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The Newbies Arena Are you new to knife making? Here is all the help you will need.

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  #1  
Old 11-13-2012, 11:22 PM
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May try this next any advice?

Scratched this out at work. 11'' X 2'' X 1/4 thick

Last edited by JawJacker; 12-03-2012 at 08:25 PM.
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Old 11-13-2012, 11:30 PM
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Eli Jensen Eli Jensen is offline
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1/4" thick, 1/3 flat grind. definintely a chopper
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  #3  
Old 11-14-2012, 06:59 AM
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The profile of the blade is definately my cup of tea. I've been dying to try a large knife myself, but I do most of the beveling by hand, and I feel like I would just be frustrating myself attempting to remove that much metal. A dedicated chopping blade is fine, but realize that might be all it does well. You could use 3/16" and/or bring the grind closer to the spine and it would slice better while still being a good chopping blade. Or if you're going full chopper you might tweek your design a little to add more weight to the tip end of the blade. Those are just my opinions though. It's a cool design. I say go for it.
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Old 11-14-2012, 11:30 AM
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If you plan on having secondary edge bevels then you might want to consider thinner stock, and/or raising the grind line closer to the spine. At that thickness it will be a pretty wide angle on the edge bevels. If you were going for a single bevel, with no secondary edge bevel then that would help you keep the grind closer to the edge like you have it.

Personally on 1/4" thick, 2" wide, flat ground...I take the bevels 3/4 back, or even to the spine. Short of gross abuse (chopping steel, cement, hammering the blade in material and aggressively torquing it out sideways, etc) it still ends up plenty strong enough.


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Old 11-14-2012, 01:09 PM
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ABUE, Single bevel, that might be the ticket.
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Old 11-14-2012, 04:51 PM
Doug Lester Doug Lester is offline
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With a single bevel it's the angle and not how far back it goes. I would do about 20? for general use and about 25? for a chopper. You could try Fred Rowe's bubble jig as a guide if you are grinding with a belt grinder. You could also get a little gauge that's a little brass disc with angled slots cut into them to guide you as you work if you are using a file. I found one on Amazon for about $10. You might be able to adapt a bubble jig for file work but the more I thought about it the more probems came to mind.

Knifes like that are said to have a scandi grind. To sharpen them, once the edge is established, the bevel is laid flat on the stone.

Doug


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Last edited by Doug Lester; 11-14-2012 at 05:05 PM.
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Old 11-15-2012, 07:34 AM
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This is probably obvious to most people, but it took me a while to get it engrained in my mind. For some reason the relationship between bevel angle, blade thickness, and grind height confused me. The same angle will create a higher flat grind on a thicker piece of steel. Say you cut that same profile from 1/4" and 1/8" and ground both of them half way up the width of the blade. The 1/8" thick one would have a much sharper, more acute angle than the 1/4". Again, this is probably obvious, but it's one of those little things that took a while to click with me. In the end I ended up drawing cross sections on paper so that I could visualize it.
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Old 11-15-2012, 12:53 PM
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Using an angle calculator can help. On a scandi or chisel grind you can input the values and find out how high your bevel will end up.

Heres one I use http://ostermiller.org/calc/triangle.html

Inputting a 25degree scandi grind with 1/4" thick steel the bevel will end up right about 9/16"" tall.


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Old 11-16-2012, 10:24 AM
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Thanks for the advice, I haven't decided yet. I like the idea of the single bevel, but I dont like what it looks like on the other side for a bigger blade.
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Old 11-16-2012, 01:51 PM
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I think when they say "single bevel" they mean a scandinavian style grind. That means there is a bevel on both sides, but it goes all the way down to the edge. When you sharpen it you lay the bevel flat on the stone. I think you are thinking of a chisel grind which would be ground only on one side with the other left flat.
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  #11  
Old 11-17-2012, 06:25 PM
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cbsmith, think I'll do flat.
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advice, angle, back, bee, bevel, blade, brass, chisel grind, design, edge, file, flat, flat grind, grinding, hand, jig, knife, material, steel, stone


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