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Thread: Sharpening hole saws?

  1. #1
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    Default Sharpening hole saws?

    Anyone do it? I tried searching youtube but the few videos on it were either not very good or selling a very expensive sharpening jig. Filing the face of each tooth couldn't be that tricky, but it seems like mine have also lost their set. Anyone found a good video on it or have any DIY hints?

  2. #2
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    Default Re: Sharpening hole saws?

    It isn't that hard if you have a file the right size. I set mine, vertical, in a spare drill chuck in my bench vise and file away. It is easy to follow the original pitch. I would not recommend using a Dremmel and disk bit for this one!
    Jay

  3. #3
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    Default Re: Sharpening hole saws?

    Pretty much like sharpening a handsaw. I did mine, including setting them, way back - when I had more time than money. Now, such a labor-intensive endeavor makes no sense for my situation. The sharpening shop gets all that business.
    David G
    Harbor Woodworks
    http://www.harborwoodworking.com/boat.html

    "It was a Sunday morning and Goddard gave thanks that there were still places where one could worship in temples not made by human hands." -- L. F. Herreshoff (The Compleat Cruiser)

  4. #4
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    Default

    Quote Originally Posted by ron ll View Post
    Anyone do it? I tried searching youtube but the few videos on it were either not very good or selling a very expensive sharpening jig. Filing the face of each tooth couldn't be that tricky, but it seems like mine have also lost their set. Anyone found a good video on it or have any DIY hints?


    I have moved over to an adjustable hole saw. It requires more care to use but can be sharpened and you don’t get the ‘hole’ stuck in the saw




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  5. #5
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    Default Re: Sharpening hole saws?

    Good hole saws have bi-metal teeth and a file may not do it. The "other" cheaper hole saws are not worth having.
    A separating disc in a small die grinder works pretty well to just "kiss" the face, but you soon run out of set.
    While you have the separating disc out, a few extra clearance cuts for chips to clear, maybe a 1/2" deep at 90 to the blade can be a good thing.

  6. #6
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    Default Re: Sharpening hole saws?

    I have given a few an extra bit of life by using a 30mm ATA disc to take them back to a decent state.You can send them to a sharpening service if the cost is justified.Re-setting might be challenging with bi-metal teeth.

  7. #7
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    Default Re: Sharpening hole saws?

    I've been able to sharpen a few with a 1/8 thick wheel dressed to a Vee edge, but never been able to set one because they've always been hardened. Tri files have never worked for the same reason.

  8. #8
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    Default Re: Sharpening hole saws?

    Quote Originally Posted by Canoeyawl View Post
    Good hole saws have bi-metal teeth and a file may not do it. The "other" cheaper hole saws are not worth having.
    A separating disc in a small die grinder works pretty well to just "kiss" the face, but you soon run out of set.
    While you have the separating disc out, a few extra clearance cuts for chips to clear, maybe a 1/2" deep at 90 to the blade can be a good thing.
    Good point - back when I did my own, they weren't available with bi-metal teeth. Or maybe I was too cheap to buy them.
    David G
    Harbor Woodworks
    http://www.harborwoodworking.com/boat.html

    "It was a Sunday morning and Goddard gave thanks that there were still places where one could worship in temples not made by human hands." -- L. F. Herreshoff (The Compleat Cruiser)

  9. #9
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    Default Re: Sharpening hole saws?

    FWIW...


  10. #10
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    Default Re: Sharpening hole saws?

    "It isn't that hard if you have a file the right size. I set mine, vertical, in a spare drill chuck in my bench vise and file away. It is easy to follow the original pitch." Jay.

    That's how I do it -main thing is to put the bit in a position that makes it "easy" to make consistent strokes. Since I got cheap set of diamond files - which cut really fast - I don't hesitate to sharpen hole saws, my large band saw blade, forstner bits & any larger drill bit. My cheap diamond set is pretty coarse & I keep intending to get a finer DMT set but I always improve the cutting action of whatever I've sharpened with what I've got in. With hole saws & regular bits what do you have to lose? Give it a try.Moe

  11. #11
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    Default Re: Sharpening hole saws?

    I’m a klutz. If I tried to use that adjustable hold cutter pictured above in my drill press I might just as well give all my guitars away.

  12. #12
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    Default Re: Sharpening hole saws?

    For thin ply I have used double sided carpet tape to attach thicker sheet material to the underside of the job. This keeps the drill central. I am sure you could fix a piece to the table of the drill press. For thicker wood I go half way in and then go in from the other side.

    There is a version with a sprung loaded cowl that would add to stability

    https://youtu.be/VpSgKfYASGk

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