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• Tuesday, August 01st, 2017

Woodturner's Wonders CBN wheel for Tormek

I was pretty much content with my Tormek for grinding tools for 16 years. It sacrificed speed for relaxed and reliable grinding with excellent jigs, especially the SE-77. Though that tradeoff suits me, I like woodworking a lot more than sharpening, so a faster pace at the grindstone was always welcome. Thus I was drawn to try a CBN grinding wheel available from Woodturner’s Wonders.

After working with a CBN wheel for several months, I am completely sold. The main reasons are simple: It is much faster than the Tormek OEM wheel, and it never needs dressing. For my sharpening system, detailed in an earlier post, the 200-grit wheel works extremely well.

I can grind the primary bevel out to the edge, such as for completely reshaping the edge, with no worry about drawing the temper, even using the wheel dry. From there, I will usually do a bit of work on the 45µ DMT DiaSharp stone, and progress from there. If I stop grinding the primary bevel short of the edge, I may go directly to the 9µ DiaSharp, or touch up on the 45µ, depending on what I am dealing with. In any case, I then move from the 9µ, to the 3µ DiaSharp, and finish with the 0.5µ Gukomyo. Creating even substantial camber on a plane blade using the CBN wheel, particularly with the SE-77 jig, is so easy that it feels like cheating.

Woodturners Wonders sells these Tormek replacement wheels, called “Tornado Waterless CBN Wheels,” in grits from 200 to 1200. Depending on your sharpening system, you may want to consider the finer grits. Of course, finer grits are slower but leave shallower scratches. I found the 600 to be slower than I wanted, but it still beat the Tormek OEM wheel.

CBN wheel for Tormek

The Tornado wheel is two inches wide, flat and true, 10″ in diameter, with one-inch sidewalls. If I were a piece of tool steel, I’d wave a white flag at first sight of this thing. CBN, cubic boron nitride, is a crystal lattice of boron and nitrogen molecules, with a hardness near that of diamond, but with superior chemical and thermal stability, which increases its durability. Ken Rizza of Woodturner’s Wonders, the same guy who sells this great lamp, also sells a wide variety of other CBN wheels for regular bench grinders, including radius-edge wheels.

By the way, fellow Tormek users, I do not miss the touted dual-nature (220/1000-grit) of the Tormek OEM wheel, which is achieved by using the grading stone. I have always found this to be of marginal benefit and just not worth the hassle. Incidentally, the Tormek leather honing wheel does not get much use in my shop; it is not part of my main sharpening system.

The Tornado wheel can be used dry on the Tormek. Aggressive sharpening will produce some heat but I have not found this significant because the work is done so quickly. However, I prefer to use a little water to reduce the spread of the steel dust, including into the air. I just wipe off the accumulated steel dust on the tool itself.

[UPDATE: Based on Ken Rizza’s comment (see below), I did some more experimenting and found that just two or three light spritzes of water on the wheel is sufficient to keep the steel dust contained. I’m done grinding before this small amount of water evaporates a few minutes later, leaving the stone dry. I will not use water in the trough at all. To emphasize, heat build-up on the tool is not an issue and is not the reason I use the water.]

One more thing. If your Tormek wheel, like mine, has been on since the pre-smart phone era, it may be tough to get off. The folks at Tormek advise us to remove the stone with the shaft, use penetrating oil on both sides of the shaft, and let it work in overnight. Tap the shaft with a mallet. Repeat. It may take days. Don’t ask me how I got the wheel off my Tormek because it wasn’t pretty.

This review of the WTW CBN wheel is unsolicited and uncompensated. I just want you to have great tools . . . so you can make great stuff from wood.

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10 Responses

  1. My Tormek stone is getting mighty small and I’ve had my eye on these. I would like to hear more about your use of the wheel dry vs. with water: do you put water in the trough, or just squirt some with a spray bottle as needed? When used dry, how hot does the steel workpiece get? I imagine one does not leave the wheel soaking in the water! One big reason I’d consider the CBN is for sharpening my planer knives; any insights to offer on those?

  2. 2
    Tico 

    Great review, Rob. I own the first generation Tormek and don’t like it. The guide rod, for want of a better term, is flimsy. Getting a simple square edge is not assured. I don’t like having to true the edge of the stone.
    I see from various reviews that the company has improved all aspects of the equipment, making me reconsider getting a new version. The CBN wheel looks like the ticket for happy grinding.

  3. 3
    Rob 

    Hi Jim,

    First, buy one, you’ll love it. The 200 works for my sharpening system but think about what would fit in your system. I’ve been using just minimal water – spray some on for brief work, or put barely enough in the trough to catch the wheel for longer working time. The water is just to control the steel dust. I do not leave the wheel soaking in the water trough.

