CBN Wheels for chisels and plane blades questions

[Sam Murdoch]

Hi All,

Have been pondering an upgrade to my sharpening system for some time now. Was pretty set to give Ken an order for some CBN wheels and maybe an 8" grinder too. I have a Tormek 2000 which has been taking up space on my bench for years. it has never been a satisfying tool and so I have been left to sharpen all my edge tools on my Shaptons. Getting time to renew some edges beyond basic sharpening though and my bench stones will make this a long project. The Tormek too makes this a tedious process.

SO - I turn to you guys for some advice.

1) In the interest of saving $$s will simply getting a CBN for the Tormek be a huge and useful upgrade? Downsides?

2) Again, in the interest of saving $$s but also bench space - I would be happy to have a 1/2 HP 8" grinder with 2 mounted wheels but will that prove to be a more useful tool up than simply replacing the Tormek wheel?

3) GRITS - If I buy one wheel (square edge) is there a need to go beyond 220? Will that provide a chisel edge that can be tweaked with stropping or will I want more polish off the grinder?

4) If I go with a 2 wheel set up what might you recommend please. 1 for general purpose edge tools like knives and axes (80 grit?) and 1 for the edge tools -180 or 220 or 350? I really have no idea how these compare to other systems in regards to grits.

Thank you for any advice and real world experience.

Sam

[Derek Cohen]

Sam, I went down this path some years ago and wrote about it here: http://www.inthewoodshop.com/Woodwor...ningSetUp.html

It is interesting that CBN wheels have been known to turners for decades, yet a revolution for flat woodworkers. When I discovered them, I moved from a Tormek to a 8” half-speed grinder with 80 and 180 grit CBN wheels, and have not gone back to the Tormek. I would consider a CBN or diamond wheel for the Tormek to be a waste as it remains slow, which is inefficient. I like the way the Tormek holds a blade, both for turning chisels and flat blades, and use this system on the dry grinder.

Going finer than 180 grit, which I consider to be a good all-rounder, is not indicated for chisel/plane grinding since you will still need to go to stones for honing. Lathe chisels are often used off the grinder, and 600 upwards is therefore necessary. Keep in mind that the finer the grit, the greater the heat generated. This is not an issue with the M2 of a lathe chisel, but it is a factor with O1 or similar with bench chisels and plane blades. CBN wheels run pretty cool, but it is still possible to create a lot of heat if you do not make good choices or use good technique.

Ken is a great guy to work with. He gets my recommendation.

Regards from Perth

Derek

[Frederick Skelly]

You can buy a 1/2 hp low speed Rikon grinder for $110 and install a cbn. That's what I did and it's been a great setup. It's fast to reset or change a bevel angle and I finish on my shapton stones. No regrets.
If you want to mount 2 cbn wheels, I think I'd get the 1 hp version for $230. But I havent personally found a need for a second cbn wheel. A single 180 grit wheel works well for me. YMMV.

And after you get the new grinder and cbn, of course you'll want a tormek-style tool holder (BGM100) and maybe a couple accessories you don't already have. At least, that's what happened to me. (Look at Derek's webpage and setup. It was a great help to me.)

Fred

[Sam Murdoch]

Thank you both. Just the kind of recommendations I was hoping to receive. Derek - you expressed exactly my reservation about buying a wheel for the Tormek "I would consider a CBN or diamond wheel for the Tormek to be a waste as it remains slow, which is inefficient."

Thanks too, Frederick. 1 wheel will be how I will start. Yup, and some accessories.

8" is OK, not too much of a hollow in chisels?

Sam

[Phil Mueller]

Sam, I went the 8” slow speed grinder with 180 CBN about a year ago (also from Ken). As others have said, it makes rehabing old irons and changing angles a breeze. Hard to tell scale and I’m afraid it’s a little out of focus, but here’s the hollow on a 1” chisel:

3ADFFA3E-29B4-457B-A641-2C07F23AB632.jpg

[John K Jordan]

Sam,

I've use a 1200 grit CBN wheel (from Ken Rizza) on my Tormek for several years now. It leaves a pretty good finish on my spindle gouges and I love not messing with the water and occasionally truing the wheel. It is fantastic to sharpen an existing tool - only takes a few seconds.

