COMPLETE Magnetic Latches!

Discussion in 'Guides, Mods, and Upgrades' started by Ephemeris, Jul 22, 2016.

  1. Ephemeris

    Ephemeris Well-Known Member

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    I’ve been babysitting the printer 12 hours a day for weeks to get a work problem done, so I haven’t had much time to design and build anything fun. However, I finally got a few hours free to print my own stuff and decided to take a shot at yet another set of latches.

    The result is a single printable part that can be used for the electronics cover and for the four side panels. No tools are needed to pop the hatches. They snap in and snap out.

    Here’s what they look like installed in the electronics cover. They’re anti-snag, low profile, only 4 mm high.The wide end has a rolled edge to give your fingers just enough purchase to lift the hatch.

    IMG_1520.JPG

    The latch has a recess on the top surface for a 15 mm diameter x 1 mm thick magnet. A little glue in the recess will hold them in place permanently. Here's a typical magnet for this.

    http://www.dx.com/p/fandyfire-15mm-x-1mm-nickel-plated-ndfeb-magnet-100pcs-417837

    You attach the latches to the hatches (that rhymes!) with an M3x12 flathead screw.

    IMG_1528.JPG

    Each latch needs a corresponding magnet mounted to the frame. I found these 12 mm diameter x 3 mm magnets with countersunk holes in the middle that are perfect for an M3x12 flathead screw.

    http://www.dx.com/p/12-x-3-4mm-ndfeb-neodymium-magnet-circular-cylinder-diy-puzzle-set-10-pcs-419002

    As I said these will also work for the four doors on sides of the BigBox. The only difference is, because the side panels lack the threaded brass inserts that hold the electronics cover down, you will also need two M3 nylock (nylon insert) nuts and two M3 washers for each latch.

    IMG_1522.JPG

    So, if you like magnets, and enjoy printing lots of copies of the same thing, this may be the mod for you. Enjoy!
     

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    #1 Ephemeris, Jul 22, 2016
    Last edited: Jul 23, 2016
  2. Stian Indal Haugseth

    Stian Indal Haugseth Well-Known Member

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    Like the design! I thought to use magnets for this as well but only have some 12x3mm magnets. Not sure if it would be easy to adapt your design or make something from scratch :)
     
  3. Sarah Nicholson

    Sarah Nicholson Well-Known Member

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    Hmm... those countersunk magnets are an interesting idea. I'm still thinking about ways to adapt the stock bed to work with the dual direct Titan design. If we could attach something like that to the PCB support pillar...
     
  4. PsyVision

    PsyVision Moderator
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    Off topic: Did the plum couplers make any difference?
     
  5. fpex

    fpex Well-Known Member

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    You read my mind! I wanted to do the very same thing this week end after painting my castle. I guess I can just steal your version and focus on the iron man cover :)
    Thanks for the effort!
     
  6. Ephemeris

    Ephemeris Well-Known Member

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    I really didn't do a comparison in the BB. I've had issues in the past on another printer where a helical coupler gave clearly inferior results to the elastomeric zero-backlash style so now I just use them by default.
     
  7. fpex

    fpex Well-Known Member

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    Could you share a step file of the design? I am finishing a specific mod for my cover and I might want to change the look a little bit.
     
  8. Ephemeris

    Ephemeris Well-Known Member

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    I added the .step file to the original post above. I've never used that export option so I'm curious to see if it works for you.
     
  9. fpex

    fpex Well-Known Member

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    It worked ! Thanks
     
  10. W1EBR.Gene

    W1EBR.Gene Well-Known Member

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    Which one of the plum couplers out there would you recommend?
     
  11. Ephemeris

    Ephemeris Well-Known Member

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    I use the next to smallest Ruland ones that are 1.1" long x 0.75" diameter with the stiffest elastomeric spider.I think these are the right pages:

    http://www.ruland.com/shaft-coupling.php?recordID=MJC19-5-A
    http://www.ruland.com/shaft-coupling.php?recordID=MJC19-8-A
    http://www.ruland.com/shaft-coupling.php?recordID=JD12/19-98R

    They're not cheap, but they are modular, and they can be refurbished. I don't know the cheapest place to get them. McMaster-Carr carries these, so I just get them from there. I'd guess with some searching you could get them for 30% less somewhere.

    Most of the stuff on ebay/amazon are no-name/no-spec stuff that does not inspire confidence.
     
  12. W1EBR.Gene

    W1EBR.Gene Well-Known Member

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    Thanks! I have an account with Mitsumi and I looked there out of curiosity and sure enough, they also carry them.
     
  13. fpex

    fpex Well-Known Member

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    What is a plum coupler?
     
  14. Alex9779

    Alex9779 Moderator
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  15. fpex

    fpex Well-Known Member

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    Ahahah. I deserved it!
    Also because I realise I knew :)
     
    Alex9779 likes this.

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