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Thread: Twist type Reed Switch- how have you done it?

  1. #1

    Default Twist type Reed Switch- how have you done it?

    Hi all,

    I'm looking for a bit of advice on building a reed switch for my mag build.

    I'm pretty happy with all the electronics side, as I'm using a taskled driver, but I'm having a hard time figuring out how to build something to house the magnet, and where the reed goes.

    One idea is to use a ring with a magnet in it around the body of the light. I'm just not sure how to keep it in one place. I don't need the magnet to stay over the reed to keep the torch on, I just want it to not slide up and down the light. Would it make sense to machine a small groove in the maglite body as a locator, but would i be able to get a delrin/plastic ring over the full diameter of the torch to sit in the groove?

    Another member had a ring on the end of the tailcap, any idea how to do that?

    Any other ideas welcome, I just need a mechanism so that I can press or click the light (short and long press) for the taskled functions.

    Cheers

  2. #2
    Flashaholic* DIWdiver's Avatar
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    Default Re: Twist type Reed Switch- how have you done it?

    My first full-custom light had a ring. I turned the ring on the lathe, with a groove in the outside of the ring. Then I cut the ring into two semicircles so it can easily go into the groove on the light, then held in place with an o-ring. The tension of the o-ring provides some friction to keep the ring in place. It actually works pretty well. It does tend to collect sand and get hard to move, but it's easy to clean, even underwater with gloves on.

  3. #3
    Flashaholic* Klem's Avatar
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    Default Re: Twist type Reed Switch- how have you done it?

    Locations for the magnet...The machined ring is a classic solution, but if you don't have access to machining tools/ability you can use a tubular lanyard and sew the magnet in at exactly the right place for when you hold it against the torch. Like this;


  4. #4
    Flashaholic* 350xfire's Avatar
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    Default Re: Twist type Reed Switch- how have you done it?

    Quote Originally Posted by DIWdiver View Post
    My first full-custom light had a ring. I turned the ring on the lathe, with a groove in the outside of the ring. Then I cut the ring into two semicircles so it can easily go into the groove on the light, then held in place with an o-ring. The tension of the o-ring provides some friction to keep the ring in place. It actually works pretty well. It does tend to collect sand and get hard to move, but it's easy to clean, even underwater with gloves on.
    Had not thought about this one! Clever...
    http://tlslights.com/ your source for quality affordable dive lights, Mag-lite conversions and weapon lights. Now a Federal Firearms Dealer.

  5. #5

    Default Re: Twist type Reed Switch- how have you done it?

    you can also design something like this:
    or
    the images are from a german online shop that you can find in the sticky "dive ligthing library" thread.

  6. #6

    Default Re: Twist type Reed Switch- how have you done it?

    Quote Originally Posted by DIWdiver View Post
    My first full-custom light had a ring. I turned the ring on the lathe, with a groove in the outside of the ring. Then I cut the ring into two semicircles so it can easily go into the groove on the light, then held in place with an o-ring. The tension of the o-ring provides some friction to keep the ring in place. It actually works pretty well. It does tend to collect sand and get hard to move, but it's easy to clean, even underwater with gloves on.
    Could you elaborate a bit?

    So the light body has a groove machined around it, right?

    And the ring you also machined up to match the groove, then cut it in half, placed it over the groove, then held it closed with an oring around the outside?

  7. #7

    Default Re: Twist type Reed Switch- how have you done it?

    Quote Originally Posted by dexter9 View Post
    you can also design something like this:
    or
    the images are from a german online shop that you can find in the sticky "dive ligthing library" thread.
    That's a huge sticky, having trouble finding it, can you give me the name or a link?

  8. #8

    Default Re: Twist type Reed Switch- how have you done it?

    alunatec-shop
    not sure if i'm allowed to post links

  9. #9

    Default Re: Twist type Reed Switch- how have you done it?

    Quote Originally Posted by dexter9 View Post
    alunatec-shop
    not sure if i'm allowed to post links
    Found it, thanks.

  10. #10

    Default Re: Twist type Reed Switch- how have you done it?

    My old man had a pretty good idea for it. I'm going to machine a small o-ring groove on the outside of the torch body, and make a ring to sit on the outside. Then make an oring groove on the inside of the ring, and the oring will catch on the groove and keep the ring in place.

  11. #11
    Enlightened Doc Ed's Avatar
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    Default Re: Twist type Reed Switch- how have you done it?

    If you find it hard to slip the ring over the o-ring, you might want to try using a spring and bb instead. Omit the groove in the ring and opt for a small pit where the spring and bb sit. The bb is what travels along the groove on the light. Then you can also put small pits in the light to act as detents for the ring. Of course, the o-ring option is a lot easier I guess, and the friction from the ring will keep it from inadvertently turning on by itself.
    Ed

  12. #12

    Default Re: Twist type Reed Switch- how have you done it?

    Hi,
    I use "PVC plumbing collar" in size 40mm as following pictures show
    The magnet is simply glued with epoxy in the original screw hole (the screw used to fix the collar to a wall).



    No need of lathe... and cost effective (very few € for a pack of 5 collars, i don't know for other states but the size 40mm is available in France in shop like leroy-merlin or castorama).

    It also exist Maglite accesories (with black collar) to fix the mag to a wall or a door. I have glued the magnet on it in a hand grip configuration (look at the fresh thread : Aluminium canister + Mag mod with three SST50)
    Ptit Fred
    Last edited by ptit fred; 06-14-2012 at 06:07 PM.

  13. #13
    Flashaholic* DIWdiver's Avatar
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    Default Re: Twist type Reed Switch- how have you done it?

    Quote Originally Posted by semi View Post
    Could you elaborate a bit?

    So the light body has a groove machined around it, right?

    And the ring you also machined up to match the groove, then cut it in half, placed it over the groove, then held it closed with an oring around the outside?
    Yes, exactly. The ring must be fairly thick in both the axial and radial directions. I cut six large scallops in the outside of the ring so it would be easy to work with thick gloves on.

  14. #14
    Flashaholic* DIWdiver's Avatar
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    Default Re: Twist type Reed Switch- how have you done it?

    Quote Originally Posted by ptit fred View Post
    Hi,
    It also exist Maglite accesories (with black collar) to fix the mag to a wall or a door. I have glued the magnet on it in a hand grip configuration (look at the fresh thread : Aluminium canister + Mag mod with three SST50)
    Ptit Fred
    Wow. That would have saved me a lot of time.

  15. #15
    Flashaholic* DIWdiver's Avatar
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    Default Re: Twist type Reed Switch- how have you done it?

    Quote Originally Posted by semi View Post
    My old man had a pretty good idea for it. I'm going to machine a small o-ring groove on the outside of the torch body, and make a ring to sit on the outside. Then make an oring groove on the inside of the ring, and the oring will catch on the groove and keep the ring in place.
    As Doc Ed alludes to, it seems to me like this would require precise dimensions, which can't be known precisely without experimentation. A little off one way, it's impossible to assemble. A little the other way, it comes apart when you don't want it to. Maybe there's not even a good middle ground at all. It does seem like it should be very resistant to contamination, which is a problem in mine (though it's easy to clean).

    If you do attempt this, please keep us informed about the real-world results. Anything you can add to the knowlege base is good for all!

  16. #16

    Default Re: Twist type Reed Switch- how have you done it?

    That looks like an amazing solution ptit. I'll have a look at some local plumbing suppliers and see if I can find something similar.

  17. #17
    Enlightened
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    Default Re: Twist type Reed Switch- how have you done it?

    some are close to the way i use rotating colars and magnet, without lathe
    i'll post soon some picture

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