However, it wouldn't be much good for reshaping a bevel. For that I use either a 600 grit CBN on a 1/2 speed grinder or for heavy reshaping, an 80 grit CBN wheel. I also have a 220 grit CBN but with the others I don't even use it any more.

Based on my experience and the way I like my edges, I would definitely not be happy with a 220 grit wheel. My choice for two wheels only would be the 600 and one coarser, 180 or coarser. For axes I prefer a 1" belt sander with 80 grit. For knives I really get picky and use a RealSharp belt-based sharpener, two abrasive belts and a honing/polishing belt - I like that far better than even the fine CBN or water wheel on the Tormek.

If mounting two CBN wheels you might be happier with a 1 hp grinder. Some 1/2" bench grinders are a little wimpy on startup. Rizza offers a 1-hp Rikon grinder with two wheels for a reasonable price.

Too bad you don't have more space! Just to rub it in, this is my sharpening station before I added a second Tormek. The other bench grinders and belt sanders are in my little metal working and welding shop. Maybe a bit over-the-top? Nah.

Sharpening_small.jpg

Too bad you don't live closer - you could try these for yourself. You might talk to Rizza - he may be willing to exchange wheels if you are not satisfied with what you get.

If you want to try a 600 CBN Tormek wheel I have a spare. I used it for a while before deciding I wanted a finer wheel. I could bring it to you but I won't be up your way until Sept.

JKJ

[Sam Murdoch]

John - you make me smile - I would need to add a new shop wing dedicated to grinding and edge maintenance to house your set up. Good for you though. Only over the top if they are mostly idle. Not likely - I'm guessing.

In my little space, I would like to add a Viel S-5-M belt sander for reprofiling knives but still trying to get a good set up for my edge woodworking tools, after all these years and shall remain focused. Thanks for the offer to try a 600 CBN. I'll pass as I think Derek, Fred and Phil, have persuaded me that 180 will be fine enough.

Now I will study my options for grinder/wheels combos.

Thanks for sharing.

Sam

[Rick Kruger]

I have and use a Tormek T8 with a variety grinding wheels, all but one are Tormek. I agree they are slow, but I believe they can give superior results. To improve the speed of creating or reprofiling edges, I use an 80 grit, 1"x 8" Norton 3X grinding wheel (meant for a high speed grinder), fitted with a stainless steel 12mm hub on my Tormek (in the water bath). Works great, speeding things up fairly well. I still want a variable speed Viel belt sander as it would serve that purpose better, but also would have a multitude of other uses in my metal and wood working shops.

I could use another Tormek, so if any of you who are disenchanted with theirs and are willing to sell, I may be interested. If so, please PM me offlist.

Rick

[Derek Cohen]

Rick, the issue with your set up, compared with a CBN wheel, is that you always have to surface the wheel. Plus, because it wears, your settings change. CBN wheels do not wear appreciably - will last decades - and the settings never need to change.

The Tormek is a fine machine, but outdated in comparison to a dry grinder with CBN wheels.

[img]https://i.postimg.cc/859kvKyy/Sharpening-Station1.jpg[/img]


Regards from Perth

Derek

[John K Jordan]

...Tormek. I agree they are slow, but I believe they can give superior results...
I could use another Tormek, so if any of you who are disenchanted with theirs and are willing to sell, I may be interested. If so, please PM me offlist.

I looked for years for a second Tormek, used, since I didn't want to pay the new price. I finally saw one on Classifieds here.

Even with the 1200 grit CBN I still got a better grind on my tools with the Tormek water wheel so I wanted to set one up with the water again mostly for my smallest spindle gouges. The 1200 CBN sure is quicker and less hassle to use, though. I can get the edge as sharp as with the water wheel but it just takes more honing/polishing. BTW, I use Tormek tool supports on my bench grinders so if I want to reshape a tool I can do it quickly on the grinder then move to the Tormek for the finer sharpening. It turns out the difference between the 8" grinder wheels and 10" Tormek wheel is not significant so going from 8" to 10" doesn't take much time.

JKJ

[John K Jordan]

Sam, one thing I forgot to mention: a new CBN wheel cuts much more aggressively than one that is "broken in." Reed Grey once said it took about a month of use until the wheel settles down. (This might be a Reed month!) I think it might be because the electroplating method leaves some sharp grit particles standing up higher than the average and until those are broken off with use a given grit might act like a significantly coarser grit. So if your new wheel seems too coarse maybe use it a while before judging. That's what I did before I decided 600 grit on the Tormek was not fine enough for me.

