Photoquiz-Endmill Failure
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    Join Date
    Oct 2005
    western washington state
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    Default Photoquiz-Endmill Failure

    The setup
    I ran two identical endmills -3/8 two flute carbide full penetration type. The first was taken to point of failure in mild steel. The second was to finish job and supposedly identical to first. Well after chucking number 2 endmill it chattered, smoked and made debris but did not cut. So I put both in the cutting tool analyzer. The problem became apparent. See if you can identify it.
    Photo note- Images labeled "em" are good endmill taken to point of failure. You will see obvious crystalline fracture of one flute. Images labeled "rg" are supposed regrind carbide endmill but it was unusuable. I think most of you will spot why.

    Note to lazlo- thanks for shareware link. this is definately best geometric program. It may be used realtime on any of the endmill images. You must download first.




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