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Hinges / Adjustable Angle Support Connections

Discussion in 'Concepts and Ideas' started by Rick 2.0, May 24, 2018.

  1. Rick 2.0

    Rick 2.0 OpenBuilds Team
    Staff Member Moderator Resident Builder Builder

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    A few weeks ago Mark Carew and MaryD put forth a challenge to several of the resident builders to identify possible uses for the adjustable hinges that have been recently added to the OpenBuilds Parts Store. Here are a few that I've come up with...

    Primarily I like their ability to provide bracing for frames that need to be held square. A good example would be CO2 lasers where even a little bit of flex could misalign the mirrors. The rotational adjustability of the hinges eliminates the need for awkward angle end cuts on the members. They also fit neatly within the framework which is far cleaner than using face plates.

    Frame.jpg IMG_0621.JPG IMG_0622.JPG

    They are also good for when you need odd angles in a framework. The best example of that would be vertices of a sloped front cabinet as shown below. And when the hinge screw is tightened they hold position reasonably well. (Should additional rotational resistance be needed additional suggestions are provided below.)

    Housing - Side.jpg Housing - Open.jpg Housing - Perspective.jpg
    And finally, just some basic thoughts on actually using them as hinges include a folding lap desk, folding legs for a small lightweight camera slider, and self stowing/self locking shop table extension supports.

    Lap Desk.jpg Slider Legs.jpg shop table extensions.jpg

    Modifications: The hinges use an M5 screw which can easily be replaced with a similarly sized star knob or three arm knob with a 20mm exposed thread length. This allows for quick adjustability with no tools. The knobs shown were $1.17 each from Amazon but after I purchased two of the four available, Amazon jacked the price of the remaining two to $11.30 each thus I would suggest any US shoppers consider Zoro instead.

    IMG_0636.JPG IMG_0644.JPG

    Another possible modification involves replacing the screw with a cam clamp quick release. This makes for an extremely rigid joint but with one caveat, the stiffer you make the joint the harder it is to clamp down. Overall though it was very usable if kept in a reasonable range. The cam clamp is actually made for quick release bicycle hubs. And as luck would have it, the tension rod has an M5 thread on it which is threaded up into the steel hinge pin in the clamp. Additional parts required include a 10mm spacer and a 40mm long M5 screw.

    IMG_0647.JPG IMG_0641.JPG IMG_0657.JPG

    Assembly of the system is fairly simple. Start by unscrewing the original shaft from the clamp. It takes a bit of effort as the manufacturer spikes the threads but clamp a pair of vise grips on the shaft and give it a good spin. (Note: you may need to do a bit of rethreading on the nut end to clean up the spiked threads.) Remove the existing screw from the hinge and drill out the existing threads in the back side with a 5mm bit. After you've mounted the hinge pieces on the ends of V-slot (think 25mm screws here), reassemble the hinge adding the 10mm spacer in the middle and run the 40mm bolt in through the back side and into the threaded hole in the hinge pin. Tighten as needed for the rigidity you seek. The purpose of the spacer is to prevent crushing of the cast aluminum hinge prongs. These spacers can also be used with the star knobs above to increase the amount of force applied to the hinge.

    The quick release bicycle skewers are readily available through ebay and a number of other sources. The seller I purchased from is no longer active but this listing appears to be selling units of the same manufacture (no guarantees though).

    Attached below are the Sketchup files for the examples shown above. Please note that these are conceptual concepts only and may not be deadly accurate. If you wish to use them please keep this in mind.

    Anyway, that's all I've got for now. If you have anything thoughts or ideas you'd like to add please feel to do so.
     

    Attached Files:

    MaryD, Mark Carew, Scotty Orr and 2 others like this.
  2. JustinTime

    JustinTime Master
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    How come there is no spacer with the hing? Wouldn't it squish when the screw is tightened?
     
  3. Rick 2.0

    Rick 2.0 OpenBuilds Team
    Staff Member Moderator Resident Builder Builder

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    In most cases you don't need to tighten the screw that much to achieve the necessary friction in the hinge.
     
  4. MaryD

    MaryD OpenBuilds Team
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    Rick, thanks for taking the time. Your insight is really helpful!
     
  5. Mark Carew

    Mark Carew OpenBuilds Team
    Staff Member Moderator Resident Builder Project Maker Builder

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    Great examples! @Rick 2.0 I am sure these will spark some creative future ideas.Thank you for taking the time to share.
     

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