I do use my sharpening things a lot! I prefer the wheels with square corners instead of the radiused and I also insist on wheels with 1" of grit flat on each side - very useful on occasion, lets me easily grind special-purpose tools like this:

Dovetail_B.jpg

I loves my shop! I cleared a spot by the barn a few years back and built a 24x62' building, room for wood, office, welding, machining, maintenance, electronics, animal care, and more.

But my primary interest is woodturning and teaching woodturning. My lathe "alcove":

WV_boys_IMG_20170319_154641_356.jpg


But now it's getting crowded and I'm planning to add a wing! For example I recently reorganized to put an incubator and hatcher in the shop because the climate control is better for the incubator function. My goal is to hatch peafowl eggs and I'm now raising the first test batch of about 40 chicken eggs in the turning wood storage and maintenance end of the shop.

chicks_incubators.jpg chicks_Kristina.jpg

Besides that, I really want to add a bathroom, shower, and tiny kitchen!

JKJ

John - you make me smile - I would need to add a new shop wing dedicated to grinding and edge maintenance to house your set up. Good for you though. Only over the top if they are mostly idle. Not likely - I'm guessing.

In my little space, I would like to add a Viel S-5-M belt sander for reprofiling knives but still trying to get a good set up for my edge woodworking tools, after all these years and shall remain focused. Thanks for the offer to try a 600 CBN. I'll pass as I think Derek, Fred and Phil, have persuaded me that 180 will be fine enough.

Now I will study my options for grinder/wheels combos.

Thanks for sharing.

Sam

[Sam Murdoch]

John, sounds like you've got great things going on. Me? I am very much into the lessismore phase of life. Still lots of projects and in the biz too.
Still - Je ne suis jamais seul avec ma solitude.

Thanks for the heads up about the break in period with CBNs.

sam

[Derek Cohen]

John, do you do any honing after grinding, or is your grinding your final step? I imagine that you can get away with this on lathe chisels after a 1200 grit CBN wheel.

As a predominantly hand tool user, I have always considered the Tormek as a grinder, and not a sharpener (Tormek view it as a sharpener because of the wheel strop). It is not advisable to end on 1200 grit. I finish on waterstones to 13000 or better. Consequently, when using the Tormek, I would keep the wheel at 220 grit and not re-dress it to 1000. What is the point of 1000 - it just grinds too slowly. 220 is slow as well on the Tormek.

180 grit CBN at speed works quickly and leaves a better surface than the 220 grit Tormek. Even the 80 grit CBN off the bench grinder is pretty good. All will be honed on waterstones, so smoother is unnecessary.

Regards from Perth

Derek

[Rick Kruger]

Derek,

You make the assumption (and I did not specifically state) that the only wheels I have and use are the Tormek matrix grindstones. I have all three grits of the diamond wheels, which do not wear and change diameter, so settings do not change between them. CBN wheels are commonly used on Tormek machines, even in the water bath, with suitable anti-corrosion solution. I don't have any CBN wheels, just the diamond wheels, the two matrix wheels (SG and SB) and the Tormek Japanese waterstone (SJ) wheel, all of these latter wheels do change with truings.

I often prefer the matrix wheels and use them for more routine knife sharpening. For higher end knife steels, the diamond wheels usually produce better results. All of the grindstones can be further refined with the SJ wheel and require little deburring or stropping.

Burr removal is the real key to getting really long lasting sharp edges. Quite a bit of advancement has been made and discussed on the Tormek forum, for any with an open enough mind to take a look.

So, ultimately, with the advent of the Tormek diamond wheels and the ease of use of CBN wheels on Tormek machines, it isn't nearly as outdated as some might think.

Rick

[Rick Kruger]

I also use the Tormek supports and jigs on my 8" Rikon low speed grinder for some of those fast steel removal and reshaping tasks. Works great. I have, but have not set up yet, the same supports on a buffer that will have paper wheels for deburring and polishing using diamond pastes at the 0.5-0.2 micron level. These techniques have been advanced and shared on the Tormek forum, primarily by an outfit in Australia, Knife Grinders.

Rick