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Thread: Hercus O Mill Keyway on arbor.
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8th Jan 2022, 09:12 PM #1Senior Member
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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?
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8th Jan 2022, 09:37 PM #2
Hi Alan,
Often there are a pair of spanner flats on the drive end of the arbour !Best Regards:
Baron J.
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8th Jan 2022, 10:14 PM #3Most Valued Member
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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.
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8th Jan 2022, 10:54 PM #4Senior Member
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Thanks for the replies. Agreed, the ultimate solution is a keyway. Especially as my physical strength is waining!
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9th Jan 2022, 01:29 AM #5Intermediate Member
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- Mar 2012
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- South Australia
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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.
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9th Jan 2022, 10:10 PM #6Golden Member
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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.
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24th Jan 2022, 08:53 PM #7.
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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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