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70/30 or 80/20 change to 50/50 ??

Thu Jun 20, 2013 2:02 am

Hi. A question, please.

If a Japanese knife has a convex grind on both sides and has either a 70/30 or 80/20 bevel, can the bevel be changed to a 50/50 bevel without problem? The steel would be a good VG 10, Damascus.

Thanks.

Re: 70/30 or 80/20 change to 50/50 ??

Thu Jun 20, 2013 2:42 am

Yea, no worries assuming the secondary bevel is symmetrical. That said, you might end up removing a few sharpening a worth of metal. If so, best thin behind the edge for max performance as well.

Re: 70/30 or 80/20 change to 50/50 ??

Thu Jun 20, 2013 11:55 am

"Assuming the secondary bevel is symmetrical"?? Well, it rarely is the case.
You will at least have to move the edge to the right and convex the left face somewhat.

Re: 70/30 or 80/20 change to 50/50 ??

Thu Jun 20, 2013 1:13 pm

First, on an asymmetrically ground knife, it's not just the "bevel" that is 70/30 or whatnot. It's the entire blade grind....spine to edge. Simply changing the bevel to 50/50 does nothing to the blade grind where the asymmetry lies.

To answer your question as I believe you meant it:

Depends!

Define "problem", please. :)

On a thin knife (what we'd call a laser) it can be done with fewer (if any) effects felts. How much it affects you depends on how keen you are on noticing any changes.

Best to try it....if you don't like the results, change it back.

Re: 70/30 or 80/20 change to 50/50 ??

Thu Jun 20, 2013 6:12 pm

Can it be changed? Yes. Is it a good idea? As Adam says, it depends.

Think of it as you would doing a wheel alignment on a car. If you are just driving in town at 30 mph -not so critical. If you are driving a sports cars at 180 mph, you bet it's critical. Some folks do even go as far as grinding a 100/0 grind. I'm not one of them.

The simplest approach is to see how asymmetrical the knife itself is and match that asymmetry with a complimentary edge. If you do decide you want to try a 50/50 grind, try it. If the knife cuts straight for you, that's fine. If not go back to the knife's symmetry matching the edge symmetry.

I think I'm just restating what Adam already said :)

---
Ken
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