    If you really bear down on the tool without taking a break, you can build up enough heat at the edge so it is too hot to touch, but I think this is far short of drawing the temper. As a practical matter, heat build up hasn’t been an issue, partly because the work moves along so quickly.

    I admire your courage to sharpen planer knives! Of course, I want to say just get a Shelix cutterhead, you’ll love that too! I do not have experience with sharpening planer knives, but perhaps a little finer grit, say 400 or even 600 might leave the edge in a better state from which to work on the secondary bevel on stones.

    Rob

    Hi Tico,

    My Tormek is vintage 2000. Yes, the bar can bend a bit, but I think you’ll find this is not an issue because you don’t have to put much pressure on the jig and tool when using the CBN wheel – especially the 200. Also, the SE-77 jig is wonderful. See my post on that. It is discussed by Charlesworth and others, rightfully, for its ability to create a controlled amount of camber on plane blades. However, the very same adjustment screws also are used to correct the blade edge’s squareness to to wheel face, and it works beautifully. I’d hold off on the $$$ (overpriced) for a new Tormek. Call or email me and we can talk it through if you want.

    Rob

  4. I enjoy any insight that allows me to expand the tooling that I already own but I am rather mystified as to why you aver that the Tormek OEM wheel is too slow. I want a slow wheel to reliably remove the minimum amount of steel necessary to establish a desired bevel with a zero radius edge. If I wanted fast I would go back to freehand sharpening on a grinding wheel. I understand that turners don’t need the same degree of ‘polish’ on their edges as real woodworkers so again I am confused as to why you are touting this. The advantage of not having to true the wheel seems like a minor advantage as much as the fact that the CBN wheel cannot be retrued is a disadvantage. Perhaps I am too accustomed to waterstones at my advanced age to reconsider methods. The flat of the wheel might have real advantages but you don’t tout that. I look forward to any more commentary on this newly found setup.

  5. 5
    Rob 

    Thanks for the comment.

    If the Tormek OEM wheel meets your needs, great. It’s a matter of personal preference. Some woodworkers don’t like any motorized grinder. I do think many Tormek owners will appreciate the advantages of the CBN wheel as I have discussed.

    I like that the CBN wheel grinds significantly faster than the OEM wheel but not as fast as 1725 or 3450 grinders, which have their own disadvantages. As you know, there is a range of speed among motorized grinders of various sorts with each having advantages and disadvantages.

    The CBN wheel does not need truing or re-truing. It’s good from the start and stays that way.

    Yes, the flat sides of the CBN wheel are handy. I most recently used this feature to quickly correct the bottom of a router plane iron.

    By the way, I do not turn but I consider turners to be real woodworkers.

    Rob

  6. 6
    Ken Rizza 

    First of all- Rob thank-you for writing that article. We have a lot of happy Tormek Style (our Tornado ) wheel users out there. I just wanted to clarify something about the water use. The way Rob is using his is fine but do not leave them running in or sitting in water as the filings will corrode (or worse) the wheel. Make sure the are dry when done or use no water at all. They are constructed of 6061 Aluminum and 70% of the heat goes into the wheel anyway.

  7. 7
    Rob 

    You’re welcome, Ken. Thanks for the tip about the use of water. Now I think I’ll not use the trough at all. I’ll just spritz the wheel with a little water, which is what I’ve been doing most of time anyway – just to help control the steel dust. Or I’ll just use it dry.

    Bottom line, readers, is that the CBN wheel makes work at the Tormek go much faster and easier, without the hassles of the OEM wheel.

    Rob

  8. 8
    Rob 

    I did some more experimenting and found that just two or three light spritzes of water on the wheel is sufficient to keep the steel dust contained. I’m done grinding before this small amount of water evaporates a few minutes later, leaving the stone dry. I will not use water in the trough at all. To emphasize, heat build-up on the tool is not an issue and therefore, that is not the reason I use the water.

    Rob

  9. 9
    Jim Dillon 

    Thanks Rob and Ken for your replies. This sounds really good! Rob, I wouldn’t have started grinding my own knives but my preferred local sharpener went out of business and then I got a deal on a used planer knife jig for the Tormek . . . it is rather tedious, exacting work, involving weighing the knives so they’re within a gram of each other (!!!) but I can do the 3 15″ knives for my planer in about an hour and a half – – – results are excellent. And I agree about the carbide insert cutterhead, the Byrd Shelix is on my wish list! The CBN would fit seamlessly into my sharpening regime, which is simply to grind at 25 degrees once in a very long while, when needed, and hone on waterstones at 30 degrees.

  10. 10
    Rob 

    Sounds good, Jim. I think you have more patience than I do at the sharpening bench.

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