convex grind tips

What's wrong with that if it gets the knives sharp? :confused:

I'm with you here Thom.... I'd never really heard much about convex edges before finding this forum and acquiring my first Busse. So I asked a couple noob questions. Some were answered, others weren't.... but I kept reading and now feel "pretty" comfortable in my understanding....

Three grinds: concave, convex and V

Concave(hollow ground) - very sharp, kinda delicate, difficult to maintain

V - best overall edge (not as strong as convex, not as sharp as concave) that is easy to maintain for skilled users or folks with a sharpening "system".

Convex - toughest under hard use because it puts more metal behind the edge. If done well can be almost as sharp as a V. Convex can be a fixed amount of edge (1/8 in or whatever) or the whole blade can be convex. The latter is the sharpest for an given geometry. Convex edges can be easily "touched up" in the field by stropping.

I've read a lot of things recently that really put down V grind, saying it will ruin your Busse or is only good for "cheap" knives.... IMO - this is just silly! V grind is great. So is Convex. It seems to me this mostly depends what your knife is made of and what you are using it for... Knowing this you can choose the knife, the steel and the edge that suits what YOU do with your knife.

Some examples:

If you have a razor thin (ie - Spyderco ZDP Caly Jr) super hard blade, used primarily for slicing, a V grind makes perfect sense.

If you have a heavy duty chopper (ie - Busse FBM-LE) where the steel deforms rather than chipping out carbides, used for chopping wood (or cars or whatever :D ) that you may need to maintain in the field a convex edge seems perfect.

Most choices are not so clear cut. You use your knife to open the mail, prune some trees, cut some rope etc etc. One of the real strengths of a knife is it's flexibility in handling a wide variety of tasks....

Does that mean you shouldn't put a V grind on the Busse or a convex on the Spyderco??? Not at all. If that's the right combination for what you do, go for it...

To me, when folks say you 'have to have a convex edge on a Busse', what they are really saying is Busse blades are tough and they get used tough and if you keep a convex edge it is the best fit for the steel and the use it usually sees.

Now, I'm just a user and these are the results of reading and my limited trials. I welcome input from the fine folks around here as to whether I'm on the right track about this.

Ken
 
Sharpmakers are for V ground edges. Stropping on a mousepad/leather strop is how you maintain the convex edge that all Busse's have. Sharpmakers take out the convex edge.

Anyone have a good supplier for those stropping compounds you sometimes hear about? I live in a small mountain town, so the internet is my supplier for most stuff.

This is where I shop for stropping goods and steel or ceramic rods.
http://www.handamerican.com/
Here is a good piece of info on edges.
http://home.nycap.rr.com/sosak/convex.htm
And here is a rather interesting resource that I would like to see some of us add to.
http://www.knifehow.com/
 
I have an unanswered n00b question: Is it necessary to glue the sandpaper to the mousepad using the mousepad technique????:confused:
 
Does the sandpaper mess up the coating.....On second thought, if it needs to be resharpened the coating is probably scuffed already.
 
I love when these threads come up. Always a great refresher for me.

I think the Convex Edge is more important, or stands out more, on larger knives that need the extra steel behind the edge while chopping. But I think V grinds work just fine as well.

I could be wrong but I think smaller knives, not designated choppers, do fine with a V grind.

I have had success with the mouse pad/sand paper method for convex. But I'd like to try VTW's initial suggestion. Very cool. :)

The Apex Edge Pro helps me get excellent V grinds. (I need a cheater ;) )

Good thread.
 
Does anyone know of any videos anywhere showing the correct motion for the sandpaper/mousepad technique? I took my SS4 fishing for steelhead down in Clearwater, and I used it for everything, and it ended up pretty dull. I have all the different grits up to 2000, and have read all the advice and looked up more on my own, but all I have seem to done is give the coating a 2000 grit finish for a few mm and the blade is still pretty dull. It goes without saying that I suck at sharpening.
 
you know, making a video on the different sharpening methods and how they are done would be good. Showing is so much better than explaining. But who would make it?? Maybe we should get Cliff to do it.


