Batten Hinge Design

  • 09 May 2016 17:49
    Reply # 4010149 on 4009778
    Honsec JRA wrote:
    David, your third "here" refers to your private profile view, and should look like this.
    Thanks Roy, now corrected.
  • 09 May 2016 16:12
    Reply # 4009991 on 4006389
    Deleted user

    I also made a video of the hinge in action.  It can be seen in the below link.  

    https://youtu.be/gusYdEuSSz8

    David is pretty generous crediting me for the design as he provided most of the inspiration.  On a materials note, I think polyurethane is a nice material to make it out of because it is cast-able.  That way you only have to turn one hinge on the lathe and the rest can easily be made identical from a mould.  Polyurethane comes in all sorts of hardness and flexibility so you could pretty much tailor your hinge from slightly flexible (I can't really see a benefit to that) to very stiff with glass or other filaments to reinforce it.

  • 09 May 2016 13:39
    Reply # 4009778 on 4009683
    Anonymous
    David Tyler wrote:

    I've uploaded a drawing of Darren's rolling hinge here , and there is a photo of it here.  A drawing of the simplest rocking hinge  is here.

    The subject was gone into in some depth here:

     http://www.junkrigassociation.org/technical_forum/3302473.


    David, your third "here" refers to your private profile view, and should look like this.
  • 09 May 2016 12:37
    Reply # 4009683 on 4006389

    I've uploaded a drawing of Darren's rolling hinge here , and there is a photo of it here.  A drawing of the simplest rocking hinge  is here.

    The subject was gone into in some depth here:

     http://www.junkrigassociation.org/technical_forum/3302473.

    Last modified: 09 May 2016 17:48 | Anonymous member
  • 09 May 2016 12:02
    Reply # 4009640 on 4009333
    David Tyler wrote:Darren has devised a design that has rolling contact in the horizontal plane of articulation, and the usual form of double cone with a cylindrical central flange has rocking contact against the ends of the tubes. 
    I see what you mean. It's like the difference between a train wheel and a sled runner. Do you have a picture or a link for us to view?
  • 09 May 2016 06:49
    Reply # 4009333 on 4008513
    Jim Creighton wrote:

    I I agree, aluminum would probably be a better material. I was thinking plastic at the time because a friend who was dealing in high density plastic design offered to manufacture some test pieces for me. I never did go forward with that because of other priorities at the time. I think too that you had moved on to cambered sails as a better alternative.

    The thing is, that you need a pairing of materials that don't fret and gall against each other, as aluminium to aluminium will. If you use aluminium tubes for battens, you need plastic conical hinges. I don't know of any breakages of plastic hinges - does anyone else?

    Jim, I note that your design of hinge involves a lot of rubbing against the end of the tube, which therefore must be machined very smooth and true, and I wouldn't know how to achieve that without a large centre lathe. I prefer a rolling or rocking form of contact, with the least amount of rubbing, for less wear and tear. Darren has devised a design that has rolling contact in the horizontal plane of articulation, and the usual form of double cone with a cylindrical central flange has rocking contact against the ends of the tubes. Unless there is a major amount of compression in the batten, it doesn't matter too much that the axial contact area is small.

    If I may coin a phrase: rock'n'roll for ever!

  • 09 May 2016 02:31
    Reply # 4009081 on 4006389

    Has our sailing season begun? I wish. We have Summer, Fall, Winter Part ! and Winter Part 2 here. Most of our boats are still on land with their shrink wrap on.

  • 08 May 2016 11:20
    Reply # 4008513 on 4006389

    I I agree, aluminum would probably be a better material. I was thinking plastic at the time because a friend who was dealing in high density plastic design offered to manufacture some test pieces for me. I never did go forward with that because of other priorities at the time. I think too that you had moved on to cambered sails as a better alternative.

  • 07 May 2016 21:39
    Reply # 4008190 on 4006389
    Anonymous member (Administrator)

    Hi Jim

    Wow, that drawing is from 1993  -  even I was using hinges, on and off, in those days. I guess if the hinge part could be machined from aluminium, it should hold well. However, I am sceptical to hinges made of plastic, unless some super modern stuff is used.

    Does your posting mean that the sailing season has started in Halifax??

    Cheers, Arne

     

  • 06 May 2016 14:14
    Message # 4006389

    I recently found a file in my filing cabinet that might be of interest though now maybe just academic interest. See in my album, Miscellaneous Junk Photos.

    Arne we may have had a discussion about this but it was a long time ago.

    I designed a batten hinge using an insert to be made of a yet to be determined material. I wanted a low wear design so I made the centre node to be spherical so that the batten ends would always land on a maximum surface area to avoid hard spots and uneven wearing. Note the pipe ends a slightly chamfered to further spread the load. It could be even more chamfered perhaps.

    Along with the drawing I found correspondence with a supplier of plastics. It read in part:...Needle Spar Ltd. have looked at the drawings and, according to Robin Bliain, were "impressed". They are going to try it out." I never heard anything about it again.

    Cheers, Jim

    Last modified: 06 May 2016 14:23 | Anonymous member
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