Chamfering Edges on Shapton Glass?

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Eli Chaps
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Chamfering Edges on Shapton Glass?

Post by Eli Chaps »

Another pestering question... :D

Do you folks chamfer the edges of your Shapton Glass stones?
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Re: Chamfering Edges on Shapton Glass?

Post by Chappychap »

I'd be curious on the answer to this one as well... I haven't but have wondered if it would make sense too. Or would it just make it more easy to develop bad habits on the horizontal angle... not sure
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Re: Chamfering Edges on Shapton Glass?

Post by gladius »

I never have, no need. The stones I have purchased have been precision made, except...
I have flattened the bottom of a 500 though: It was uneven causing the glass bottom to rock on the Shapton holder. If the top is not flat, then that is a another thing.
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Re: Chamfering Edges on Shapton Glass?

Post by d_rap »

I do, with all my synthetic stones.

I find that when I let the long sides particularly go without chamfering that no matter how flat my surface and how frequently I flatten, the stone edges can catch a bit as I move the blade. A very slight barrier often develops there remarkably quickly, obviously somewhat grit dependent. I prefer the clean drop-off that chamfered edges guarantee.

Another argument is what Chappy alludes to above. An unchamfered edge is a place where a slight horizontal or angular mistake can bite. Why not meet the stone from empty space, at a dull or rounded edge, rather than at sharp 90° angle?
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Re: Chamfering Edges on Shapton Glass?

Post by michael1778 »

d_rap wrote: Sun Nov 08, 2020 8:57 pm I do, with all my synthetic stones.

I find that when I let the long sides particularly go without chamfering that no matter how flat my surface and how frequently I flatten, the stone edges can catch a bit as I move the blade. A very slight barrier often develops there remarkably quickly, obviously somewhat grit dependent. I prefer the clean drop-off that chamfered edges guarantee.
I have noticed this when I stopped lightly (and I do mean lightly) chamfering the edges, I will go back that practice.

Back and forth along the long axis only one cycle or two, at most. However, I am no expert by any imagination!
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Re: Chamfering Edges on Shapton Glass?

Post by Chappychap »

I'm convinced - will do this next time I sharpen. Thanks for a useful thread.
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Re: Chamfering Edges on Shapton Glass?

Post by ken123 »

I'll generalize this to natural and synthetic stones in general. If you have sharp jagged edges, chamfer them so you don't scratch the knife with stray scratches. Rinse the swarf away as it will have stray large particles and start clean. You may want to use a tomonagura. Round the edges rather than cutting sharp edges.

For new stones, I only chamfer one side. Why? Well this has to do with sharpening serrated edges. I use the sharp 90° edges to get into serrations more easily. Chamfered edges are too broad. I can go into this more if anyone is interested.

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Re: Chamfering Edges on Shapton Glass?

Post by Eli Chaps »

Thanks everyone.
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Re: Chamfering Edges on Shapton Glass?

Post by Eli Chaps »

Stone arrived today and to my surprise, the edges are chamfered from the factory. Might could use some touch ups at the corners but not too bad.

I hope the pictures show it alright...

Image

Image
Last edited by Eli Chaps on Wed Nov 11, 2020 3:25 pm, edited 1 time in total.
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Re: Chamfering Edges on Shapton Glass?

Post by d_rap »

Yes, appreciate the photos.

And of course, whether and when you'll do any chamfering will have to do with your own preferences, frequency of use and flattening regimen.
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Re: Chamfering Edges on Shapton Glass?

Post by ken123 »

... and of course as you wear the stone down, periodically reestablish your edges as needed.

Ken
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Re: Chamfering Edges on Shapton Glass?

Post by Eli Chaps »

Yep, will maintain the edges over time. At the least, it affirms that Shapton believes it is a good idea to chamfer the edges. :)
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Re: Chamfering Edges on Shapton Glass?

Post by dothedr3w »

I haven't felt the need to chamfer mine beyond what the factory does as I haven't noticed any of my knives grabbing or biting the edge. Ken does bring up a good point about serrated knives though.
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Re: Chamfering Edges on Shapton Glass?

Post by ken123 »

You'll get more stone edge grabbing on natural stones with their irregular borders.

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Re: Chamfering Edges on Shapton Glass?

Post by Eli Chaps »

CKTG 140 diamond plate ordered. :)
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