Curved blade on a wet stone

[Mmm390]

I took a long break from wet stones because whenever I would attempt to sharpen curved blades or blades with a lot of belly in them I would end up destroying the curve in them.
This week I took the stones back out to practice....and I've gotten a lot better. I can get my edges hair popping sharp.
But I'm still having slight issues messing up the curve in the blade.

At first I was having issues destroying the curve right in the middle of the blade...
I guess you would call it its apogee. Now I'm having issues messing up the curve more towards the bottom of the blade towards the handle.
Most of my knifes have a distal taper btw.

What am I doing wrong?
What should I avoid doing?
What should I be doing?

Thanks!

 

[bucketstove]

What am I doing wrong? What should I avoid doing? What should I be doing? Thanks!

Hi,
Are you using magic marker to see where you're grinding?
Are you watching where the knife meets the stone?
It is possible to figure it out that way
Basically, you should maintain angle along the curve by maintaining perpendicularity (sight picture),
and looking to see that the edge is contacting the stone,
going away from yourself, look for daylight to diappear, shadow means edge contact (angle match)
going towards yourself, there is shadow under edge when angle is too low, so keep raising until shadow disappers, then you're matching the angle
visual aids below

advice-for-sharpening-distal-taper.1642617/#post-18782254
sharpmaker-for-touching-up-cold-stee-kukri.1642408/#post-18816137

Hi,
here are some visual aids,
sharpen in sections,
the karambit portion like this,
and belly portion like regular knife ,
pivot to maintain green sight picture

spydercosharpmaker.pdf


https://imgur.com/a/kIiMVWF
https://imgur.com/a/kIiMVWF


sharpening-maintainangle-lifthandle-levelstone.gif when sharpening on a level stone, lift handle when you reach belly/tip so they get sharpened at same angle


sharpening-maintainangle-pivotblade-tiltedstone.gif
on an inclined/tilted sharpening stone, pivot when you reach belly/tip so it sharpens at same angle as the rest of the blade
Sharpmaker view its vertical

sharpening-maintainangle-pivotblade-tiltedstone-16-sharpmaker.png



grind in sections

rub stone on the blade sharpening recurves - Joe Calton

rub blade on stone Sharpening a convex recurved blade on a bench stone : Forester

grind behind the edge on beltsander in one loopy motion (raise handle up down to maintain sight picture ) Regrind : Cold Steel Kukri Machete

What is your goal, even bevel width (cosmetic), or same edge angle (pictures below)?
Straight? Yeah, for same angle, you have to hold blade vertically as sharpmaker manual says,
and you also have to pivot for the curved bits ,
to keep the edge outline perpendicular to stone outline,
see all the pictures below, maintain the green square

A karambit version , slight modification compared to spydercosharpmaker.pdf


https://imgur.com/a/kIiMVWF
https://imgur.com/a/kIiMVWF


sharpening-maintainangle-pivotblade-tiltedstone.gif
on an inclined/tilted sharpening stone, pivot when you reach belly/tip so it sharpens at same angle as the rest of the blade
Sharpmaker view its vertical

sharpening-maintainangle-pivotblade-tiltedstone-16-sharpmaker.png

 

[HeavyHanded]

You have to elevate the handle to hit the same angle on the belly. The angle is perpendicular to the edge.

Along a straight portion it is straightforward, angle is line run straight back to the spine. As you get into the belly the angle is still run back to the spine, but now moving around a radius.

Press the edge of a plate against the counter so it tips up on its taper. Now rock the plate as though a section of it was the sweep of a belly. The spot on the plate rim that was 90° to your original contact point will elevate.

Flat:

Belly starting, handle elevating:

Tip, handle at max elevation for this knife:

 

[Mmm390]

Wow !

Great info and visuals!

Thanks guys