Ffg bk15?

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Brew-Jitsu

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(edit: see clarification below) Has anyone seen one or tried it before? I've seen the FFG 17 on the forum, which is amazing, but I'd like to see how slicey a 15 could get if it was ground flat from the top of the spine.

That being said, is there anyone here skilled enough to try it on mine? I won't be offended if it doesn't come out perfect; it's more to try it out and share the outcome with others on BF.

Let me know what you think. I bet the 15 would be a nasty little bugger in a thinner profile.
 
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Err. Let me try to articulate this differently. What I'm trying to say is grind from the top of the spine straight to the edge, making each side FFG from the spine. The spine would be the same thickness, but a good percentage of material beneath the spine would be removed.
 
You need to check out what "Fisking" a bk5/15 is. Its basically convexing/thinning out the edge while knocking down the shoulder between the flat and swedge, would probably be right up your alley. There are a couple threads around here about it!

Found what I think is the only Fisking video. Start at 13 minutes to show a BK5 BUT I suggest you watch all of it cause... Its Jerry Fisk....

[video=youtube_share;DzBSjQFWyhM]http://youtu.be/DzBSjQFWyhM?t=13m1s[/video]
 
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iwouldhurtafly said:
You need to check out what "Fisking" a bk5/15 is. Its basically convexing/thinning out the edge while knocking down the shoulder between the flat and swedge, would probably be right up your alley. There are a couple threads around here about it!
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Nice. Sounds like we're on the same page. I will look at the threads but, in the meantime, does anyone know someone, outside of Fisk, that is known for doing this? Anyone with a belt sander and a little gusto willing to try it? I don't have a sander, otherwise I'd be all over it.

Thanks for adding the vid. Always looking for new ones to watch.
 
AlexWitte said:
Nice. Sounds like we're on the same page. I will look at the threads but, in the meantime, does anyone know someone, outside of Fisk, that is known for doing this? Anyone with a belt sander and a little gusto willing to try it? I don't have a sander, otherwise I'd be all over it.
Click to expand...

You would just have to find someone comfortable with doing regrinds. I am sure there might be a knifemaker or two who wouldn't mind... You probably could do it with some wet dry sandpaper on a soft surface like a mouse pad, a couple beers, some patience, and a little elbow grease. Keep in mind this is not exactly like what you are talking about, but is similar.
 
As mentioned, the 5 and 15 are FFG with a swedge on top. Convexing the shoulders as shown in the video would end up lookin' like this in cross-section... (drawing not to scale)

tumblr_ndtmfumAyY1t96dyxo1_400.jpg


...giving you a sleeker knife overall and a thinner edge. It's really just a matter of blending the planes together where they meet.

If you like, send me the knife with return shipping/insurance and I'll do the grind for you. Naturally, that will remove a good portion of the factory finish. I'm pretty booked right now, so I don't want to take on a full custom re-finish job at this time, but you can take care of that at your leisure. e-mail me at: james@terrioknives.com to confirm.
 
Awesome, James. Will do! I already took off the coating, and I don't care what it looks like when it's done. Don't need it back anytime soon, either. I'm glad you did the drawing, but I was thinking about removing even more than that. I'll leave it up to you. I will shoot you an email tomorrow. I look forward to sharing photos and possibly passing it around.
 
iwouldhurtafly said:
You would just have to find someone comfortable with doing regrinds. I am sure there might be a knifemaker or two who wouldn't mind... You probably could do it with some wet dry sandpaper on a soft surface like a mouse pad, a couple beers, some patience, and a little elbow grease. Keep in mind this is not exactly like what you are talking about, but is similar.
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Much obliged. Thanks for the input!
 
Zh9rtia.jpg


Here's what I was poorly trying to get at - a FFG 15, from the very top of the spine. I don't think it would be too thin in looking at it (my 15 in person, that is), but we'll see what magic James is able to work. :)
 
I think that it would require the swedge room be ground down to meet the top of the flat grind. Then, if you want you could thin the angle to make it slice better.
I don't really understand what the benefit of removing that much steel off the top would be. I don't see how it makes the knife better at anything.
What JT was talking about would be quicker and result in a knife that would slice better.
 
AlexWitte said:
Zh9rtia.jpg


Here's what I was poorly trying to get at - a FFG 15, from the very top of the spine. I don't think it would be too thin in looking at it (my 15 in person, that is), but we'll see what magic James is able to work. :)
Click to expand...

that would be too thin to support an edge. The angle would be too acute. You'd have to whack a secondary edge bevel onto it. Though you might be able to end up with something thinner than the factory.
 
Isn't the purpose of the swedge to remove material so it's not in the way for slicing?
I am a bit confused here.
 
Liam Ryan said:
Isn't the purpose of the swedge to remove material so it's not in the way for slicing?
I am a bit confused here.
Click to expand...

Well, I think it's a bit more involved than that. A swedge could be for weight reduction, aesthetics, for a sharpened fighting style swedge.. but I haven't heard the reason you suggested.
 
daizee said:
that would be too thin to support an edge. The angle would be too acute. You'd have to whack a secondary edge bevel onto it. Though you might be able to end up with something thinner than the factory.
Click to expand...

I guess I will just have to try it. I didn't expect so much doubt on this idea, but perhaps I'm ignorant on what is possible in this regard, but I'd still like to try it to share the results.
 
AlexWitte said:
I guess I will just have to try it. I didn't expect so much doubt on this idea, but perhaps I'm ignorant on what is possible in this regard, but I'd still like to try it to share the results.
Click to expand...

Edge bevels in carbon steel are typically 10-20deg per side. 10 would be getting quite delicate.
My calculations suggest that a flat grind to zero (no secondary bevel) on a 1" high 5/32" thick blade (swedge is irrelevent here) will produce a blade/edge geometry of roughly 4deg per side, which matches my intuition about grinding angles (having tried jigs ones before). That ain't gonna stand up too well. If you DO try it, please post results!
 
daizee said:
Edge bevels in carbon steel are typically 10-20deg per side. 10 would be getting quite delicate.
My calculations suggest that a flat grind to zero (no secondary bevel) on a 1" high 5/32" thick blade (swedge is irrelevent here) will produce a blade/edge geometry of roughly 4deg per side, which matches my intuition about grinding angles (having tried jigs ones before). That ain't gonna stand up too well. If you DO try it, please post results!
Click to expand...

That's darn acute. I'm not opposed to a micro bevel or small secondary, but I certainly wasn't thinking 4 degrees. I wouldn't be opposed to 10-12 degrees.
 
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