kb0rvo
The photos show exactly what I term as primary & back bevels the better quality Japanese knives - hardness around 60 > have a primary bevel of 15˚ on each face so 30˚ total and I usually thin them with a back bevel of 10˚ total 20˚ although it would be desirable to do an even finer back bevel angle . The one sided edges such as on Yanagibas are around 30˚for the primary cutting edge and then 20˚ for the back bevel . The other side of these knives are hollow ground and whilst sharpening it is necessary to remove the burr by laying this side on a flat stone (flat) and running it gentle over the stone to remove the burr.
I have been looking at making an HK-50 possible out of some aluminium plate depending on what I can find since I spent a long time putting a back bevel on a couple of Japanese knives that were well used and had not been sharpened at the right angles for a long time it took over an hour to put a the back bevel on them with an "Edge Pro" where as I am certain I could vastly reduce that time using a Tormec with an HK-50 set up.
I like to use the edge pro for the primary bevels and often run the blade on the leather wheel to finish then off .
Since I charge to sharpen I find in general sharpening knives on the Tormec can easily go wrong but if a knife needs a repair or real tapering the Tormec would be my choice. I suspect I will use the Tormec a lot more once I have fabricated a good HK-50.
The photos show exactly what I term as primary & back bevels the better quality Japanese knives - hardness around 60 > have a primary bevel of 15˚ on each face so 30˚ total and I usually thin them with a back bevel of 10˚ total 20˚ although it would be desirable to do an even finer back bevel angle . The one sided edges such as on Yanagibas are around 30˚for the primary cutting edge and then 20˚ for the back bevel . The other side of these knives are hollow ground and whilst sharpening it is necessary to remove the burr by laying this side on a flat stone (flat) and running it gentle over the stone to remove the burr.
I have been looking at making an HK-50 possible out of some aluminium plate depending on what I can find since I spent a long time putting a back bevel on a couple of Japanese knives that were well used and had not been sharpened at the right angles for a long time it took over an hour to put a the back bevel on them with an "Edge Pro" where as I am certain I could vastly reduce that time using a Tormec with an HK-50 set up.
I like to use the edge pro for the primary bevels and often run the blade on the leather wheel to finish then off .
Since I charge to sharpen I find in general sharpening knives on the Tormec can easily go wrong but if a knife needs a repair or real tapering the Tormec would be my choice. I suspect I will use the Tormec a lot more once I have fabricated a good HK-50.