Grinding Dimples

D

Drillpressington

Joined
Sep 23, 2020
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1
Hello all,

Looking for techniques/tips for grinding the dimples/divots along the blade edge of kitchen knives. If this discussion was already had elsewhere, let me know. I was unable to find it.

I know it would normally be done on a narrow belt wheel but I don't have access to that kind of setup at the moment. Curious if anyone knew of other ways to go about it like over sized Dremel or die grinder wheels or something.

Thanks!
 
Hmm those anti-suction concavities are very shalliw, so that takes a grinding wheel with a very large circumference, too big for a dremel I would think. Plus you would need a complicated jig to repeat clean uniform grinds.

You could try it by hand, affixing sandpaper to a wood rod with an appropriate curve?
 
I'd be looking into finding a grinding wheel much like what goes on a bench grinder, dressing its surface to a slight concave shape to match how wide/deed you want the dimple to be then affixing it to some kind of grinder. Tough part will be making those plunges evenly and consistently without it looking like trash. Cleaning them up look into how people hand sand hollow ground blades.
 
If you’re talking about for better food release most are done with radius platens to mimic a very large contact wheel.
 
Drillpressington said:
Hello all,

Looking for techniques/tips for grinding the dimples/divots along the blade edge of kitchen knives. If this discussion was already had elsewhere, let me know. I was unable to find it.

I know it would normally be done on a narrow belt wheel but I don't have access to that kind of setup at the moment. Curious if anyone knew of other ways to go about it like over sized Dremel or die grinder wheels or something.

Thanks!
Click to expand...
Have you tried searching for the term "granton edge"?
 
A Granton edge is not intended for food release, but instead as a type of serration.
 
I disagree:
Granton edge knife
1517223.jpg
 
According to the articles I googled, the granton edge is for food release and several articles specifically stated they were not serrated edges. Based on my experience, they don't do diddley for food release. If you look at the picture Stacy put up, as soon as the food covers the top of the pocket, the pocket becomes a mini-vacuum chamber, which retards food release.
 
Stacy E. Apelt - Bladesmith said:
I disagree:
Granton edge knife
1517223.jpg
Click to expand...
I disagree :)
They key feature of a Granton Edge is the scallops cut into the blade. These indents are arranged alternatively on each side of the knife. For true Granton Edges, the scallops are hand ground and extend from the edge of the blade up into the centre. This creates an extremely sharp edge that holds its sharpness while remaining strong. The reason for this is that the scalloped edges create a thin sharp edge on one side that is reinforced on the sections where the blade is not scalloped.
g6tqbXY.png

I disagree again :D
Granton edge is a series of oval dimples along the knife blade. Grantons are also known as dimples, indents, divots, scallops and kullens and alternate down the blade. A Granton edge on a kitchen knife forms a slight air pocket between the blade and the food when cutting .
uPiLwuS.jpg
 
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My question is that if the knife is thick enough to really do a graton edge it would make for a thick blade. Maybe other have a solution for this but a lower grit finish and a convex or a S grind seems like the best way to cut down on sticktion.
 
If I needed to make them I think a modified chainsaw sharpener would be a good fast way
 
I modified a HF chain sharpener to do them. The wheel is too small to get a dimple long enough. I had to move the blade to elongate the groove. It looked horrible. What the chain saw sharpener would do well was make serrations in the edge of a hardened blade. I used it a few times to put five or six 1/4" wide serrations at the ricasso end of the edge of a camp knife for rope cutting. They looked pretty good.
 
Some professional ones use a larger wheel - not sure if it would make a difference ?
Another way I would try would be to mount an angle grinder upside down in a jig that lets it swing side to side.
 
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