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Modding Bonding Plexi/acrylic

Discussion in 'Modding' started by Forvak, 4 Jul 2006.

  1. Forvak

    Forvak What's a Dremel?

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    Hey,
    Im woking on a plan for a big mod that involves sticking pieces of acrylic together. I would really like to do it without bolting it all together. The bonds also need to be pretty strong. Ie id like it to support two hard drives and a dvd drive minimum. Also what is the best way to join acrylic to aluminium? Preferably without anything showing on the outside of the acrylic.
    Thanks in advance!
     
  2. Captain Slug

    Captain Slug Infinite Patience

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    IPS Weld-On #3 (Mcmaster part#7528A13) or #4 (Mcmaster part#7517A2).
    It's a plastic solvent made for that family of plastics and will provide a bonded seam with 90% of the strength of the material you are joining.
    You may be able to get ahold of it from a local plastics shop, and you'll need a natural hair paintbrush or a 3cc syringe with a blunt tip in order to apply it. Otherwise you can just order 1-pint tins of it from http://www.mcmaster.com or http://www.usplastics.com

    When applied correctly you will get crystal clear strong joints.

    More information: http://forums.bit-tech.net/showthread.php?t=90412
    and: http://forums.bit-tech.net/showthread.php?t=82332
     
  3. Forvak

    Forvak What's a Dremel?

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    Thanks

    Thanks Captain Slug. That stuff looks great, just what I need for the Acrylic Acrylic joins. Now all I have to do is find something for the Acrylic to metal... :confused:
     
  4. Captain Slug

    Captain Slug Infinite Patience

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    Loctite clear epoxy shouldwork. But it's best not to glue plastics to metal because you won't get a structural bond.
     
  5. Forvak

    Forvak What's a Dremel?

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    What would be the best way to mount the acrylic without having anything show on the outside. Here is a picture of what I am planning to do. Its a little dated so it shows mesh instead of acrylic. Also ignore the EL wire, I'm going for CCFLs
    [​IMG]
     
  6. Klekkus

    Klekkus What's a Dremel?

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    Just glue it with sicaflex ;)
     
  7. Forvak

    Forvak What's a Dremel?

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    Klikka_bZerk: Wow! Talk about choices.... which one of the Sikaflex adhesives should I use for aluminium to acrylic? I looked around and got swamped by the number of different types.

    Hmm, on one of the sites selling Sikaflex they also have this adhesive.
    Plexus MA 300 All Purpose High Strength Adhesive
    http://tinyurl.co.uk/mol9
    Says that it will bond acrylic to aluminium.
     
  8. Smilodon

    Smilodon The Antagonist

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    sicaflex won't give you a strong bond unless you have a large surface.

    it also take ages to dry.

    sicaflex is made to be a flexible adhesive, not a very strong one. i'd go for some sort of epoxy.
     
  9. Nezuji

    Nezuji What's a Dremel?

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    I take it that this is going to be a four-sided pyramid?

    If you arrange for some acrylic or other framework to be beneath the metal "bands", and the sides of each "band" are all welded/glued into one piece, gravity will do almost all the work for you. No structural joins required between metal and acrylic.

    Nezuji :)
     
  10. Forvak

    Forvak What's a Dremel?

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    @Nezuji: Yes, it is going to be four sided... and it is going to be cut in a way that gravity does a lot of the work, but i would still rather have some kind of bond in there.
     
  11. hydro_electric_655

    hydro_electric_655 Dremelly Dude

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    It may just be me but I like the look of countersunk hex head bolts.
     
  12. Smilodon

    Smilodon The Antagonist

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    i guess that would be pretty difficult to do in this case, as the pieces are going together at an angle. not in 90deg.
     
  13. Captain Slug

    Captain Slug Infinite Patience

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    I think you mean socket cap screws. You can't countersink a hex head.
    Socket Cap (also called allen head bolts): [​IMG]
    Hex Head: [​IMG]
    It wouldn't be hard at all to countersink holes at an angle using a power drill and a countersinking bit.
     
  14. hydro_electric_655

    hydro_electric_655 Dremelly Dude

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    At an angle the sureface aea would be larger. As for aluminum you could cut a groove in the acrylic and fold up the alluminum to go itno the joints and then glue it.

    www.mcmaster.com page 2927 Alloy Steel Flat Head—Hex Socket
     
  15. Smilodon

    Smilodon The Antagonist

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    No, but it will look like hell :p

    The heads will not be flush to the surface of the metal, and the screw will just go trough the acrylic at an angle, making it poke trough at one side.
     
  16. Captain Slug

    Captain Slug Infinite Patience

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    Poppycock.
    If you're making this thing in stages you can do all the drilling, tapping, and countersinking with a drillpress. The countersinking itself doesn't have to be supremely accurate on it's own, but the threaded holes will have to be.
     
  17. Smilodon

    Smilodon The Antagonist

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    you obviously don't understand what i mean.

    If you are going to screw together the alu sheet and the plexi sheet as shown in that picture you will have to compromise. Either the countersunk head will not be flush with the surface of the alu sheet, or the threads will go into the plexi at an angle. This will most probably crack when the threads are cut.
     
  18. trati629

    trati629 Can I Fix It? :$ Well Yes??

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    Hi im having a problem getting hold of "isp weld-on 4" in the Uk can any one point me in the right direction or give me a diffrent product that would do the same job as "isp weld-on 4"
     
  19. trati629

    trati629 Can I Fix It? :$ Well Yes??

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    Hi im having a problem getting hold of "isp weld-on 4" in the Uk can any one point me in the right direction or give me a diffrent product that would do the same job as "isp weld-on 4"
     
  20. merlin 65

    merlin 65 What's a Dremel?

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    im not sure if im right , but isnt ips weld like the stuff plumbers use to glue pipes that just brushes on dont know what we call it here though
     

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