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  1. 2nd May 2009, 06:58 PM #1
    Batpig
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    Default Opposing toothed "Clutch-Plate" Nuts? (a bit like "Castle" Nuts...)

    Good Evening All,

    I'm in the process of modifying the Depth-Stop on my old Elu Mitre Saw, and as part of this endeavour I'm looking for a method of positively-engaging the rotational position of a small Shaft that is twisted around by hand.

    The best thing I can think of would employ a couple of opposing toothed Clutch-Plates - one effectively held captive by the machine, and the other mounted on the Shaft in question. Think of a couple of M12 or so "Castle" Nuts, but with radial Saw-type teeth instead of square ones. Two Springs on the Shaft would enable the engagement and disengagement of the two Nuts, but one of the Springs would have to be recessed in between the Nuts in order to push them apart when the Knob on top of the Shaft was pushed down...

    This "recessing" of one of the Springs is why the Clutch-Plates would need to have about the thickness of a Nut to them (I can drill the required recess into them myself...). As for their smallish diameter, this is because of the limited room available around the Shaft in question.

    So - is there a correct name for this particular Beast that I seek...

    Many Thanks,
    Batpig.
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  3. 2nd May 2009, 10:50 PM #2
    Grahame Collins's Avatar
    Grahame Collins
    Grahame Collins is offline Super Moderator
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    Default

    DOG Clutch!
  4. 3rd May 2009, 07:37 AM #3
    Batpig
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    Dear Graham,

    That's it! (Thanks very much...)

    Now, the next question is: Has anyone seen them as a cheap "Off-the-shelf-for-slightly-more-than-the-price-of-a-couple-of-Nuts" type item?

    Blackwoods or Coventry Fasteners would probably be the best place to start I guess...

    Best Wishes,
    Batpig.
  5. 3rd May 2009, 02:13 PM #4
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    Andy Mac
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    I don't know about the actual nut, but maybe this washer setup will allow you to lock the nut better. I have bought similar things from Coventry's Fasteners, and they GRIP!

    Cheers,
    Andy Mac
    Change is inevitable, growth is optional.
  6. 4th May 2009, 10:50 PM #5
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    Gavin Newman
    Gavin Newman is offline SENIOR MEMBER
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    Default

    Sounds like the type of thing found on the handles of the larger mills to keep them from flying around when the table is under power feed.

    If you don't need fine control (ie lots of engagement positions) it should be possible to make your own, a piece of round stock with a slot machined across the top as the female part and a matching part made with the bulk removed to make a corresponding ridge to mesh with the slot on the other part? That gives two engagement positions, if you machine a second slot at 90 degrees to the first that gives 4 positions - would that be enough.
  7. 5th May 2009, 07:55 AM #6
    Batpig
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    Dear Andy and Gavin,

    Have taken both ideas on board. I shoud be going past Coventry Fasteners possibly tomorrow, and I'll see what they've got. If nothing suitable, I'll turn my mind to "Butchery"...

    Many Thanks,
    Batpig.
  8. 5th May 2009, 08:18 PM #7
    Sterob
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    When I made my power feed for my mill, I made a dog clutch. I have a rotary table and a lathe so it was relatively easy. I can dig a pic out if your interested.

    Sterob
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