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Motorized razor sharpening hone...$11.10

Discussion in 'Sharpening' started by dancom, Sep 16, 2014.

  1. dancom

    dancom Dust Maker Best Shop Tool

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    I got this idea after watching a video for the Razor Sharp Edgemaking system and wanted to try it. Their system uses two paper wheels. I reckoned, why not something like MDF. The hardest part for me would be making a wheel without a lathe handy. I opted for the tried and true table saw with a sled.

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    I started with a chunk of 3/4" medium density fibreboard (MDF). Anything about 10" square will work. I cut this piece down a little as I was planning on making an 8" wheel.

    Drill a hole in the centre to accommodate a wood screw. The screw should fit loosely in the hole

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    Screw the board down to the sled so the blade will 4" from the screw. A 4" radius will make my 8" wheel. I did learn something in geometry!

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    Slide the sled back and forth whilst rotating the board on the screw.

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    Soon a coarse circle is formed.

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    Then with the sled stationary, rotate the wheel until the blade doesn't take any more wood off. We have a fairly true circle now.

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    Drill out the centre hole to match the shaft on my bargain puny garage sale grinder.

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    Voila! Give it a test run. If it's not 100% smooth (and mine wasn't) use a a block of wood and 60 grit sand paper. Hold the block of wood against the bench to act like a tool rest. The sandpaper should only touch the high spots and leave the low spots. My wheel took about 5 minutes of truing.

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    Turn the motor off. Now work some white polishing compound around the wheel.

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    You can apply some more compound as you use it.

    The wheel surface should always be moving off the blade or you risk catching the blade. That could be very bad!


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    It's recommended that you sharpen on the top of the wheel with the surface moving away from you. Keep the blade horizontal and position the blade "down" the circle to get the right angle. See the image I made for this for a better understanding.

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    My beat up chisel was soon shaving sharp! Yes, there's a patch of hair missing from my left arm!

    I can't wait to try it on some knives. Of course this is only for the finest honing. If you've got nicks to deal with, you'll have to get it to a near wire edge first.

    This isn't meant to detract from the real Razor system. Just a DIY experiment.

    Costs:
    Second hand grinder (garage sale) $10
    MDF $1
    Polishing compound $0.10

    Experiment Grand Total: $11.10.

    UPDATE: 2014-09-18
    I sharpened three kitchen knives this this morning.

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    This is the correct position for honing. I am using one hand for clarity, but you should use two hands for safety and stability. I pass from ricasso towards the tip. One side, then flip and do the other. Check for any reflection off the cutting edge. When the reflection is gone. Give it a test.

    [​IMG]
    Scary sharp like brand new Olfa blade!

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    If a razor is for shaving, then this puppy sharpens kitchen knives and chisels like a razor.


    CONCLUSIONS:
    Another DIY first for Canadian Knifemaker! Super fast and inexpensive. A cared for blade can be touched up in only a few passes.

    I would be selling plans if I hadn't just given them away! LOL
     
    Last edited: Sep 18, 2014
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  2. shadman

    shadman Member

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    impressive-love the way you made the wheel
     
  3. Icho-

    Icho- Staff Member

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    That's pretty cool Dan. I bought the kit. I wish I didn't especially after seeing yours. yours looks to be much better quality. The kit had cardboard wheels.
     
  4. Slannesh

    Slannesh Active Member

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    Made one of these myself. Works very well. I CAN get a blade a bit sharper with an hour or so on the Edge pro, but for the 2 minutes this takes to sharpen a blade I'll sacrifice the small difference to save 58 minutes per knife.
     
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  5. Kevin Cox

    Kevin Cox KC knives

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    That's a cool rig Dan . I like the way you made it .
     
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  6. dancom

    dancom Dust Maker Best Shop Tool

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  7. Slannesh

    Slannesh Active Member

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    Now I need a second and third bench grinder ;)
     
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  8. IamIan

    IamIan New Member

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    Made my own today, works great!! Thanks for the idea.
     
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