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  1. 29th September 2007, 07:22 AM #1
    Stojkov
    Stojkov is offline New Member
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    Default 12 mm router bit in 12.7mm (1/2'') collet?

    I have one spiral cutting bit with 12 mm shank diameter and a router with a ½ collet. Is it safe to use this bit in it? Will it hold it firmly?
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  3. 29th September 2007, 09:41 AM #2
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    lesmeyer
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    I have never tried this, but I am sure that it will NOT be safe to do so. 0.7mm is just too much for a bit spinning at 20 000 rpm. It may feel tight but I am sure that as soon as it is spinning and pressure is applied, it will start to move out of the collet.
    Les
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  4. 29th September 2007, 06:54 PM #3
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    LGS
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    I believe Leigh and I know Festool (since I have one) make a 12mm collet reducer. I would not entertain using a 12mm cutter in a 1/2" collet under any circumstamces but with the adaptor.
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  5. 29th September 2007, 11:31 PM #4
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    specialist
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    but I am sure that it will NOT be safe to do so. 0.7mm is just too much for a bit spinning at 20 000 rpm. It may feel tight but I am sure that as soon as it is spinning and pressure is applied, it will start to move out of the collet.
    I agree, the collet would clamp the top but the bottom of the bit would be floating in the collet and would move around under load.

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  6. 30th September 2007, 07:25 AM #5
    Stojkov
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    Thanks for the answers and good arguments. I won't use it.

    BR
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