ERU adjustable knife shapener

Fred.Rowe

Fred.Rowe

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May 2, 2004
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What do you say to a handheld adjustable tungsten carbide knife sharpener that can be set to sharpen every thing from a straight razor to an ax?
It is adjustable from 16 degrees inclusive to 40 degrees inclusive or any degree setting in between. This anodized aluminum sharpener is cnc machined with sharpening angles that are 100% accurate. The carbide faces of C2 carbide are 95 Rockwell "A" and are precisely set in the aluminum housing.
This is the perfect sharpener for scandi ground blades with no secondary edge bevel. The carbides can be set so the bevels match the carbide surfaces resulting in a truly sharp scandi grind.



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The ERU was designed to be carried when you go hunting or fishing, trapping or camping, a true field sharpener. It can be set to sharpen most any blade you carry into the field.
The leather sheath/holder was made using Wicket & Craig top grade leather.

The sharpener is made to be used, held in its holder to protect your fingers.

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An example of an edge done with the ERU. This blade is a forged 1084 that I made and carry every day. Its only seen the ERU for a year and a half. If done with good technique this carbide "V" sharpener will keep a great working edge on most all your knives. This is a 24 degree edge with a 28 degree micro bevel. The micro can be seen in the middle of the bottom pic.
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The ERU can be clipped to your belt or is small enough to be carried easily in your pocket.

Its called Edge Renewal Utility or ERU a truly versatile adjustable knife sharpener.
The ERU is 75.00 shipped conus. No export sales at this moment.
Paypal fred.rowe@bethelridgeforge.com

People that grind using the Bubble Jig will find the ERU a great addition to your sharpening. You can come right of the grinder belt with a specific set angle and go right to the ERU set at the same exact angle to strip the wire edge and finish the edge with a perfect micro-bevel.

Regards, Fred
 
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I think you're on to something here. However, I would personally rather see ceramics than carbide. IMO, carbide sharpeners tend to leave a rough edge and remove too much metal. I learned a long time ago that carbide sharpeners weren't for me. I love the edge ceramics put on a blade though(Spyderco Sharpmaker for example). Replace the carbide blades with ceramic and I'd be in for a couple for sure!
 
RWT said:
interesting
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I got started on this a couple of years ago after measuring the angles in the different fixed, ceramic and carbide strip sharpeners. Every one I measured and I think it was most of them, the set angles were 30 to 35 degrees, which is fine for an axe or machete but not close for hunters or fillets or kitchen knives. Straight razors are around 16 degrees so the "V" has to be very acute.
I carried one for a year and found my EDC's never got dull. I knew the sharpening angles of the blades I carried; when they started to lose their edge, I'd pull the ERU out, set the corresponding angle and with a couple of passes the edge was keen again. Once you have the correct angle a blade is easy to maintain.

Fred
 
fatheadhill said:
I think you're on to something here. However, I would personally rather see ceramics than carbide. IMO, carbide sharpeners tend to leave a rough edge and remove too much metal. I learned a long time ago that carbide sharpeners weren't for me. I love the edge ceramics put on a blade though(Spyderco Sharpmaker for example). Replace the carbide blades with ceramic and I'd be in for a couple for sure!
Click to expand...

Thanks for your input. We are looking at diamond coated or possible ceramics for future runs. What you will find with this tool is the fact that the carbides "exactly" match the cutting edge the abrasives don't chew up the leading edge but instead buff the actual edge bevels as it was originally ground.

If the angle of the edge bevel is not known it can be easily ascertained by applying magic marker to the edge, making a couple of passes through the "V" and correcting the setting. Once you know the sharpening angles of your knives, its easy to set the correct one and renew the edge.

Fred
 
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fatheadhill said:
I think you're on to something here. However, I would personally rather see ceramics than carbide. IMO, carbide sharpeners tend to leave a rough edge and remove too much metal. I learned a long time ago that carbide sharpeners weren't for me. I love the edge ceramics put on a blade though(Spyderco Sharpmaker for example). Replace the carbide blades with ceramic and I'd be in for a couple for sure!
Click to expand...
My thoughts exactly
 
SunsetFisherman said:
My thoughts exactly
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I really do need to post some pictures of edges produced with the ERU. This leaves a polished edge with no marking. Its the angles that are being used. Look at it this way: if the blade is being left with a rough edge why would you think it was the geometry of the too and not the material being used to abrade the surface?
Diamond is much harder than carbide which is harder than ceramic; why would ceramic give a "smoother" edge than diamond or tungsten carbide or aluminum oxide or cobalt for that matter. The surface of tungsten carbide is much smoother than the surface of ceramic. Ceramic is porous in comparison. There are different grades of tungsten carbide some taken to a high polish. The reason carbides are held in such low esteem is the years of set angle carbide drag sharpeners that have been tearing the edges off knives for 20 years. That is not what happens here at all. The edge bevels of your knife are being cradled by the carbides and they are sliding along their entire height. What you have been used to is ones with angle 15 degrees wider than the knife you are trying to put an edge on. Think about.

In most all the drag carbide sharpeners I took apart; there was a very narrow contact surface against the blade's edge. Where they lap to make the "V" the pointed edges contact the steel. This makes for the look of chatter marks on a blade. The contact surface on the ERU is 7/64 across the flat and the full surface contacts the blade edge. I rarely strop after using this sharpener the edges are so clean.

Fred
 
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