As long as it isn't noss4 we should be ok:D
 
I'm with you here Thom.... I'd never really heard much about convex edges before finding this forum and acquiring my first Busse. So I asked a couple noob questions. Some were answered, others weren't.... but I kept reading and now feel "pretty" comfortable in my understanding....

Three grinds: concave, convex and V

Concave(hollow ground) - very sharp, kinda delicate, difficult to maintain

V - best overall edge (not as strong as convex, not as sharp as concave) that is easy to maintain for skilled users or folks with a sharpening "system".

Convex - toughest under hard use because it puts more metal behind the edge. If done well can be almost as sharp as a V. Convex can be a fixed amount of edge (1/8 in or whatever) or the whole blade can be convex. The latter is the sharpest for an given geometry. Convex edges can be easily "touched up" in the field by stropping.

I've read a lot of things recently that really put down V grind, saying it will ruin your Busse or is only good for "cheap" knives.... IMO - this is just silly! V grind is great. So is Convex. It seems to me this mostly depends what your knife is made of and what you are using it for... Knowing this you can choose the knife, the steel and the edge that suits what YOU do with your knife.

Some examples:

If you have a razor thin (ie - Spyderco ZDP Caly Jr) super hard blade, used primarily for slicing, a V grind makes perfect sense.

If you have a heavy duty chopper (ie - Busse FBM-LE) where the steel deforms rather than chipping out carbides, used for chopping wood (or cars or whatever :D ) that you may need to maintain in the field a convex edge seems perfect.

Most choices are not so clear cut. You use your knife to open the mail, prune some trees, cut some rope etc etc. One of the real strengths of a knife is it's flexibility in handling a wide variety of tasks....

Does that mean you shouldn't put a V grind on the Busse or a convex on the Spyderco??? Not at all. If that's the right combination for what you do, go for it...

To me, when folks say you 'have to have a convex edge on a Busse', what they are really saying is Busse blades are tough and they get used tough and if you keep a convex edge it is the best fit for the steel and the use it usually sees.

Now, I'm just a user and these are the results of reading and my limited trials. I welcome input from the fine folks around here as to whether I'm on the right track about this.

Ken

Exactly my thoughts as well:thumbup:
 
I'm with you here Thom.... I'd never really heard much about convex edges before finding this forum and acquiring my first Busse. So I asked a couple noob questions. Some were answered, others weren't.... but I kept reading and now feel "pretty" comfortable in my understanding....

Three grinds: concave, convex and V

Concave(hollow ground) - very sharp, kinda delicate, difficult to maintain

V - best overall edge (not as strong as convex, not as sharp as concave) that is easy to maintain for skilled users or folks with a sharpening "system".

Convex - toughest under hard use because it puts more metal behind the edge. If done well can be almost as sharp as a V. Convex can be a fixed amount of edge (1/8 in or whatever) or the whole blade can be convex. The latter is the sharpest for an given geometry. Convex edges can be easily "touched up" in the field by stropping.

I've read a lot of things recently that really put down V grind, saying it will ruin your Busse or is only good for "cheap" knives.... IMO - this is just silly! V grind is great. So is Convex. It seems to me this mostly depends what your knife is made of and what you are using it for... Knowing this you can choose the knife, the steel and the edge that suits what YOU do with your knife.

Some examples:

If you have a razor thin (ie - Spyderco ZDP Caly Jr) super hard blade, used primarily for slicing, a V grind makes perfect sense.

If you have a heavy duty chopper (ie - Busse FBM-LE) where the steel deforms rather than chipping out carbides, used for chopping wood (or cars or whatever :D ) that you may need to maintain in the field a convex edge seems perfect.

Most choices are not so clear cut. You use your knife to open the mail, prune some trees, cut some rope etc etc. One of the real strengths of a knife is it's flexibility in handling a wide variety of tasks....

