Altimeter Switches

Discussion in 'High Power Rocketry (HPR)' started by Theory, Oct 8, 2019.

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  1. Oct 11, 2019 #61

    FredA

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    Dave -- yes, but later.
    I'm on the road without a real laptop so I can't make a nice wiring diagram.
    Somewhere there's a thread where I already posted one but I'm not finding it quickly.
    Perhaps somebody with more searching moxy can find it.
     
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  2. Oct 11, 2019 #62

    FMarvinS

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    David,

    Please disregard my last post, I thought your question was directed to me.

    Fred
     
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  3. Oct 12, 2019 #63

    Cl(VII)

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    I got the triple switches added to the web store: https://www.labratrocketry.com/product-page/triple-pull-pin-switch-kit

    Also added extra pull pins to the store while I was at it.

    Mods: I am a registered vendor, but the auto payment I made on the 9th apparently didn't auto renew my access (message in to Angie).

    triple_kit-6131.jpg

    triple_kitRBF-6132.jpg
     
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  4. Oct 13, 2019 #64

    Jozef

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    How do you mount them?
     
  5. Oct 14, 2019 #65

    mpitfield

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    2-56 machine screws fit the mounting holes perfectly. I usually use a flathead countersunk screw. I use a countersunk drill bit that I manually rotate in my hand a dozen times on one side of the switch if mounting on a flat surface.

    Here are three mounted on the bottom of a 3D printed sled for a HED AV bay.

    BFAVBaySled11.jpg

    BFAVBaySled5.jpg
     
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  6. Oct 14, 2019 #66

    Mugs914

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    I really would like to try those switches, but Finger Tech seems to be out of them. Anyone know of any other source?
     
  7. Oct 14, 2019 #67

    mpitfield

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    caraviator likes this.
  8. Oct 14, 2019 #68

    Mugs914

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    "Get sumthin real nice for yourself too, Clark..."

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    Thanks... I tried to do a search but apparently didn't use the right terms,

    Thanks again.
     
  9. Oct 14, 2019 #69

    amiliv

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    I just build my first AV bay using SMT Design Hybrid Bay Kit: https://www.smtdesigns.com/store/54mm-65mm-75mm-hybrid-bay-kits

    It uses momentary slide switches. Both switches are located inside forward bulkhead (not really visible from the photo on that page). To turn them on or off, simply screw in or out the screw. You can see one of the switches on this photo. The screw goes through that metal hole on the side of the bulkhead. The other switch is not visible on the photo (sled is in the way).

    IMG_20191001_215010.jpg
     
  10. Oct 14, 2019 #70

    rharshberger

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    I really like both SMT Designs and Lab Rats products, different switches for different applications, but both vendors make a first class product.
     
  11. Oct 14, 2019 #71

    Jozef

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  12. Oct 15, 2019 #72

    beeblebrox

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  13. Oct 15, 2019 #73

    beeblebrox

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  14. Oct 16, 2019 #74

    JoeG

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    The magnetic switches use one pole of the magnet to turn them on and the other to turn them off. I usually put mine on opposite sides of the e-bay but if your rocket is small in diameter you could turn one on and one off at the same time. Most of my rockets are 4" or larger so I have no problem. On minimum diameter rockets you would want to place the switches at opposite ends or side by side. Putting them side by side will not cause a problem as the same end of the magnet can turn them both on or off at once if you want. Just my experience.
     
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  15. Oct 16, 2019 #75

    GaryT

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    Put together a small Av-Bay this weekend.

    [​IMG]
    [​IMG]
    [​IMG]
     
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  16. Oct 16, 2019 #76

    Cameron Anderson

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    Where are you getting your charge well?
     
  17. Oct 17, 2019 #77

    mpitfield

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    Ahh that there is an original GaryT "BLastCap", great OOP product.
     
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  18. Oct 17, 2019 #78

    GaryT

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    Cameron, Those are my Blastcaps that I designed and used to sell. Sold them for like 5 years but no longer.
     
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  19. Oct 17, 2019 #79

    mpitfield

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    Here is a 54mm MD AV bay. This is 8" long, and you can see one magnetic switch on the left. There is another magnetic switch, in the same spot on the other side, at the other end. From the pic, I am estimating that they are roughly 5-6" apart. This rocket has been launched 14 times, and I have yet to accidentally arm both altimeters at once by energizing both mag switches with one magnet wave.

    20150323_222927_cropped.jpg
     
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  20. Oct 18, 2019 #80

    Voyager1

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    I have used them at opposite ends of the avbay for redundant dual deployment and haven’t had any issues. I might add that I mount them vertically in the same plane as the bulkheads. I find this orientation is more reliable. I have sometimes found that if you swipe the magnet horizontally across the switch it can actually switch on and off in the same motion.
     
    Last edited: Oct 18, 2019

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