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  1. #1
    Join Date
    Apr 2011
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    Sydney
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    Default Tipped tool grinder wheels

    G'day all

    I was lucky enough to pickup a GMF 6" tipped tool grinder off gumtree for a measly sum of $140 today. I haven't had a chance to wire a plug on and check it out but I have inspected the wheels and they appear to be your standard peripheral grinding wheels.

    I've browsed the Norton catalogue but can't seem to find any wheels that are suitable to be ground on the side (It looks like the thickest wheel that can be used is 25mm).

    Surely there are others out there with a similiar type of grinder who has had to purchase wheels to suit?

    Cheers
    Jonathan
    Attached Images Attached Images

  2. #2
    Join Date
    Nov 2007
    Location
    melbourne australia
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    3,228

    Default

    Are you sure those wheels can't be used for grinding on their side?

    Good by BTW.

  3. #3
    Join Date
    Apr 2011
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    Sydney
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    Default

    Thanks

    I'm really not sure, thus appearing to be the standard peripheral grinding wheel. I always thought side grinding wheels were recessed or dished?

  4. #4
    Join Date
    Feb 2013
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    Laidley, SE Qld
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    1,038

    Default

    I'm not a grinder expert, but I think that for sharpening carbide tips that grinder would have originally been fitted with diamond laps, it looks like its been downgraded to a standard bench grinder. Top buy.

  5. #5
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
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    6,444

    Default

    Hi Jonathan,

    A green wheel would have been fitted and used for carbide tool tips. I have one for a grinder that I built some time back. 5" inch diameter by 1/4 inch thick, maximum speed 5K rpm. It will whip carbide off the tool like crazy if you are not careful. I must confess that I tend to use CBN wheels nowadays, since I built the drill grinder and discovered just how good CBN is at getting a razor sharp edge on a HSS tool bit.

    PS. It is not a problem grinding on the side of the wheel, just keep your fingers away from it when using it !
    Best Regards:
    Baron J.

  6. #6
    Join Date
    Oct 2004
    Location
    Southern Highlands NSW
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    Default

    What is CBN ?

  7. #7
    BobL is offline Member: Blue and white apron brigade
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    Feb 2006
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    Perth
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    Default

    Cubic Boron Nitride.

    I have a 180 grit CBN wheel, Haven't used the green wheel since I got the CBN. I attached a $10 diamond lapping wheel on the side for TC stuff.

    Using Eccentric Engineering's tool bit holder to hold the bit I run it back and forth a couple of tines across the flat table in front of the wheel and it generates a retouched cutting edge in about 3 passes.

    TP2.jpg

  8. #8
    Join Date
    Nov 2007
    Location
    melbourne australia
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    3,228

    Default

    And I copied Bob!

    I have a side table the same as the OPs, but the guards (now removed) that came with my grinder don't lend themselves to mounting the table.

    The CBN wheel is fantastic. It doesn't seem to heat up HSS as much as traditional wheels do and it doesn't fling abrasive particles all over the workshop. Note mine has a 40mm wide section on the side.
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  9. #9
    Join Date
    Oct 2011
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    Norwood-ish, Adelaide
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    59
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    6,542

    Default

    Where are you guys getting your CBN wheels from? I would not mind one on my drill grinder.

    Michael

  10. #10
    Join Date
    Nov 2007
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    melbourne australia
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    I got mine from Vicmarc for $225. It cost more than the grinder!

    https://vicmarc.com/index.php?option...category_id=20

  11. #11
    Join Date
    Aug 2008
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    near Rockhampton
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    Default

    Quote Originally Posted by jack620 View Post
    It doesn't seem to heat up HSS as much as traditional wheels do and it doesn't fling abrasive particles all over the workshop. Note mine has a 40mm wide section on the side.
    The CBN particles have a higher ability to conduct heat then the steel. So to a certain degree the heat goes into the wheel rather then the work. You would find the wheel actually expands from heat when you are using it.
    Gold, the colour of choice for the discerning person.

  12. #12
    BobL is offline Member: Blue and white apron brigade
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    Perth
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    Quote Originally Posted by .RC. View Post
    The CBN particles have a higher ability to conduct heat then the steel. So to a certain degree the heat goes into the wheel rather then the work. You would find the wheel actually expands from heat when you are using it.
    I posted this in the WWF back in June
    I read somewhere that CBN is 44 times more conductive than conventional al oxide wheels at removing heat.

    On looking up thermalconductivity I found a wide range of values - it's strongly temperature dependent, and alloy and physical form dependent
    At room temperature;
    Steel ranges from 16 W/m șC for SS to ~ 70 W/m șC for some steel alloys.
    Single crystal Al2O3 is around 12 but Porous Al Oxide is only 2.3 W/m șC
    CBN powder is 180 W/m șC while single crystals are 1300 W/m șC
    Interestingly diamond is 2200 W/m șC
    For some applications CBN on Al wheels seem to work and Al ranges from ~60 for MgAl alloy to about 250 for pure Al
    In terms of expansion, a 200 mm diam wheel expands about 2 microns per degree or ~1 um/șC on the radius. Even with prolonged grinding I found it very difficult to get the wheel on average more than say 5 degrees above ambient, probably because rapid turning in air cools it fairly effectively, so expansion is relatively minor unless you are doing precise grinding with fixed tool bit holders etc.

  13. #13
    Join Date
    Apr 2011
    Location
    Sydney
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    99

    Default

    Thanks for all the replies, however I think i haven't been clear enough with my question

    And that is, what model wheels (part number, brand, mfg number) are people using and where are they getting them from?

    I've got CBN wheels on my 8" A&A grinder and they work a treat. I can source 150mm CBN wheels, however they're 40mm wide meaning the tables would need to be hacked or removed - something i'm not prepared to do.

    Surely somebody out there makes a 25mm wide CBN wheel with a side face that can be used to grind on?

  14. #14
    Join Date
    Nov 2010
    Location
    Frankston south
    Posts
    102

    Default

    Can't help with the wheels...........But great score on the grinder, been after one for ages.

  15. #15
    Join Date
    Sep 2012
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    York, North Yorkshire UK
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    Hello Jon,

    I've seen CBN wheels as narrow as 6 mm and as wide as yours, but in every case they are on aluminium hubs ! The CBN being just a few mm thick on the outside edge of the hub. The Diamond laps shown in the pictures are quite thin and are intended to be mounted against a backing plate. To do what I think you are wanting to do, the answer would be a Diamond lap against the side of an existing wheel.

    My CBN wheels are all cone shaped bar one which is cup shaped. The active surface is quite narrow, from 5 mm to 10 mm and about 3 mm thick secured to the alloy hub.

    HTH.
    Best Regards:
    Baron J.

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