sharpining wheel?

I have, and use, a Sharpmaker and I really love it.

But I recently got a belt sander, and it has pretty much replaced the SM for mot of my blades.

Jerry Hossom has a post here somewhere on using the belt sander, and if you follow it you get the same razor sharp edge as the SM in 1/4 the time.
 
IMHO a ceramic disk grinder (probably what that 5 foot disk was) is not good for a knife, because it puts a concave edge on the knife, which IMHO is way too brittle for anything more than light cutting. I would personally love it if someone made a water or oil cooled (water would be nicer) horizontal ceramic wheel at about 12" radius. As for the sharpmaker the trick is.


Hold the knife perfectly vertical, use medium pressure then lighten up as you finish the hone, and don't pull the knife off the ceramic triangles, when you finish at the tip leave teh tip in the middle of the triangle, if you pull through you will round the tip.
 
I doubt that a 5 foot wheel would put much of a concave on a knife edge! I use an 8" wheel on my belt sanders. The edge on the knives I sharpen seem to do very well. There is nothing wrong with concave edges.
 
Nothing can beat the sensitivity of the human touch. Remenber John Henery.. the steel drivin' man. Learn the skill especially for collectables. Would the Samauri uise a wheel? NO.
 
Bill, you can estimate the amount of concavity of edges with 0.5*edge width^2/wheel radius. If you do this for a typical edge width on grinding wheels you will as you guessed get a very small concavity. For example you get about 0.00025" for a 1/16" edge width on an 8" wheel. This small distance is the depth of the hollow.

-Cliff
 
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