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
Last edited by Jon; Dec 17, 2020 at 05:08 PM.
New plans added on 11/20: Click here for 2,589 plans for homemade tools.
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 directionOriginally Posted by trigger
Never try to tell me it can't be done
When I have to paint I use KBS products
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
Or you could call it deep, precision knurling...
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 KBS products
Does look like knurling doesn't it
Never try to tell me it can't be done
When I have to paint I use KBS products
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.
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.
14:52 video:
New plans added on 11/20: Click here for 2,589 plans for homemade tools.
Scotsman Hosie (Dec 18, 2020), Scotty1 (Dec 19, 2020), Tonyg (Dec 18, 2020)
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