Helix with circular cross-section
fwiw, I made a short length of threaded rod, about a month or two ago,
with left and right hand threads, and matching huts, one lh thread,
t'other rh. (also an attempt at a nut that 'would go both ways). I
showed it to someone I know, but he liked it so much, he put it in his
pocket. This one will be toroidal, too big for a pocket. With sufficient
stiction between the nuts and the rod, if you hold one nut you think you
can tighten the other one against it, but you can't.
On 26/10/2024 18:56, John David via Discuss wrote:
Maybe like the screws that can be tightened turning both left and right?
https://www.youtube.com/watch?app=desktop&v=_48-Ike_i6M
https://www.youtube.com/watch?app=desktop&v=_48-Ike_i6M
That can hurt your noggin, but I get it...
EBo --
Why wouldn't you be able to tighten one nut against another on the helical
threaded rod? It does seem like the nuts would need to have their
threading skewed by the helical curve and angle.
For anyone who wants a simple example of the double threaded screw, there's
one here:
https://github.com/BelfrySCAD/BOSL2/wiki/threading.scad#module-threaded_rod
See Example 7.
On Sun, Oct 27, 2024 at 6:51 AM Raymond West via Discuss <
discuss@lists.openscad.org> wrote:
fwiw, I made a short length of threaded rod, about a month or two ago,
with left and right hand threads, and matching huts, one lh thread,
t'other rh. (also an attempt at a nut that 'would go both ways). I
showed it to someone I know, but he liked it so much, he put it in his
pocket. This one will be toroidal, too big for a pocket. With sufficient
stiction between the nuts and the rod, if you hold one nut you think you
can tighten the other one against it, but you can't.
On 26/10/2024 18:56, John David via Discuss wrote:
Maybe like the screws that can be tightened turning both left and right?
https://www.youtube.com/watch?app=desktop&v=_48-Ike_i6M
https://www.youtube.com/watch?app=desktop&v=_48-Ike_i6M
That can hurt your noggin, but I get it...
EBo --
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To unsubscribe send an email to discuss-leave@lists.openscad.org
Hi Adrian,
if you hold one nut, the stiction can hold the stud, allowing the second
nut to be tightened against the first, but when the second nut touches
the first nut, the stud starts turning in the same direction as the
second nut, thus it can not tighten against the first nut. I've not got
my original, since a friend 'borrowed' it, so that is the best
explanation that I can remember. If you hold the stud, then you can
tighten both nuts together, but swap them over, and turn each in the
same direction, they move apart, of course.
I'm not sure of any practical application, but there are plenty of
double threaded nuts and bolts, but with the threads going in the same
direction. Many occurred when going from imperial to metric threads in
the UK🙁.
Best wishes,
Ray
On 28/10/2024 21:28, Adrian Mariano via Discuss wrote:
Why wouldn't you be able to tighten one nut against another on the
helical threaded rod? It does seem like the nuts would need to have
their threading skewed by the helical curve and angle.
For anyone who wants a simple example of the double threaded screw,
there's one here:
https://github.com/BelfrySCAD/BOSL2/wiki/threading.scad#module-threaded_rod
See Example 7.
On Sun, Oct 27, 2024 at 6:51 AM Raymond West via Discuss
discuss@lists.openscad.org wrote:
fwiw, I made a short length of threaded rod, about a month or two
ago,
with left and right hand threads, and matching huts, one lh thread,
t'other rh. (also an attempt at a nut that 'would go both ways). I
showed it to someone I know, but he liked it so much, he put it in
his
pocket. This one will be toroidal, too big for a pocket. With
sufficient
stiction between the nuts and the rod, if you hold one nut you
think you
can tighten the other one against it, but you can't.
On 26/10/2024 18:56, John David via Discuss wrote:
Maybe like the screws that can be tightened turning both left
and right?
<https://www.youtube.com/watch?app=desktop&v=_48-Ike_i6M>
<https://www.youtube.com/watch?app=desktop&v=_48-Ike_i6M
<https://www.youtube.com/watch?app=desktop&v=_48-Ike_i6M>>
That can hurt your noggin, but I get it...
EBo --
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To unsubscribe send an email to discuss-leave@lists.openscad.org
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To unsubscribe send an email todiscuss-leave@lists.openscad.org
Ray, I think you're talking about the double threaded rod and I
misinterpreted you and thought you were referring to the threaded helix
that you posted. I have printed the double threaded rod (from the above
posted BOSL2 example) and am still in possession of the print, so I know
how that thing behaves.
On Tue, Oct 29, 2024 at 4:14 PM Raymond West via Discuss <
discuss@lists.openscad.org> wrote:
Hi Adrian,
if you hold one nut, the stiction can hold the stud, allowing the second
nut to be tightened against the first, but when the second nut touches the
first nut, the stud starts turning in the same direction as the second nut,
thus it can not tighten against the first nut. I've not got my original,
since a friend 'borrowed' it, so that is the best explanation that I can
remember. If you hold the stud, then you can tighten both nuts together,
but swap them over, and turn each in the same direction, they move apart,
of course.
I'm not sure of any practical application, but there are plenty of double
threaded nuts and bolts, but with the threads going in the same direction.
Many occurred when going from imperial to metric threads in the UK🙁.
Best wishes,
Ray
On 28/10/2024 21:28, Adrian Mariano via Discuss wrote:
Why wouldn't you be able to tighten one nut against another on the helical
threaded rod? It does seem like the nuts would need to have their
threading skewed by the helical curve and angle.
For anyone who wants a simple example of the double threaded screw,
there's one here:
https://github.com/BelfrySCAD/BOSL2/wiki/threading.scad#module-threaded_rod
See Example 7.
On Sun, Oct 27, 2024 at 6:51 AM Raymond West via Discuss <
discuss@lists.openscad.org> wrote:
fwiw, I made a short length of threaded rod, about a month or two ago,
with left and right hand threads, and matching huts, one lh thread,
t'other rh. (also an attempt at a nut that 'would go both ways). I
showed it to someone I know, but he liked it so much, he put it in his
pocket. This one will be toroidal, too big for a pocket. With sufficient
stiction between the nuts and the rod, if you hold one nut you think you
can tighten the other one against it, but you can't.
On 26/10/2024 18:56, John David via Discuss wrote:
Maybe like the screws that can be tightened turning both left and right?
https://www.youtube.com/watch?app=desktop&v=_48-Ike_i6M
https://www.youtube.com/watch?app=desktop&v=_48-Ike_i6M
That can hurt your noggin, but I get it...
EBo --
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org