                        Bill
                        Living among knives and fire.

                        http://www.westernwoodartist.com

                        Comment


                        • #13
                          HOORAY! Yes, the digital angle finder/digital protractor. You'll find it works for kitchen knives and drill bits!
                          Brian T

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                          • #14
                            image_16972.jpg This is what I use. Easy peasy.
                            Terry

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                            • #15
                              Thanks Terry and that is what I'll go with.
                              Bill
                              Living among knives and fire.

                              http://www.westernwoodartist.com

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