Messages

The thing is, the tip has been rounded out by removing metal, so there is no real way to bring everything back to how it should be. If you want to restore the angle of the tip as it was initially, the best option would probably be to sand one or two millimeters out of the entire height of the blade end, at the original angle.

As it is heavy work, and probably not that important, I would go the belt sander or wheel side way for just a tiny bit to reduce the bevel at the tip and bring it closer to a point.

Then sharpen it as required. You may have to lift the tip a tiny bit, and/or pivot slightly, depending on how the bevel goes at the tip.

Lifting does not round out the tip if done properly, keeping the tip clear from the stone's shoulders until the end. But it should barely be required here, as the edge does not curve upward too much.  If anything, lifting increases the angle, so it reduces bevel height, which is exactly what you want in this case at the tip. Don't pivot away from you too much.

I think knife restoration experts such as @Kwakster will have dealt with much worse and could provide useful insight...

And cleverly enough, if you don't enter anything in the input box next to the search button at the top, it will graciously redirect you to the same options window.

So when I search for words only, I use it, and also if I need to add a few options.

Also, when you're in a given topic/board, the dropdown next to the top search button will default to "this topic"/"this board" so you will only get hits inside the current context. But you can still revert it to "Entire forum".

I have no experience with these, and my go-to website (Rich's Sharpening Handbook) doesn't either.

No Tormek jig will help you in this case. If I *really* wanted to sharpen these on a Tormek, I'd use a MB-100/MB-102 and a drill collar  to sharpen the rounded sides of the point on the side of a diamond wheel. Or you could do it freehand. Then sharpen the flat faces of the point on the sides/shoulders of the diamond wheel.

But a belt sander or a simple diamond plate will be much better suited. One word of caution : you should try to limit sharpening the sides to the bare minimum (ie stay close to the point) to avoid changing the diameter of the bit.

Welcome to the forum.

It is in the upper right corner as seen in the attached picture.

I think this new kit is a good idea in principle.

Where I live, the kit is roughly equivalent to a free KJ-145 + free storage box + free magnifier. For those who have use of these, it could be worth buying with their initial Tormek purchase.

I fully agree : I have set up an Ikea ceiling light with multiple spotlights so the Tormek is lit from different angles.

I believe that whatever burr is still here after sharpening will be taken care of by the grass itself, and a thick branch or loose stone will nick the blade no matter what.

The wear on the SG stone and the hassle of setting up the Tormek for lawnmower blades make it ill suited to the task, especially when one includes the time required to true the SG afterwards.

The system mentioned by GeoBoy makes much sense for people who do that on a regular basis and for people who do that only occasionally, a belt sander,  bench grinder or angle grinder will work better and faster.

I completely agree on the self-centering feature, with the usual provision that the self-centering feature came at the cost of the adjustable distance.

I think they'd have been better off sticking to their initial position that convexing doesn't matter on a small bevel, and convexing can't be done with a Tormek on large bevels.

And I think it's important that someone who dedicates time reading the forum understands that they won't get belt/backstand-grade convexing with a Tormek.They might not even get much convexing at all.

Still, this convexing thing is as obscure as ever: there is no explanation whatsoever of why this back-and-forth movement on a convex sharpening medium would end-up producing a convex blade.

A Tormek (and in particular a 200mm one) is intrinsically a bad candidate for convexing a blade. Especially very close to the edge, where the blade will -no matter what - retain the concavity that is the negative image of the wheel.

In addition to that, you don't manage the height over which you shape (for lack of better word) the blade, so it would be quite the miracle if said height matched the blade's original bevel height.

In this example, I think the recurve is due to the bolster, which in turn is there for safety reasons (it prevents the index finger from sliding onto the blade), and a desire to blend it smoothly with a thin blade. The recurve has no interest in terms of how you cut, but it *will* be a PITA for sharpening.

