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My 2x72 Belt Grinder

Discussion in 'Grinders' started by Blackbear74, Apr 1, 2018.

  1. Blackbear74

    Blackbear74 New Member

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    https://photos.app.goo.gl/USzUKnE2E7rj9h4i1
    https://photos.app.goo.gl/gP5nvxRYkWhcOJUr2
    https://photos.app.goo.gl/7HwBq9zlXkkR94uJ2

    Thought I would show some pictures of my belt grinder build. Working on the D plate and platen and should have the wheels I ordered from OBM soon. It’s coming together really well. Can’t wait to try it out.

    By the way, only bought 2’ of square tubing and the bearings and shaft. Rest was salvaged out of the scrap metal bin at work. Shame what they throw away.
     
  2. dancom

    dancom Dust Maker Best Shop Tool

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    Hi, That looks pretty solid. I love the scrap metal bin at work too.

    One question about how hard it would be to change put the belt on. Probably will never have to change it I guess.
    I've seen some related designs with step pulley setup. IMHO one pillow block would work just fine on the drive shaft. The radial forces on the shaft are very small and you've shimmed the pillow blocks to align with the motor shaft.

    Keep us posted on how it's coming along.

    Dan
     
  3. Blackbear74

    Blackbear74 New Member

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    Ya it's not going to be easy to change the drive belt. I doubt I'll ever have to do it unless something bad happens. I'll live with it then. The stepped pulley setup is actually 2 different pulleys back to back. I couldn't justify spending $50/pulley for a true stepped pulley.

    I used the two pillow blocks because the drive coupler is a flexible one. I went this way to try to adapt the goofy shaft on the hot tub pump motor I got for free. The shaft is 1/2", no keyway, and threaded on the end. One plus is the motor is 2 speed. So that basically gives me 4 different speeds.

    I'll post more pictures as I go along. It's a fun build. I hope I enjoy making knives as much as making the tools to build them. My son always says, "Dad, you always find a way to build something new."
     
  4. Blackbear74

    Blackbear74 New Member

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    I got it up and running. Having some belt tracking issues. Was planning on using a 30lb gas strut , but the belt wants to run to the inside against the frame. But if I put more force on the belt, it will ride to the high spot and I can make it track properly. How much force is necessary to make it track well? Or is it the design if the tracking arm? I see most tracking arms with a hinge point in the rear have a bent arm design to make the tracking wheel mount to be on the horizontal.

    What has everybody found to work the best?
     
  5. dancom

    dancom Dust Maker Best Shop Tool

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    30 lbs should be enough. If the belt is tracking hard to the frame, then it's most likely your drive wheel needs to be repositioned. The drive wheel shaft needs to be 90° to the belt path.
     

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