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Grinder Idea

Discussion in 'Grinders' started by Blackbear74, Feb 23, 2018.

  1. Blackbear74

    Blackbear74 New Member

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    Hi guys/gals,

    I'm thinking of building a 2x72 grinder using only 2 wheels - a drive wheel and a driven/tracking wheel. I also want to mount a disc on one of the wheels for a disc sander. I would mount a platen behind the belt between the wheels. I'm thinking of using a 10” serrated contact drive wheel which would also allow for a hollow grind.

    I've got a 4.5hp, 2 speed motor salvaged from a old hot tub pump. I would also use a step pulley system to give further speed control.

    Anybody tried this type of setup? Why are most people using the more traditional 4 wheel setups?
     
  2. Griff

    Griff Active Member

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    My understanding is then you plan to build a design like a Grizzly or Kalamazoo grinder, but with a disc sander attached?

    http://www.grizzly.com/products/Knife-Belt-Sander-Buffer/G1015


    https://www.kalamazooind.com/products/belt-grinders/2fs72-2-belt-grinder/

    2 x 72 is very popular because the belt length allows the parts of the belt that comes into contact with the material being ground a chance to cool down before that section of the belt is used again, also obviously longer belt means more abrasive, longer use/life etc.

    As for the style, 2x72 belts grinders as used by knife makers, the platen and/or contact wheel sit for the most part right at the makers belly, helps you lock in your arms at the waist, hold the knife in a good grip/fixed position and use your hips to move the blade across the belt, hopefully enabling you to pull off a uniform grind. Others here may have other reasons they can add.

    If you change your mind and decide to use the motor on a more traditional knife grinder build, look through our classified section for the grinders built by regular ConnorBC. Alternatively you could check out Dan's blog with grinder plans on it here http://dcknives.blogspot.ca/

    Also there's this place https://www.knifegrinderparts.com/

    And https://oregonblademaker.com/product-category/belt-grinders/

    Of course you'd have to double check the last two for shipping to Canada, and they are only two examples of many popular resources.

    Good Luck!
     
    Last edited: Feb 24, 2018
  3. dancom

    dancom Dust Maker Best Shop Tool

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    I started on this a while ago. A long platen sort of machine.
    [​IMG]

    A bunch of other projects came along since.

    Dan
     
    Blackbear74 likes this.
  4. Blackbear74

    Blackbear74 New Member

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    Thanks Dan for posting that picture. That's exactly what I have in mind. Only I was going to mount a disc sander as well on the drive axle.

    Dan, would you be able to post a picture from the front as well. I'm trying to see your tracking adjustment .

    I was going to use a bigger top wheel to help shorten the spacing between the two wheels. Also I was going to use a serrated big wheel to be able to use it for hollow grinds .

    I'm a total newby when it come to belt grinders & disc sanders. What is the recommended belt speed for most work, and what is the recommended disc rpm? I won't be able to use a VFD, but like I said earlier, I have a 2 speed motor that I'll be using a 3 speed pulley setup to drive it, so I'm trying to figure out the ballpark speeds I need .

    Thanks,

    Shawn
     
  5. Blackbear74

    Blackbear74 New Member

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    Also I would like to be able to fold the arm down if I want to grind on the platen on the horizontal. Your picture just made the lightbulb come on.
     
  6. dancom

    dancom Dust Maker Best Shop Tool

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    With this unit the whole arm can stand up or lay horizontally. The axle runs through the schedule 40 pipe. It was kind of an experiment at the time. It works, but it's pretty complicated. I could post some photos, but I am not overly proud of the prototype. LOL


    Homemade hinge is 1/4" schedule 40 pipe cut in three.

    [​IMG]


    [​IMG]

    Welded to some 2" flat. Put a bolt through and weld in place. Hopefully your welds look better than these. ;-)

    [​IMG]

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    Not pretty, but it tilts.

    [​IMG]
     
    Last edited: Feb 25, 2018
  7. Blackbear74

    Blackbear74 New Member

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    Dan,

    I'm not in any position to critic welds. My welds are all done with an Miller AC stick welder and some are not great.

    Thanks so much for the follow up pictures. Have you used this grinder much? What's your impression of doing it this way over the conventional way?
     
  8. dancom

    dancom Dust Maker Best Shop Tool

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    I haven't used this too much. Maybe a few hours. The motor as you can see is tiny and it's under-powered at 1/2 horse. I have another 1 hp motor, but it's not reversible so I'd have to build a frame and hang the motor underneath to account for the opposite rotation. It was fun, I am certain there are simpler ways of doing this. Derek Melton in the DIY Tools for the Knifemaker and Blacksmith group on Facebook has made a stand-up two wheeler using the 10" Grizzly wheel. His is way much more simple, but doesn't lay down flat.
     

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