Hollow grinding a U2 - need maker

Cliff Stamp said:
By hollow I simply mean the primary grind is concave, not a specific orientation of the curvature.
-Cliff
if the curvature apex (if that the word for it) is not where it's suppose to be
or back to far you'll have a thicker edge and a thin aria to support it..
the cross section would look like Popeye's forearms hanging out there.....

get your compass and rule out..
a hollow can't be done on a flat grind the way hollow grinding is suppose to be done and placed where it belongs,,at least in the terms we normaly use....
the curvature of the wheel is greater than that of the angle of the flat grind..
put it on paper
like I said,,,
if you want to do a running back razor edge grind then that's a different story :)
 
not that well know I guess :D

the page I was on you couldn't tell if they were hollowed or not....
there you go..
a hollow running back razor edge grind.

the hollow is set back from the edge to what ever you want it to be then from the leading front point of the hollow it is somewhat flat ground..
is this what you meant???you can have it razor blade thin...

I did that stuff 25+ years ago..when no one wanted it that way.. :rolleyes:
tender ground thin but cuts likes hell :)

I still want to see your blade once done to compair :)
 
Dan Gray said:
the page I was on you couldn't tell if they were hollowed or not....
From that page :

"Now that we've broached the subject of the edge, let's talk about the Sebenza's edge bevel, one of its most delightful aspects. Even the photograph shows that this blade is ground to cut easily: the narrow (16/*18°) bevel flows easily into the high hollow grind with little shoulder to get in the way of cutting."

That description is basically everywhere the knives are, plus its the same grind on most production knives, especially the chunky sabre-ground ones. Yeah there is no limit to how thin you can grind them, you are basically set by either the stiffness of the steel or your ability to not burn it.

If the steel is really hard, 65+ hrc, you can go really thin to the spec's I noted. It doesn't hold the same on softer ones as they deform too readily. Plus there are issues with larger carbides when you start bring steels down that thin, especially when the edge angles go down to ~5 degrees.


-Cliff
 
Dan Gray said:
I rather talk about customs here..
Reeve is a custom knife maker, he designed the Sebenza. It isn't like that grind would behave any differently if he ground it himself or had one of the guys in the shop get it.

when are you sending that blade to me?
Shortly after I get it, so about a month or so.

-Cliff
 
Cliff Stamp said:
Reeve is a custom knife maker, he designed the Sebenza.
-Cliff
yeah I saw that on his site.. :)

Cliff Stamp said:
It isn't like that grind would behave any differently if he ground it himself or had one of the guys in the shop get it.
-Cliff
what do you mean ... had one of the guys in the shop get it?

if I had you make my knives would they still be Gray knives? or
Gray Stamped knives :confused: :)
 
Dan Gray said:
what do you mean ... had one of the guys in the shop get it?
He doesn't make the Sebenzas, he has people who work for him that do it.

if I had you make my knives would they still be Gray knives
If you had me make them it would be even money if you could call it a knife. Now if you had someone who knew how to grind to your specifications and they did it, it would not be any different than a knife you ground personally.

Now as for you calling it a Gray knife, that would probably mislead people, you could use something like "Gray Made". As for it being a custom or not, well that depends on your defination. I don't call a knife I buy a custom unless I influenced the design.

A large segment of the industry however uses the label to apply to knives made by one maker, outside of issues like plating, heat treating, forging, etc. . The line gets kind of blurry at that point though, even from that viewpoint.

Les Roberston argued for the performance of custom vs production for a long time based on one man vs shop, but that arguement falls apart when the shop is small and the workers skilled. If you have shops like Reeve and Dozier where the guys are actually "custom" makers in their own right, it is kind of illogical to argue that the knives they collaborate on to produce is inferior.

There is also a huge bias because when two custom makers do combine publically on one-of knives everyone calls it a custom, but if they do it in a shop it becomes production. But if they do it alone in a shop and chunk out huge runs of the exact same model it is still called custom. The defination is full of contradictions in how it is applied.

-Cliff
 
Cliff Stamp said:
if you had someone who knew how to grind to your specifications and they did it, it would not be any different than a knife you ground personally.

-Cliff
it would not be any different than a knife you ground personally.
really :( ,, your saying as long as you had the specifications and someone else did the work, you would call the knife made by you?

I wonder why I've bothered with this part time full time trade for 30 years..if I could have just gotten someone else to do it for me..
man now I feel like I've wasted my time ... you've messed up the rest of my day now Cliff ... :( now what am I going to do...I have grinders block now :(
 
Dan Gray said:
your saying as long as you had the specifications and someone else did the work, you would call the knife made by you?
No, as I noted that would likely give people the impression I made it. If it was a small shop then it would have a name, if it was working with apprentices the line gets blurry as at some point they have done so much work the product is as much theirs as yours. A lot of master craftsmen don't see it that way though. When I said it would not be different, I meant in regards to performance.

-Cliff
 
I got the blade back, way better looking than I expected. I figured on a mod only, but it looks like an actual NIB custom. For those curious, the geometry is 0.004, 0.012, and 0.021" at the edge, 1/8" back and 1/4" back, so I am more than pleased with how it turned out. For reference on just how thin this actually is, the little known large Sebenza is spec'ed at 0.023" behind the edge, so this U2 is now thinner than that at 1/4" back. The edge varies by about 0.001" in thickness mainly due to the grinding I did before I sent it off. Dan drop me an email with your address.

-Cliff
 
Cliff Stamp said:
I got the blade back, way better looking than I expected. I figured on a mod only, but it looks like an actual NIB custom. For those curious, the geometry is 0.004, 0.012, and 0.021" at the edge, 1/8" back and 1/4" back, so I am more than pleased with how it turned out. For reference on just how thin this actually is, the little known large Sebenza is spec'ed at 0.023" behind the edge, so this U2 is now thinner than that at 1/4" back. The edge varies by about 0.001" in thickness mainly due to the grinding I did before I sent it off.
Dan drop me an email with your address.

-Cliff

cool :)
it's no secret here it is..
Dan Gray
686 Main RD
Brownville Maine 04414
 
I'll drop it off tomorrow, it should take 1-2 weeks if it doesn't hit customs, could be a lot longer if someone gets curious. This is no rush on sending it back. While I am very interested in its performance, I have a huge pile of blades on backlog to work with. Right now it isn't sharpened, if you want to sharpen it and cut with it that is fine.

-Cliff
 
Cliff Stamp said:
I'll drop it off tomorrow, it should take 1-2 weeks if it doesn't hit customs, could be a lot longer if someone gets curious. This is no rush on sending it back. While I am very interested in its performance, I have a huge pile of blades on backlog to work with. Right now it isn't sharpened, if you want to sharpen it and cut with it that is fine.

-Cliff
gee-gads Cliff 1-2 weeks.? I thought you were here in the States? :confused:
if so Priority mail would be about 2 days..and $3.85 I'll pay the postage if you want.
 
Very well, the knife was ground very close to the specifications. No hesitation in recommending Krein if you want similar work done.

-Cliff
 
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