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Thread: Grinder Mishap, Need a new wheel

  1. #1
    Join Date
    Oct 2013
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    SE Kansas City Metro, MO
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    661

    Grinder Mishap, Need a new wheel

    Had a little mishap with my Woodcraft 8" slow-speed grinder last night, sharpening with the Wolverine and Vari-Grind attachment and lost control of the tool. Gouge (my nearly-new Thompson 5/8" V, dang it) and vari-grind slammed into the wheel and broke a big chunk out of it. Now the wheel is horribly out of balance and basically unusable. Oops.

    So now I need to get a new wheel and am looking for recommendations. Do I drop the big bucks and get one of the new CBN wheels or do I just get another aluminum oxide wheel? What's a good source for a quality aluminum oxide wheel?

  2. #2
    Join Date
    Aug 2013
    Location
    Cumberland, Maryland
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    329
    Marty I have the same grinder and went to a CBN wheel. It really does a fantastic job with very little heat, (with a light touch). I would do it again.
    Another option is that I have the 120 wheel that came with the grinder sitting here doing nothing. If you want it, it's yours for the freight from Maryland.

    Jim

  3. #3
    Join Date
    Nov 2007
    Location
    Fort Pierce, Florida
    Posts
    3,497
    Opening a can of worms are ye?

    Since you state that you are using high vanadium steel (Thompson gouges) I will re-state that my information is that AO wheels can not cut the micro carbides that vanadium forms, but can knock them out of the steel matrix. This means that sharpening with an AO wheel loses you the very characteristic that you paid for when you bought the Thompson gouge.

    Additionally there are cost vs price issues. The CBN wheels ARE higher priced, but should out wear several AO wheels. In addition, they do not need dressing, so no expensive wheel dressers or balancers that would help you get the best out of an AO wheel. So averaged over their lifetime they would cost less. In addition they are wider, so your accident would be less likely - I know because I've been there too.

    Your accident is one of the best reasons not to stick with AO, and by the way throw that wheel away IMMEDIATELY! It almost assuredly has micro-fractures that could cause it to explode and you DON'T want to see what that can do even if you do have the guards in place.

    I have never heard anyone complain that the CBN wheels were not worth the price once they used them. Instead they wonder why they waited so long.
    Retired - when every day is Saturday (unless it's Sunday).

  4. #4
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    Oct 2013
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    SE Kansas City Metro, MO
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    Thanks, Thom. I'll confess that I didn't buy the Thompson gouge for the high-vanadium steel - I bought it because I wanted something better than the Benjamin's Best I started with and it's what most folks here seem to like. But if I can get more out of the gouge with a better wheel, sign me up...


    OptiGrind CBN wheel at Woodcraft is $195 with a bushing. Anyone know whether that wheel is worth the price?

    Looks like D-Way sells a CBN wheel as well, which I'm guessing many here would lean toward.

  5. go with the cbn wheel...........you will get the best results and in time, you will likely upgrade anyway...........look at this mishap as a fortuitous opportunity!
    Remember, in a moments time, everything can change!

    Vision - not just seeing what is, but seeing what can be!




  6. #6
    Join Date
    Dec 2008
    Location
    Cary, NC
    Posts
    513
    Go with the CBN wheel from D-Way. They are worth every penny or dollar. I would take both wheels off your grinder and check it for runout. You want to make sure that the shaft didn't get bent from the catch.
    Joe

  7. #7
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    Oct 2013
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    SE Kansas City Metro, MO
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    Quote Originally Posted by Joe Bradshaw View Post
    I would take both wheels off your grinder and check it for runout. You want to make sure that the shaft didn't get bent from the catch.
    Joe
    Good advice, thanks. I'll check it out this weekend.

  8. #8
    Join Date
    May 2010
    Location
    Ambridge, PA
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    952
    Quote Originally Posted by Thom Sturgill View Post
    Opening a can of worms are ye?I have never heard anyone complain that the CBN wheels were not worth the price once they used them. Instead they wonder why they waited so long.
    Thom,Guess I'm in the camp of "why they waited so long." My hang-up isn't so much the cost (although it does come into play) but more of a decision of getting it right the first time. 1.) Do I keep my present AO wheels + wolverine set-up intact and just add a 2nd grinder with CBN + either adding 2nd wolverine or just take off the existing wolverine and put it on a new grinder + CBN? Certainly much less complicated to just replace the existing wheels with CBN but is there any reason to keep the AO set-up intact for materials you don't want hitting the CBN?2.) Radius edge vs. straight edge. I get to a point where I think the straight edge might be the way to go for me but then think the radius edge would make doing a scraper a bit easier.Right now I use 3 different bowl gouges, a couple different roughing gouges and parting tools and occasionally a couple differently shaped scrapers. All HSS. Care to share any insight without opening the can of worms any further?