As a general rule, knives with a bolster will be troublesome when sharpening with a Tormek : you will usually end up with a dent, usually not right at the bolster. Knives with a recurve will be troublesome when sharpening with a Tormek : you won't be able to sharpen the recurve harmoniously except freehand. Also, although recurves are always a bit tricky, a rod-base sharpening system with a narrow plate will be much, much easier to use and will allow controlled-angle sharpening. For light touch-ups, a belt system with thin, flexible belts and a bit of slack will also make the sharpener's life easier.

Japanese western-style knives are more suited to Tormek-assisted sharpening : they have no bolster and only have convex blades. Interestingly enough, the Japanese don't use this kind of flexible blades. Instead, they use massive (wa-deba) blades for filleting fish, or very thin straight blades (called "sujis" or "lasers") for thin slicing.

Isn't it surprising that he said that the grinding direction doesn't matter?

In my experience, the grinding direction doesn't matter (much) in terms of final sharpness. There are some knives, mostly of very soft steel, where sharpening edge-trailing will indeed form a much longer, foil-like burr. However, these steels are so soft that the foil burr will be removed easily anyway ... and edge retention will be bad either way.

That being said, it might be hard to tell from sound and feel alone when you're done honing a foil burr. I'm not sure it takes much longer though.

I also found that grinding edge-leading with the SJ stone might give the impression that there is no burr, when there actually is a line of well-aligned plastified steel just at the edge.

Eventually, I didn't find much of a difference in terms of edge retention between edge-leading and edge-trailing.

Maybe it's splitting hairs in the context?

Or whittling hair ? I don't know if it was intentional, but nice one anyway 

If you're willing to go down this rabbit hole, you will want to check this thread, which includes a useful spreadsheet in the first post, along with very a detailed discussion of how it was elaborated by @Gilles.

Just my $.04 :

With regards to removing the leather wheel being a breeze, I agree ... with a caveat : if you need to remove the leather wheel when sharpening, you probably also need to remove the grindstone when honing with a jig, right ? This was the whole reason behind the "hone your knives freehand at an angle" method before the KS-123 was advertised for honing. And when the KS-123 was demonstrated, Sebastian had to remove the grinding wheel.

I have spoken to a few of my engineer friends and they have the same opinion, a machine that has jigs and is designed and sold as a "precision" sharpening system relies on "feel" for what I have read and watched as possibly the most important sharpening steps in the process.

Well, it doesn't rely (much) on feel for planer blades or drill bits. But knives are an entirely different matter anyway : aside from the occasional Nakiri (and even then... but I digress), I don't know of many knives that are perfect rectangles from blade heel to blade tip. So the protrusion distance varies, and so does the angle when you hold your knife in a jig resting on the USB.
Moreover, due to blade geometry choices discussed at length on this forum and countless others, some knives require just lifting the blade when coming closer to the tip, some require combining this with a clockwise rotation of the blade, some with a counterclokwise rotation. And that even further depends on your choices as a sharpener : constant edge angle, constant bevel width, or something in between.

So even with a 250mm honing wheel you will have removed only one step requiring "feel". One step which, as @WimSpi pointed out, can also be streamlined with the Tormek honing wheel at the expense of using more accessories or even calculators.
There will still be many factors requiring decision-making, feel, skill and experience that no jig will help you with.
Those are much more critical than a couple degrees difference when honing : you won't "negate all the work done in the sharpening stage by a very basic mistake by rolling over the edge" with small, short variations : at worst, you will degrade your initiel BESS score but your overall edge retention should be fine if you're not careless. You *will* mess up a knife by not caring what you do beside the flat part of the blade. Same thing if you don't hone (^^) your skills when it comes to laying down the blade on the grindstone properly, or adjust sharpening pressure, or lateral speed, or ...

And although I hone as much as possible at a controlled angle, I am glad I have spent time honing freehand as it allows me to estimate how efficient my controlled honing step is, using the visual and tactiles cues mentioned by @Herman_Trivilino.

Just so I understand the whole picture, how will you be setting up grinding angle beforehand ?

I was having a strong feeling of "deja vu". I think this is why :

https://forum.tormek.com/index.php/topic,5601.0.html