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Secondary Bevel On A Convex Ground Blade?

Discussion in 'Working the Steel' started by Griff, May 21, 2017.

  1. Griff

    Griff Active Member

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    Here's where I show just how new I am!

    My next project is a camp/ chopper/ machette hybrid for my brother-in-law to use on his property for a multitude of tasks. Starting with a piece of 2" O1 I am going to flat grind a 1 & 3/4 inch high bevel to near finish, and then convex that to the finish edge thickness before heat treat.

    But when I go to put on the secondary bevel I am at a loss...how do you do this? Basically I'm asking what is a secondary bevel on a convex ground chopper, is it convex again? Or a flat grind micro bevel at 30 degrees (or whatever the suggested angle for this style of blade)?

    Thanks in advance for any help / insight,

    Cheers,

    Griff.
     
  2. dancom

    dancom Dust Maker Best Shop Tool

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    It's pretty hard to do a convex at 15 thousandths. I would do the primary convex to around 0.015" or so then put a 25° (flat) edge from there.
     
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  3. Griff

    Griff Active Member

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    Thanks D, much appreciated!
     
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  4. Griff

    Griff Active Member

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    Another question. I decided to go with a convex grind as I know they are preferred for this type of blade, but as knife makers have any here ever gone with a hollow grind for a camp/chopper?
     
  5. dancom

    dancom Dust Maker Best Shop Tool

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    Me never. I always think of the application when deciding on the grind and a concave grind doesn't really fit the application. In my mind, hollow is more suited for a slicer or a straight razor. One might find the edge is too delicate for hacking into tree trunks with. It would make me cry to hit something hard with a knife I spent hours making, only to find a big chip in the blade because of insufficient mass behind the edge.
     
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