Unmarked wheel; how to determine if it is CBN or Diamond?
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  1. #1
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    Default Unmarked wheel; how to determine if it is CBN or Diamond?

    I have an unmarked grinding wheel, or the markings have worn off, and I'd like to determine if it is a CBN or Diamond. I mounted it and touched a broken carbide end mill to it and it ground just fine. However, I don't know what would have happened it was CBN, so I consider the test inconclusive.

    The diamond wheels I'm most familiar with tend be be grayish while CBNs tend to be brownish, but not always. The wheel in question is brown on an AL hub.

    Do you guys know of any way to determine what kind of wheel it is?

    Thanks,

    John

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    Colours not a good indicator, i have a lot of brown diamond stuff, some of its got some copper to it as a binder.

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    You can use a magnifying glass to observe the superabrasive on the grinding wheel. The CBN abrasive is darker in color, mostly black, brown, and the diamond abrasive is mostly yellow.

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    IME, CBN won't grind carbide very well at all. My guess is diamond.


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