3D Printing switch

Discussion in '3-D Printing and Related topics' started by tfish, Mar 13, 2019.

Help Support The Rocketry Forum by donating:

  1. Mar 13, 2019 #1

    tfish

    tfish

    tfish

    Well-Known Member

    Joined:
    Dec 8, 2009
    Messages:
    2,228
    Likes Received:
    174
    I'm not sure how this works...
    a buddy of mine made these simple 3D closures for me. Inside is a surplus military part that has a couple of posts. The 8/32 screw makes contact with the posts and completes the circuit.
    sw1.jpg sw2.jpg

    I've been using the switches for about a year without any issues.
    (thanks JC)

    Tony
     
  2. Mar 13, 2019 #2

    tfish

    tfish

    tfish

    Well-Known Member

    Joined:
    Dec 8, 2009
    Messages:
    2,228
    Likes Received:
    174
    you could do the same sort of thing..either square or round using 90 degree header pins.

    Tony
     
  3. Mar 13, 2019 #3

    cwbullet

    cwbullet

    cwbullet

    Obsessed with Rocketry Staff Member Administrator TRF Lifetime Supporter Global Mod

    Joined:
    Jan 24, 2009
    Messages:
    20,700
    Likes Received:
    811
    Gender:
    Male
    Location:
    Glennville, GA
    Can I see more pictures? I would like to see how the contact is made. I just designed a switch with 2 brass nuts.
     
  4. Mar 14, 2019 #4

    dhbarr

    dhbarr

    dhbarr

    Amateur Professional

    Joined:
    Jan 30, 2016
    Messages:
    4,928
    Likes Received:
    289
    Awesome, I was hoping somebody would make an alternative to the fingertechs!

    I want such tiny ones!
     
  5. Mar 14, 2019 #5

    tfish

    tfish

    tfish

    Well-Known Member

    Joined:
    Dec 8, 2009
    Messages:
    2,228
    Likes Received:
    174
    I got the 'surplus military' pieces from a guy at Balls. They are used as 'initiators". "small 50 gauge nichrom is soldered across the pads and the brass caps are filled with the pyrogen"
    My buddy made the 3D printed holder. An 8/32 screw is used to make the connection between the two pads. The screws are cut to the desired length and then faced to a flat surface.
    I've just been super gluing them in place.
    swparts.jpg


    I was getting tired of paying for switches.

    Tony
     
  6. Mar 14, 2019 #6

    cwbullet

    cwbullet

    cwbullet

    Obsessed with Rocketry Staff Member Administrator TRF Lifetime Supporter Global Mod

    Joined:
    Jan 24, 2009
    Messages:
    20,700
    Likes Received:
    811
    Gender:
    Male
    Location:
    Glennville, GA
    Can take some close up photos?
     
  7. Mar 15, 2019 at 5:43 AM #7

    tfish

    tfish

    tfish

    Well-Known Member

    Joined:
    Dec 8, 2009
    Messages:
    2,228
    Likes Received:
    174
    what close up photos do you want?

    Tony
     
  8. Mar 15, 2019 at 9:35 AM #8

    cwbullet

    cwbullet

    cwbullet

    Obsessed with Rocketry Staff Member Administrator TRF Lifetime Supporter Global Mod

    Joined:
    Jan 24, 2009
    Messages:
    20,700
    Likes Received:
    811
    Gender:
    Male
    Location:
    Glennville, GA
    Tony,

    I think I understand - the screw make the circuit complete in these? I am not sure I see the Nichrome.
     
  9. Mar 15, 2019 at 3:27 PM #9

    tfish

    tfish

    tfish

    Well-Known Member

    Joined:
    Dec 8, 2009
    Messages:
    2,228
    Likes Received:
    174
    There is no nichrome..that description was for what those things were originally meant to do.

    The 8/32 screw makes contact with both the pads...when screwed in.

    Tony
     
  10. Mar 15, 2019 at 4:39 PM #10

    cwbullet

    cwbullet

    cwbullet

    Obsessed with Rocketry Staff Member Administrator TRF Lifetime Supporter Global Mod

    Joined:
    Jan 24, 2009
    Messages:
    20,700
    Likes Received:
    811
    Gender:
    Male
    Location:
    Glennville, GA
    Thanks. The wording confused me.
     

Share This Page