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  1. 18th October 2017, 05:41 PM #1
    KnifeGrinders's Avatar
    KnifeGrinders
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    Default budget Spartan CBN wheels - first experience

    Got this wheel from Ken Rizza at the US WoodturnesWonders delivered to Australia, for less than the cost of Tormek stock SG wheels:
    Tormek-ready Spartan CBN wheels, all grits.
    https://woodturnerswonders.com/colle...heel-5-8-arbor


    Today had first customer folder ground on this wheel, a Benchmade Osborne S30V - the wheel is all-round perfect – flat, square, and round.
    The best flatness of all CBN wheels I have. Affordability is a true breakthrough.


    The wheel surface is electroplated CBN on steel, and center is made of nylon - the latter drops the cost.
    The Spartan CBN wheel won't be cooling as well on regular bench grinders as its fully aluminum counterparts, but that has no bearing on the low-speed Tormek.


    Challenge with this particular blade was that it came with an uneven bevel out of the box, by 1mm higher at the tip:



    Fixing defects like that is demanding to the flatness of the wheel - the result is pretty good:



    Having ground the bevel on the Spartan CBN #1000 wheel, refined the edge on a sequence of paper wheels from 5 micron diamonds, down to 0.5 micron diamonds.
    Final edge sharpness is 45 BESS, i.e. approx 0.5 micron edge apex width, hair-whittling.


    Can definitely recommend the Spartan CBN wheels.
    Last edited by KnifeGrinders; 18th October 2017 at 07:35 PM. Reason: typo
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  3. 18th October 2017, 06:26 PM #2
    Simplicity's Avatar
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    It is my understanding that CBN wheels need to run slow.
    And heat "can" be a problem, I fail to see how a thin steel rim bonded to a nylon hub would deal sufficiently with the heat build up from grinding.

    We're the solid wheels would to a certain degree, act as a heat sink.

    Cheers Matt



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  4. 18th October 2017, 06:44 PM #3
    Sturdee
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    Quote Originally Posted by Simplicity View Post
    It is my understanding that CBN wheels need to run slow.
    And heat "can" be a problem, I fail to see how a thin steel rim bonded to a nylon hub would deal sufficiently with the heat build up from grinding.

    We're the solid wheels would to a certain degree, act as a heat sink.

    Cheers Matt
    Matt,

    This one is designed for the Tormek grinder which is a very slow speed wet grinder, so the wheel continually rotates through a water reservoir and the wheel remains wet and cool.

    Peter.
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  5. 18th October 2017, 06:51 PM #4
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    Quote Originally Posted by Sturdee View Post
    Matt,

    This one is designed for the Tormek grinder which is a very slow speed wet grinder, so the wheel continually rotates through a water reservoir and the wheel remains wet and cool.

    Peter.
    I humbly stand corrected and hang my head in shame.

    Thanks Peter

    Cheers Matt


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