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  1. #1
    Join Date
    Aug 2012
    Location
    Greenmount, W.A.
    Age
    70
    Posts
    272

    Default Hercus O Mill Keyway on arbor.

    Finally got my O Mill running. Found running clockwise (looking from front of Mill) was best.
    The arbor is 1" in diameter, and the cutters I have all have a keyway, but the arbor does not. Friction alone stops the cutter from slipping. Seems a bit odd to me! I can't tighten the arbor nut up sufficiently to stop slippage. I don't have a spanner on the arbor proper, only on the nut (at the end). Have I missed something?

  2. #2
    Join Date
    Sep 2012
    Location
    York, North Yorkshire UK
    Posts
    6,440

    Default

    Hi Alan,

    Often there are a pair of spanner flats on the drive end of the arbour !
    Best Regards:
    Baron J.

  3. #3
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    64
    Posts
    4,887

    Default

    Can you hold the nut on the arbor draw bar.
    I would suggest if possible to get a keyway cut into your arbor, friction may work for you but I think you will be limited to very shallow depths of cut.

  4. #4
    Join Date
    Aug 2012
    Location
    Greenmount, W.A.
    Age
    70
    Posts
    272

    Default

    Thanks for the replies. Agreed, the ultimate solution is a keyway. Especially as my physical strength is waining!

  5. #5
    Join Date
    Mar 2012
    Location
    South Australia
    Posts
    33

    Default

    DO NOT machine a key-way on the arbor.

    It is better for the cutters to be held by friction. If the cutter jams it is more likely to spin on the arbor.

    If it is held by a key the cutter will shatter

    Find the flats at both ends and use spanners /shifters to tighten.

  6. #6
    Join Date
    Oct 2001
    Location
    ACT
    Posts
    667

    Default

    the hercus mills are small and generally you can only take light-ish cuts, and generally no need for the keyway as already said

    their is no spindle lock so I tend to engage the back gear - not generally great as there's a risk of back gear damage if you over do it - but you dont put all your weight on the spanner and generally its easy enough to get the arbour done up enough.

    Failing that, You may also be able to make up some kind of C type spanner to engage where one of the square spindle keys are while you have the spanner on the nut at the other end of the arbour.

  7. #7
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    71
    Posts
    6,458

    Default

    AJ,

    I've have used the keyway-less horizontal arbor on my little No.O a fair bit. I tighten the arbor nut by simply locking the back gear. I haven't snapped any gear teeth off.

    If you were concerned about tightness you could hold the arbor in a bench vice by clamping across the arbor's flange drive slots then tighten away to your heart's content. Or you could drill a radial hole in the arbor's flange and use a pin spanner to prevent rotation thereby posing no risk to any gear teeth.

    Hercus Slotting Head - Ram Guide Dec 2009 054.jpg

    BT

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