Convex Edges

Derek, I kept watching the video, and it seemed like he was gripping the knife pretty hard. He even had it to a point where he was using his palms to press down on the blade. Not to say you are wrong, but maybe I'm not seeing something. If you watch his finertips, they get to be pretty white. I'm actually going to try your technique as soon as I post this. I know I'm still a novice with blades, and am willing to try all techniques I run across. I was just seeing if you or anyone else saw what I saw.
 
Myrighteye said:
Derek, I kept watching the video, and it seemed like he was gripping the knife pretty hard. He even had it to a point where he was using his palms to press down on the blade. Not to say you are wrong, but maybe I'm not seeing something. If you watch his finertips, they get to be pretty white. I'm actually going to try your technique as soon as I post this. I know I'm still a novice with blades, and am willing to try all techniques I run across. I was just seeing if you or anyone else saw what I saw.
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Derek is talking about on a belt, if your talking about the Virtuavoice vid he was stone sharpening, and removing a lot of material, not just sharpening. On a belt you want to go softer so the belt doesn't fold around the edge and take the actual edge down.
I could have misread what you were talking about though.
 
I thought he was talking about me copying the video... Anywho, I actually did learn my lesson on pressure the hard way with a practice knife. So when I was on the belt grinder, I just put a light amount of pressure and took my time with the entire knife. I'm also sharpening on sandpaper and a mouse pad. Belt gas been done and over with.
 
Myrighteye said:
I thought he was talking about me copying the video... Anywho, I actually did learn my lesson on pressure the hard way with a practice knife. So when I was on the belt grinder, I just put a light amount of pressure and took my time with the entire knife. I'm also sharpening on sandpaper and a mouse pad. Belt gas been done and over with.
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Sorry, should have been paying more attention so I could clarify. On a stone, yeah, use as much pressure as you want, that isn't a malleable surface so it isn't going to do any wrapping around the edge. On a belt sander, there a think a soft touch would help but really not having used one very often I can't say for sure.

Mostly I was referring to using a mousepad and sandpaper, or a leather strop, or something along those lines for your finish work. The only pressure needed there is the weight of the knife, otherwise you will get that edge wrapping that Thorny was talking about, which works against you and your sharpening efforts. Something a lot of people don't consider is that while you can take a v-grind and round it over, usually during the process of that you will end up with a steeper angle at the edge unless you take the time to thin out the edge a lot, so while you are rounding off the shoulder between the primary and second grinds, normally you are also removing material from the very apex of the edge and that shortens the distance, creating a steeper angle, which is why I suggest increasing your angle that you are holding the knife, as well as coating the edge in sharpie to make sure you are getting all the way to the very edge. If you don't thin out the material a good bit then even when you think you are getting all the way to the edge there are times where you simply are not, even though it looks that way.
 
DerekH said:
Sorry, should have been paying more attention so I could clarify. On a stone, yeah, use as much pressure as you want, that isn't a malleable surface so it isn't going to do any wrapping around the edge. On a belt sander, there a think a soft touch would help but really not having used one very often I can't say for sure.

Mostly I was referring to using a mousepad and sandpaper, or a leather strop, or something along those lines for your finish work. The only pressure needed there is the weight of the knife, otherwise you will get that edge wrapping that Thorny was talking about, which works against you and your sharpening efforts. Something a lot of people don't consider is that while you can take a v-grind and round it over, usually during the process of that you will end up with a steeper angle at the edge unless you take the time to thin out the edge a lot, so while you are rounding off the shoulder between the primary and second grinds, normally you are also removing material from the very apex of the edge and that shortens the distance, creating a steeper angle, which is why I suggest increasing your angle that you are holding the knife, as well as coating the edge in sharpie to make sure you are getting all the way to the very edge. If you don't thin out the material a good bit then even when you think you are getting all the way to the edge there are times where you simply are not, even though it looks that way.
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Great info here. Thanks for clarifying Derek
 
Okay, that makes a lot more sense. I actually haven't tried anything yet, been busy with other projects, so I'll post pictures as soon as I get things done. Thanks for the info! Seriously, though, I'm glad I joined this forum finally lol!!
 
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