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Some questions concerning CBN sharpening

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Forum topic by Jack Lewis posted 07-19-2017 07:23 PM 1042 views 0 times favorited 6 replies Add to Favorites Watch
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Jack Lewis

158 posts in 795 days


07-19-2017 07:23 PM

1. Is there any advantage to a grit finer than an 180 wheel?
2. Should a bowl gouge be sharpened with an 80 grit wheel to leave a burr?
3. If different grit wheels are used , is the final bevel required to be exactly the same as the first grind? My question here is; Can the sharpening jig be adjusted accurately enough when changing wheels?

Come on guys, share your thoughts and experiences.

-- "Now we are getting no where, thanks to me"


6 replies so far

View TheDane's profile

TheDane

5245 posts in 3380 days


#1 posted 07-19-2017 08:35 PM

1. Is there any advantage to a grit finer than an 180 wheel?
Not in my opinion. I have an 80-grit CBN for shaping and 180-grit CBN for sharpening.

2. Should a bowl gouge be sharpened with an 80 grit wheel to leave a burr?
Not necessary. If you put a burr on a bowl gouge, chances are it will get knocked off after a couple of cutting revolutions of the wood. I sharpen my gouges on the 180-grit wheel.

3. If different grit wheels are used , is the final bevel required to be exactly the same as the first grind? My question here is; Can the sharpening jig be adjusted accurately enough when changing wheels?
Not sure I completely understand the question. I use Raptor jigs (from Craft Supplies) on both the 80 and 180 wheels so my grinds are as close to identical as I can get them.

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

View Wildwood's profile

Wildwood

2095 posts in 1851 days


#2 posted 07-20-2017 01:59 PM

If watch D-way video’s says he cannot tell the difference between 80 or 120 grit cbn wheels he sells.

I have been using 80 grit AL wheels to sharpen/ resharpen my tools as long as can remember. Think an 80 grit cbn wheels will serve you well. I don’t worry about the burr like Jerry said only last a secon or two. Not sure where 80 grit falls on cbn wheels but most AL manufacturer classiy 80 grit as fine so would thing same for cbn wheels. My experience with 100 & 120 grit AL wheels took me longer to sharpen and tended to blue my tools.

Benefit of a jig is getting consistenacy at the grinder everytime. Big benefit of cbn wheels they don’t wear like AL oxide wheels so once you get your jig set you are good to go.

-- Bill

View WWhite's profile

WWhite

1 post in 27 days


#3 posted 07-20-2017 03:12 PM

My first post here, and I am certainly no expert regarding anything. I would like to add my experience with CBN wheels, however.

I used to ‘share’ a sharpening system with a friend. When the stone wheel shattered while he was using it, we decided to upgrade to CBN wheels.

I purchased a grinder and CBN wheels from Ken Rizza at Woodturnerswonders.com It was his recommendation that I purchase a 350 grit and 80 grit wheel. I must say I couldn’t be happier. Great product/great vendor.

I have the Raptor jigs and the One Way with the VariGrind. If (and that is a big “if”) I need to reshape a tool, I use the 80 grit wheel. All other sharpening uses the 350 grit wheel, and I can sharpen everything in my limited tool set of 10 tools in 10-15 minutes. As for touching a tool up, doing that on, for example, my large round scraper takes less than a minute on the 350 grit wheel and it is razor sharp.

Again, no expert; just a very satisfied user.

View GordonPrill's profile

GordonPrill

1 post in 314 days


#4 posted 08-12-2017 02:58 AM

My first cbn wheel was a 180 grit. I loved it compared to the AO wheel I was using. After about a year I wanted to see if I could achieve a better edge and save tool steel. I added a 320 grit wheel about 6 months ago and really like it. I get an edge just as sharp with 2 passes, and I feel I’m saving tool steel. I still use the 180 for roughing gouge and others and use the 320 for bowl and spindle gouges.

View Kelly's profile

Kelly

1690 posts in 2661 days


#5 posted 08-12-2017 04:32 AM

I have the 80 and 180 grit wheels. “Generally,” I only use the 80 for roughing in, then I go to the 180. That is so I eat less material than I would using the 80.

I should not that the problem of eating a lot of metal is less a problem for my system than all but a few here because my system is a four wheel pillow block system powered by a DC, variable speed motor, which I seldom crank up over a few hundred RPMs, since faster speeds aren’t necessary.

Essentially, having a finer wheel might be said to be akin to running at my lower speeds – less material removal. Of course, you, also, get a finer edge, which cannot hurt any.

As to the burr, I agree with Gerry, it would be gone after a few turns anyway. Often, I find myself cleaning off the burr, from the inside of the gouge using a diamond edge, to improve the cut. It seems to help me toward better edges.

View Bill7255's profile

Bill7255

398 posts in 2002 days


#6 posted 08-13-2017 12:27 AM

I just have the 180 grit. I bought mine several years ago and at the time I was told to only sharpen HSS or better as it would load up the wheel. Don’t know if that true, but I kept my white wheels for some of my homemade tools. I have the CBN on one side and white wheel on the other side and for shaping I use the 36 white wheel. The CBN wheel will be somewhat aggressive at first, but break in. I haven’t had the need to go to a higher grit.

-- Bill R

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