Free 173 Best Homemade Tools eBook:  
Become a founding member: 500+ tool plans, full site access, and more.

User Tag List

Page 1 of 2 1 2 LastLast
Results 1 to 10 of 15

Thread: Dual-threaded rod - GIF

  1. #1
    Jon
    Jon is offline Jon has agreed the Seller's Terms of Service
    Administrator
    Supporting Member
    Jon's Avatar
    Join Date
    Jan 2012
    Location
    Colorado, USA
    Posts
    20,077
    Thanks
    5,993
    Thanked 27,580 Times in 7,597 Posts

    Dual-threaded rod - GIF

    Dual-threaded rod. Probably not the most practical fastener, and conveniently featured here between both a business and religious advertisement.




    Previously:

    Complex threaded loose nut piece machined from a single part - photo
    80 threads per inch fastener close-up - photo
    Cutting threads with a milling machine - GIF
    Thread rolling cylindrical dies - GIF
    Glass thread forming machine - GIF

    173 Best Homemade Tools eBook
    Last edited by Jon; 12-17-2020 at 05:08 PM.

  2. The Following 4 Users Say Thank You to Jon For This Useful Post:

    baja (08-07-2020), high-side (08-08-2020), Scotty1 (12-19-2020), Tonyg (08-07-2020)

  3. #2
    trigger's Avatar
    Join Date
    Jun 2018
    Posts
    167
    Thanks
    182
    Thanked 46 Times in 31 Posts
    Friggin nice machining!

  4. #3
    Supporting Member Frank S's Avatar
    Join Date
    Aug 2015
    Location
    Peacock TX
    Posts
    6,538
    Thanks
    811
    Thanked 5,103 Times in 2,465 Posts

    Frank S's Tools
    Quote Originally Posted by trigger View Post
    Friggin nice machining!
    Not only that did you happen to notice how many thread starts there are on the thing? it looks to be in the neighborhood of 2 to 4 TPI with possibly 16 to 20 starts in either direction
    Never try to tell me it can't be done
    When I have to paint I use http://kbs.justoldtrucks.com/

  5. #4
    Supporting Member sossol's Avatar
    Join Date
    Oct 2012
    Location
    Lafayette, Indiana
    Posts
    244
    Thanks
    554
    Thanked 254 Times in 110 Posts

    sossol's Tools
    Quote Originally Posted by Frank S View Post
    Not only that did you happen to notice how many thread starts there are on the thing? it looks to be in the neighborhood of 2 to 4 TPI with possibly 16 to 20 starts in either direction
    It looks like the first nut made a 420* rotation and the second went a 360*, so that's <0.5 TPI? At what point do you stop calling them threads and start calling them splines?

    Neil

  6. #5
    Supporting Member IAMSatisfied's Avatar
    Join Date
    Apr 2017
    Location
    The desolate ranch country of Northeastern corner of New Mexico, USA
    Posts
    349
    Thanks
    239
    Thanked 176 Times in 104 Posts
    Quote Originally Posted by sossol View Post
    At what point do you stop calling them threads and start calling them splines?

    Neil
    Or you could call it deep, precision knurling...

  7. #6
    Supporting Member Frank S's Avatar
    Join Date
    Aug 2015
    Location
    Peacock TX
    Posts
    6,538
    Thanks
    811
    Thanked 5,103 Times in 2,465 Posts

    Frank S's Tools
    Quote Originally Posted by sossol View Post
    It looks like the first nut made a 420* rotation and the second went a 360*, so that's <0.5 TPI? At what point do you stop calling them threads and start calling them splines?

    Neil
    Well they would never become splines as splines are generally parallel to the length. so I guess they would be teeth instead of threads as in the teeth of a worm gear but with as many starts as there are on that thing it is probably safe to say no worm gear would ever have that many teeth. Maybe those of the Gleeson Torsion helical pinion gears might come close. I have seen some right angle drives using gears cut with 10 to 12 teeth in a spiral called spiral helix
    SO essentially what the bolt has is a spiral helix thread cut with left and right rotation.
    What ever it is the thing is amazing
    Never try to tell me it can't be done
    When I have to paint I use http://kbs.justoldtrucks.com/

  8. #7
    Supporting Member Frank S's Avatar
    Join Date
    Aug 2015
    Location
    Peacock TX
    Posts
    6,538
    Thanks
    811
    Thanked 5,103 Times in 2,465 Posts

    Frank S's Tools
    Quote Originally Posted by IAMSatisfied View Post
    Or you could call it deep, precision knurling...
    Does look like knurling doesn't it
    Never try to tell me it can't be done
    When I have to paint I use http://kbs.justoldtrucks.com/

  9. #8
    Supporting Member hemmjo's Avatar
    Join Date
    Feb 2017
    Posts
    705
    Thanks
    22
    Thanked 395 Times in 238 Posts

    hemmjo's Tools
    Makes me want to run down stairs and try it, but I don't have a at least a week to devote to it. Sure would be a test of skills!!!

    I am with Frank, 16-20 starts in EACH direction.

    Dual-threaded rod - GIF-trick-bolt.png

  10. #9

    Join Date
    Dec 2017
    Posts
    46
    Thanks
    17
    Thanked 15 Times in 11 Posts
    Quote Originally Posted by trigger View Post
    Friggin nice machining!
    Look at the bottom end of the threads, I'd bet it was done on a CNC due to the thread tool pull out.
    That, or a really fast and skilled machinist.

  11. #10
    Jon
    Jon is offline Jon has agreed the Seller's Terms of Service
    Administrator
    Supporting Member
    Jon's Avatar
    Join Date
    Jan 2012
    Location
    Colorado, USA
    Posts
    20,077
    Thanks
    5,993
    Thanked 27,580 Times in 7,597 Posts
    14:52 video:


  12. The Following 3 Users Say Thank You to Jon For This Useful Post:

    Scotsman Hosie (12-18-2020), Scotty1 (12-19-2020), Tonyg (12-18-2020)

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Bookmarks

Posting Permissions

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