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Hollow Grinding Fixture ( More Than a Jig)

Discussion in 'Shop Talk - BladeSmith Questions and Answers' started by Stacy E. Apelt - Bladesmith, Apr 15, 2012.

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  1. Stacy E. Apelt - Bladesmith

    Stacy E. Apelt - Bladesmith ilmarinen - MODERATOR Moderator Knifemaker / Craftsman / Service Provider

    Aug 20, 2004
    At the Harrisonburg show, Pop's ( James Poplin) had a new device that was on a Bader BIII grinder. It was a hollow grinding fixture. The simplest way to say it is, "This compares to most hollow grinding jigs the same way a MAPP arm compares to a work rest". The wide work plate keeps the blade in a straight plane as you grind. I think this has potential.

    The device mounts on the work arm, and the work plate flips up over the contact wheel. The blade is held against an upper stop that you adjust to set the hight of the hollow grind. The depth of the hollow is adjusted by setting the height of the work plate in reference to the wheel. Give him a call for more details.

    I attached some photos of it from different angles.

    He says that a flat grinding work plate version is in the design stages.
     

    Attached Files:

  2. jawilder

    jawilder

    Jun 27, 2006
    That looks very promising but the blade also looks like it would be hard to hold. I guess you would use a push stick for the spine? It also looks fairly simple to build. I like the idea.
     
  3. Gody

    Gody

    351
    Jul 20, 2011
    I canĀ“t really figure out how you adjust the height of the grind (the bevels). Can the tool arm be moved in and out to accomplish this?
    Other than that it seems very interesting.

    Brian
     
  4. Salem Straub

    Salem Straub KnifeMaker / Craftsman / Service Provider Knifemaker / Craftsman / Service Provider

    Oct 20, 2008
    Not that I care much about grinding jigs, but did you try it or see a demo? It looks like a good idea in theory, the kind that you have try for yourself to really see if it works. My thought was the same as Jason's, seems like holding the blade could be awkward.
     
  5. Greg Obach

    Greg Obach

    497
    Apr 16, 2003
    i seen something similar by an absmaster smith...but for the flat platen ... i thought it was a sweet idea !
     
  6. lazlo

    lazlo

    420
    Nov 23, 2006
    Looks very similar to Steve Culver's clip grinding jig:

    [​IMG]
     
  7. Stacy E. Apelt - Bladesmith

    Stacy E. Apelt - Bladesmith ilmarinen - MODERATOR Moderator Knifemaker / Craftsman / Service Provider

    Aug 20, 2004
    I didn't grind a blade on it, but simulated a grind with the blade shown. The stop is set at the top of the cutout to run the edge along. The platform height is set by the threaded arm. This will raise the platform for a smaller grind, or lower it for a wider and deeper one. Once set up, you just hold the blade by the tang and with a finger or two against the outer side. Sweep the blade along the stop and the grind cuts evenly. As you reach the tip, just rotate the tang down to keep the edge going along the stop. I didn't ask, but I believe it can be used for any contact wheel from 6-14" ( which will also change the grind height and depth).

    The overall use isn't much different than doing it freehand, but the wide platform keeps the blade straight, and the stop keeps the grind from wandering. I guess the biggest advantage is repeatability of the grind. If you were hollow grinding twenty blades, every one should have an identical hollow grind.
     
  8. dsgibbs1

    dsgibbs1

    325
    Nov 1, 2005
    As someone who primarily does hollow grinds, I am intrigued. As a knife buyer I am kinda saddened. While we all like to make a perfect knife. It is often the subtle differences that make a knife more unique. This kinda makes things more industrialized and less personal. This is just my .02, I like it. It will make grinding go much faster and with less thrown blades. Would I try it. Yes. Would I grumble about how much better my grinds would look? You betcha!
     
  9. richc

    richc

    5
    Oct 11, 2012
    where can I get the jig kit right hollow grinding attachment
     
  10. Stacy E. Apelt - Bladesmith

    Stacy E. Apelt - Bladesmith ilmarinen - MODERATOR Moderator Knifemaker / Craftsman / Service Provider

    Aug 20, 2004
    This is a year and a half old thread. Pop's Knife Supply was the person carrying these.
     
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