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Does magnetism effect sharpening?

Wed Jan 22, 2014 1:22 pm

There are a few discussions here with people wondering if their magnetized knives need fixing, and others responding that they are completely fine.

But what about sharpening? It's not hard for me to imagine that a magnetized knife would hold onto the bits of metal I was trying to remove and interfere with getting a good edge and especially moving to higher grits. Then again, I imagine a lot of things that turn out to be crazy.

Do you see any difference when sharpening a knife that is significantly magnetic?

Thanks,
Mike

Re: Does magnetism effect sharpening?

Wed Jan 22, 2014 7:26 pm

I've founding in general its not much of an issue. Sometimes if I'm not as tidy as I should be using the belt sander it can get a bit messy.

Re: Does magnetism effect sharpening?

Wed Jan 22, 2014 11:42 pm

I've never noticed a magnetized knife interfering with sharpening. I regularly wipe the knife with a dry rag, that might keep the blade clean of shavings, who knows.

Re: Does magnetism effect sharpening?

Thu Jan 23, 2014 5:14 am

I recall a past post about this topic before and I don't think it would affect sharpening a blade.

It may affect polishing a blade though. It is reasonable to suspect a magnetized blade attracting the metal in the swarf. I would think the magnetism may help to keep the swarf close to the knife creating more of a buffer between the stone and blade? It may slow down the speed of the polishing process but may also maintain a finer scratch pattern. This may work under the right circumstances assuming that the viscosity of water is thin enough, and the particles are bouyant enough to make a difference at all.

I don't know if this can be confirmed to any degree, but it certainly gets ya thinking out of the box!

Good observation Mike!

Re: Does magnetism effect sharpening?

Thu Jan 23, 2014 6:57 am

No it won't effect sharpening. even light pressure is enough to push the particles of metal out of the way of the surface being abraded. they are more likely to adhere to the shoulder above and the edge below. The magnetic force is just not great enough to change the outcome of sharpening.

Re: Does magnetism effect sharpening?

Thu Jan 23, 2014 12:47 pm

Thanks guys. I wonder if it's possible to test. BBC has a good point about the force being very small. If there were a strong magnet material that could take some sort of edge, you could sharpen one that was magnetized and one that was not and compare them. Most magnets I've had to shape have not been a lot of fun though.
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