  9. #9
    Join Date
    Oct 2013
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    SE Kansas City Metro, MO
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    I placed an order for the D-Way 180 grit CBN wheel, Dave says he'll ship it today so I should have it sometime next week. And it probably won't belong before I go back for the 80 grit CBN wheel...

    I just wish it was as easy to buy skill at the lathe as it is to buy tools for the lathe...

  10. #10
    To start off, I must say that all the CBN wheels I have are from Dave at D-Way, and I've never had a regret.

    lately though, I've learned of a new vendor with outstanding prices. Our turning club (Tri-County Turners, in the Tampa Bay Area) sent out an email referencing this site. I have bought some things from him (sanding pads and an LED lathe lamp), and am very impressed.

    i have no connection with the site or vendor, except as a customer.

    the site is: http://woodturnerswonders.com/collections/all

    Anyway, he has a special, where he will sell both an 80 and 180 grit wheel, both for $249.99. I have heard that they are as good as anything else on the market.

  11. #11
    Join Date
    Nov 2007
    Location
    Fort Pierce, Florida
    Posts
    3,497
    RE flat vs rounded edge
    As I understand it, Dave introduced the rounded edge at David Ellsworth's request. DE taught to round the edge on an AO wheel to grind the little HSS tips used for hollowing. I already had a flat wheel when those came out and can't quite see upgrading.

    Luckily
    1) M2 HSS does not 'need' CBN, AO works fine, and
    2) I have an old 6" grinder with a Norton blue wheel that works fine. I don't need the wolverine for them and have a good (Veritas) after-market platform for the grinder. That wheel is now dedicated to grinding those cutters.
    3) I don't see upgrading the hollower points to Powder Metal as I already have replaceable carbide cutters as a more aggressive alternative.
    Retired - when every day is Saturday (unless it's Sunday).

  12. #12
    My woodturning club recently placed a group order with Woodturners Wonders. Their prices are better than most to start with and we got a quantity discount and a couple of free lights. I'm very happy that I upgraded and wished I had done it sooner.

    http://woodturnerswonders.com/produc...wheel-180-grit

  13. #13
    Join Date
    Oct 2013
    Location
    SE Kansas City Metro, MO
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    661
    I've already ordered the 180 grit wheel from D-Way, but might go ahead and get the 80-grit from Woodturners Wonders. I dont anticipate needing the 80-grit that much but it'd be nice to have CBN on both wheels.

    The most economical plan would be to order the 2-wheel package and re-sell the 180 grit wheel that comes in the package -- if anyone is interested in the 180-grit wheel and splitting the cost (plus a little for shipping), let me know via PM.

  14. #14
    Join Date
    Dec 2005
    Location
    Suwanee (near Atlanta), GA
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    818
    Quote Originally Posted by Greg Just View Post
    My woodturning club recently placed a group order with Woodturners Wonders. Their prices are better than most to start with and we got a quantity discount and a couple of free lights. I'm very happy that I upgraded and wished I had done it sooner.

    http://woodturnerswonders.com/produc...wheel-180-grit
    My club did the same. I already had the 180 grit from Dway and am happy with the 80 grit I got from Ken at Woodturners Wonders.
    God is great and life is good!

  15. #15
    Join Date
    Apr 2009
    Location
    Sonoran Desert, Tucson, AZ
    Posts
    50
    A few months ago I had a SIMILAR experience to Marty's, but my wheel was one of Dave's 180 grit flat CBN wheels. I would really like your input/opinions on this. The "similarity" was a grinding catch - strong enough to bend the tang on my gold Sorby roughing gouge, sending it over my shoulder (no injuries; thank God) BUT the wheel was almost unscathed, leaving a barely perceptible to the naked eye nick/blemish (?) on the wheel itself. The wheel and grinder still runs as true as ever, and still sharpens like nothing ever happened (but did make me a bit uncomfortable every time I turned it on). However, I am safety-conscious almost to a fault, and secretly was looking for an excuse to try D-Way's new radiused CBN... so I bought one a few weeks ago.

    My question is this: has anyone else experienced the same mishap, aka "bairn-frat", and what did you more-experienced turners do with the wheel? Did you think it was still safe to use? ...even as a heavyweight Frisbee? fyi I still have the wheel but my gouge went to the recycle bin. Any info would be most appreciated.
    Will Turn for Coffee

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