Does that mean you shouldn't put a V grind on the Busse or a convex on the Spyderco??? Not at all. If that's the right combination for what you do, go for it...

To me, when folks say you 'have to have a convex edge on a Busse', what they are really saying is Busse blades are tough and they get used tough and if you keep a convex edge it is the best fit for the steel and the use it usually sees.

Now, I'm just a user and these are the results of reading and my limited trials. I welcome input from the fine folks around here as to whether I'm on the right track about this.

Ken

The voice of reason. Good on you, and Thanks for your input!:thumbup:
 
I used to own three SHBM's and two SHSH's. I changed the edges on all five of them to a very thin (read the edge was about 1/4" of an inch from the cutting edge to the coating) profile. They were all converted to the V grind. The thin edges did fine on all woods I encoutered in Both California and Florida. They would CUT though. The only problem I ever ran into was chopping roots or other materials like an accidental rock or something. But damage just rolled can't remember ever needing to grind out any chips. The cutting perfomance was improved by at least double.

I once had a SHBM with me in the truck with co-worker at the time. He and I were going to remove two lemon trees from a ladys backyard, stumps and all. He had a chainsaw and I wanted to use the Busse. After about ten minutes he came back there with the chainsaw and I had one of the trees that were ten feet tall completely limbed and was working on the stump underground. I was amazed as much as he was. We never did fire up the saw. The blade got dull towards the end, but it did the job. Lemon trees must be pretty soft cuz they were a breeze....I am going to thin out at least one of my FBM's to that thickness an compare it with the other one......... Gotta go talk Boots with my other co-worker later:thumbup:
 
Alright boot discussion is over. Budget discussion is over. Now Amy-O needs to let us know if the big secret has a convex grind on it....;)
 
I used to own three SHBM's and two SHSH's. I changed the edges on all five of them to a very thin (read the edge was about 1/4" of an inch from the cutting edge to the coating) profile. They were all converted to the V grind. The thin edges did fine on all woods I encoutered in Both California and Florida. They would CUT though. The only problem I ever ran into was chopping roots or other materials like an accidental rock or something. But damage just rolled can't remember ever needing to grind out any chips. The cutting perfomance was improved by at least double.

I once had a SHBM with me in the truck with co-worker at the time. He and I were going to remove two lemon trees from a ladys backyard, stumps and all. He had a chainsaw and I wanted to use the Busse. After about ten minutes he came back there with the chainsaw and I had one of the trees that were ten feet tall completely limbed and was working on the stump underground. I was amazed as much as he was. We never did fire up the saw. The blade got dull towards the end, but it did the job. Lemon trees must be pretty soft cuz they were a breeze....I am going to thin out at least one of my FBM's to that thickness an compare it with the other one......... Gotta go talk Boots with my other co-worker later:thumbup:


good story. How did you work on the stumps??
 
good story. How did you work on the stumps??
After limbing and chopping the tree to about a one foot tall stump, I dug around the roots. (It was in sandy soil) with the side of the blade. then once they were exposed I chopped through them, working around the tree in a circle. It hit a lot of sand and held up great. I wouldn't want to do this with an oak tree though. Much harder wood.:thumbup:
 
After limbing and chopping the tree to about a one foot tall stump, I dug around the roots. (It was in sandy soil) with the side of the blade. then once they were exposed I chopped through them, working around the tree in a circle. It hit a lot of sand and held up great. I wouldn't want to do this with an oak tree though. Much harder wood.:thumbup:


considering all the silica and rock the blade held up really well. I have blunted plain carbon steel blades just chopping a small citrus tree. So that is excellent performance when you throw in the digging.
 
considering all the silica and rock the blade held up really well. I have blunted plain carbon steel blades just chopping a small citrus tree. So that is excellent performance when you throw in the digging.


Oh yeah, I would have had some serious chipping if it were any of the other steels I used. I probably would have had to regrind the bevel big time.
 
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