Results 1 to 5 of 5
  1. #1
    Join Date
    23rd August 2009
    Posts
    6

    Attaching cardboard e-bay to cardboard main tube?

    Hello
    I am interested in construction ideas for fixing a cardboard tube electronics bay to a cardboard main tube. The e-bay is in the typical coupler style with wooden circle ends and a sled. I also need to be able to access the coupler electronics bay from time to time for maintenance, so I can't use a permanent solution, like gluing.
    I have been searching the forums and 2 methods that come up are:
    -friction fit with tape on the coupler ends
    -screws through the main cardboard into the e-bay wood circles
    What sort of other ideas are there for attaching 2 cardboard tubes together?
    Many thanks
    JBerries


  2. #2
    Join Date
    9th May 2009
    Posts
    1,461
    Quote Originally Posted by jberries View Post
    What sort of other ideas are there for attaching 2 cardboard tubes together?
    I use machine screws into T-nuts on the inside of the e-bay coupler. The T-nuts are inserted in small pieces of plywood which are then glued to the coupler.

    Beware of the friction fitting option; I've found it's hard to get it tight enough to not blow the upper tube off at main deployment.


  3. #3
    Join Date
    26th November 2011
    Location
    Waterford, WI
    Posts
    391
    Try removable plastic rivets.
    Jeff Jacobson, KC9VHF
    NAR #92924 L3
    www.wooshrocketry.org NAR Sec. 558

  4. #4
    Join Date
    23rd August 2009
    Posts
    6
    Very good, thanks for the ideas

  5. #5
    Join Date
    18th January 2009
    Location
    Back up in the woods
    Posts
    8,218
    I glued two strips of basswood to the inner wall of my ebay and then just drilled holes (two on each side) through the airframe and ebay wall into them. Then I just screwed in short flathead machine screws to hold it in place. I also glued a thin centering ring into the upper section to act as a stop when I slid the ebay coupler into place.

    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Ebay and links.JPG 
Views:	44 
Size:	124.4 KB 
ID:	69603   Click image for larger version. 

Name:	Ebay retention holes.JPG 
Views:	47 
Size:	318.0 KB 
ID:	69604   Click image for larger version. 

Name:	Ebay stop.JPG 
Views:	38 
Size:	251.9 KB 
ID:	69605   Click image for larger version. 

Name:	Javelin XL -2.jpg 
Views:	43 
Size:	353.8 KB 
ID:	69606   Click image for larger version. 

Name:	Ebay strips.jpg 
Views:	37 
Size:	96.7 KB 
ID:	69607  

    Last edited by MarkII; 25th January 2012 at 08:43 AM.
    Mark S. Kulka NAR 86134 L1, ASTRE 471, Adirondack Mtns., NY
    Opinions Unfettered by Logic • Advice Unsullied by Erudition • Rocketry Without Pity
    In the forest no one can hear you order a grande caffè misto.
    Warning: I brake for invisible squirrels

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •