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Belt Sander

Discussion in 'Grinders' started by John Noon, Feb 28, 2016.

  1. John Noon

    John Noon Well-Known Member

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    Found this gem when looking for tang nuts, forgot to save the page info but the original designer sells these beauty's. A double sided belt sander for performing hollow grinds on both sides of the blade at one time.
    [​IMG]
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    http://jmichaelphotography.com/icemandoublegrinder.htm
     
    Last edited: Feb 28, 2016
  2. dancom

    dancom Dust Maker Best Shop Tool

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    I've always wanted to build a rig like this. If only for the challenge of making it.
    I guess you wouldn't want to accidentally stick the blade in the bottom of the wheels or it could end up stabbed in the ceiling (or worse).
     
  3. Grizz Axxemann

    Grizz Axxemann Active Member

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    I saw a Youtube video on one of these. Pretty interesting piece of kit.
     
  4. Yamroll

    Yamroll New Member

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    On the one hand, it seems handy, on the other, I can't see it being worth the time and money if you already have a grinder, unless you're grinding several hollow ground blades at a time. Or just want the engineering/fabrication challenge
     
  5. poppa bear

    poppa bear Member

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    Still would be handy and the challenge would be fun.
     
  6. Hyde_me

    Hyde_me New Member

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    I started one from 2 old 1x30 with one motor wired to run backwards. Never ended up with a proper grinder but I now have a machine to toss blades across the shop! It's an interesting engineering problem that can't be solved by me strapping 2 machines face to face.
     
    Grizz Axxemann likes this.
  7. Grizz Axxemann

    Grizz Axxemann Active Member

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    Reversing one of the machines was the mistake. Once you turn one of the machines to face the other, you'd have the counter-rotation you need.
     
  8. Hyde_me

    Hyde_me New Member

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    Nope, I have both machines facing the same direction, with the motors running opposing directions. One clockwise, one counter. the problem i ran into was being able to adjust the gap between the 2 with any real precision.

    [​IMG]
     
  9. Grizz Axxemann

    Grizz Axxemann Active Member

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    Okay... something isn't making sense here...

    The way I'm picturing this, you want them facing each other in their natural direction of rotation. That way you end up with the same result as your image above.

    I drew this bird's eye view:

    [​IMG]
     
    Last edited: Mar 15, 2016
  10. Icho-

    Icho- Staff Member

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    The wheels have to be as shown in the pic below.

    [​IMG]

    If they are spinning down and you put a blade down into the wheels it will fire it between the wheels and odds are you will have a messed up blank sticking out of you. There is no way you would be able to hold it with your hands. With the wheels both going into the blade and the sparks flying up and both wheels spinning at the same rpm you have a chance. It is a project I have considered but I have too many other things higher up on the list. As Hyde_me said, you have to have a very precise and solid way to adjust the wheels. You want a minimal gap between the wheels and you would have to account for different belt thicknesses. I think these grinders are very neat but I don't think I would have enough use for it unless I was doing production blades. It would still be a very cool project!:)
     
    Last edited: Mar 15, 2016
  11. dancom

    dancom Dust Maker Best Shop Tool

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    Maybe this is crazy, but wouldn't you want one motor driving both wheels? Asynchronous motors slip and change speed depending on their loads. With one motor, both wheels slow to the same speed when the motor slips. I guess I'd want to see identical motors at least.
     
  12. Icho-

    Icho- Staff Member

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    If I was to build this grinder I would definitely use 1 motor. I would think it's easier to match the speeds with gearing rather than having to match motors.
     
  13. Grizz Axxemann

    Grizz Axxemann Active Member

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    That makes sense. So in other words, both motors would have to be reversed if using a 1x30.

    I found this video of one of the big machines in operation:


    Everything I've seen has been a two motor setup. Watch the video above.
     
  14. Icho-

    Icho- Staff Member

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    If I was just trying to rig something up I would consider a 2 motor setup but if I was designing one from scratch I would go with gears or pullies and 1 motor.
     

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