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How to DIY a Radius Platen - Theory

Discussion in 'Shop Talk' started by Mark Brock, Jan 7, 2018.

  1. Mark Brock

    Mark Brock Professional Craftsman

    I haven't done this yet. But it is pretty cheap to build, and I expect I will be making myself some platens using this theory.

    I'm thinking I'll use standard 1/2 inch square tubing from Home Depot.
    Not sure I will need the side brace tubing, but it's probably a good idea, which means some welding or other creative attaching.

    In theory you should be able to create any radius you like based on the length of the tubing you use.
    Draw and rough grind the radius squarely on your proposed platen first, which should make the actual grinding on the tube jig minimal. Just use it to true up the radius.

    1. Cut out your platen to desired dimensions.
    2. Drill and tap your platen for your grinder mounts.
    3. Draw the radius you want and rough grind it flat on your grinder workrest.
    4. Attach to the jig and clean and refine the radius.
    5. Send to heat treat.
    6. Create wonderful knife bevels with your desired radius.
    This should be pretty darned cheap, and you can make as many as as varied a set of platens as you like.
    Figuring a way to move the pivot on the tube is what allows you to set the radius you like.
    It could be as simple as a pin with squarely drilled holes in the tubing.

    Let me know what you think!

    RP-Jig-1.jpg
     
  2. butch

    butch Professional Craftsman Founding Member

    should work i made my first wood platen using a string to mark the curve then ground it to shape. more a test to see if i liked the way it ground a blade then ordered a 48" er. if i was going to play with different sizes or was looking to sell some it might be worth the build in my shop tho i think i woudl rather build a true big wheel grinder that takes belts
     
  3. Mark Brock

    Mark Brock Professional Craftsman

    If you ever make that big wheel grinder, would you be willing to make two? :)
     
  4. Jim

    Jim Old Curmudgeon Founding Member

    This is sounding like a group buy!
    ;)
     
  5. butch

    butch Professional Craftsman Founding Member

    depends on if the shop i have build the wheel cuts me a deal on a 2 or 3rd wheel ;)
     

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