Empathy List Archives

SX

Stillpoint X

Wed, Jun 23, 2021 2:37 AM

How can I produce an interrupted (aka non-continuous or discontinuous)
external thread lug finish?

I created a question on stackexchange because I think pictures where needed
and mailing lists don't always work well with images

https://stackoverflow.com/questions/68082569/openscad-creating-lug-bottle-threads?noredirect=1#comment120344827_68082569

How can I produce an interrupted (aka non-continuous or discontinuous)
external thread lug finish?

[image: image 1] https://i.stack.imgur.com/wP17G.jpg

I'm trying to create 3D printed lids for 24oz Mt. Olive pickle jars

[image: image 2] https://i.stack.imgur.com/B8HAk.png

I know about the thread.scad file but how can I create these type of
lugs? The code would generate a 3-start thread in the form of a bolt.

Example 1:

use <threads.scad>;
thread_dia = 27.27;
thread_pitch = 2;
thread_length = 10;
metric_thread(thread_dia, thread_pitch, thread_length, n_starts = 3);

[image: image 1] https://i.stack.imgur.com/hPaa4.png

Example 2 suggestion doesn't seems to work

use <threads.scad>;
thread_dia = 27.27;
thread_pitch = 2;
thread_length = .13;
metric_thread(thread_dia, thread_pitch, thread_length, n_starts = 8);

[image: image 2] https://i.stack.imgur.com/wzqjn.png
https://stackoverflow.com/questions/tagged/3d

--

How can I produce an interrupted (aka non-continuous or discontinuous) external thread lug finish? I created a question on stackexchange because I think pictures where needed and mailing lists don't always work well with images https://stackoverflow.com/questions/68082569/openscad-creating-lug-bottle-threads?noredirect=1#comment120344827_68082569 How can I produce an interrupted (aka non-continuous or discontinuous) external thread lug finish? [image: image 1] <https://i.stack.imgur.com/wP17G.jpg> *I'm trying to create 3D printed lids for 24oz Mt. Olive pickle jars* [image: image 2] <https://i.stack.imgur.com/B8HAk.png> I know about the *thread.scad* file but how can I create these type of lugs? The code would generate a 3-start thread in the form of a bolt. *Example 1:* use <threads.scad>; thread_dia = 27.27; thread_pitch = 2; thread_length = 10; metric_thread(thread_dia, thread_pitch, thread_length, n_starts = 3); [image: image 1] <https://i.stack.imgur.com/hPaa4.png> *Example 2 suggestion doesn't seems to work* use <threads.scad>; thread_dia = 27.27; thread_pitch = 2; thread_length = .13; metric_thread(thread_dia, thread_pitch, thread_length, n_starts = 8); [image: image 2] <https://i.stack.imgur.com/wzqjn.png> <https://stackoverflow.com/questions/tagged/3d> -- -----

GH

Gene Heskett

Wed, Jun 23, 2021 7:53 AM

On Tuesday 22 June 2021 22:37:36 Stillpoint X wrote:

How can I produce an interrupted (aka non-continuous or discontinuous)
external thread lug finish?

I created a question on stackexchange because I think pictures where
needed and mailing lists don't always work well with images

https://stackoverflow.com/questions/68082569/openscad-creating-lug-bot
tle-threads?noredirect=1#comment120344827_68082569

How can I produce an interrupted (aka non-continuous or discontinuous)
external thread lug finish?

[image: image 1] https://i.stack.imgur.com/wP17G.jpg

I'm trying to create 3D printed lids for 24oz Mt. Olive pickle jars

[image: image 2] https://i.stack.imgur.com/B8HAk.png

I know about the thread.scad file but how can I create these type of
lugs? The code would generate a 3-start thread in the form of a bolt.

Example 1:

use <threads.scad>;
thread_dia = 27.27;
thread_pitch = 2;
thread_length = 10;
metric_thread(thread_dia, thread_pitch, thread_length, n_starts = 3);

[image: image 1] https://i.stack.imgur.com/hPaa4.png

Example 2 suggestion doesn't seems to work

use <threads.scad>;
thread_dia = 27.27;
thread_pitch = 2;
thread_length = .13;
metric_thread(thread_dia, thread_pitch, thread_length, n_starts =
8);

[image: image 2] https://i.stack.imgur.com/wzqjn.png
https://stackoverflow.com/questions/tagged/3d

But the jar pix shown at that link aren't 3 start, the top one looks like
an 8 start,the next one maybe 6 start with about 1/8th or 1/6th turn
total. We could do that twist in linuxcnc's g76 but we'ed have to write
a multistart option into G76 to do it. And it would make a requirement
for much higher resolution spindle encoders to do it right. In OpenSCAD,
thats above MY pay grade, but probably easier done given the math talent
on display here. One might be wary of possible patents on the how
though.

Cheers, Gene Heskett

"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.

Louis D. Brandeis
Genes Web page http://geneslinuxbox.net:6309/gene

On Tuesday 22 June 2021 22:37:36 Stillpoint X wrote: > How can I produce an interrupted (aka non-continuous or discontinuous) > external thread lug finish? > > I created a question on stackexchange because I think pictures where > needed and mailing lists don't always work well with images > > https://stackoverflow.com/questions/68082569/openscad-creating-lug-bot >tle-threads?noredirect=1#comment120344827_68082569 > > > How can I produce an interrupted (aka non-continuous or discontinuous) > external thread lug finish? > > [image: image 1] <https://i.stack.imgur.com/wP17G.jpg> > > *I'm trying to create 3D printed lids for 24oz Mt. Olive pickle jars* > > [image: image 2] <https://i.stack.imgur.com/B8HAk.png> > > I know about the *thread.scad* file but how can I create these type of > lugs? The code would generate a 3-start thread in the form of a bolt. > > *Example 1:* > > use <threads.scad>; > thread_dia = 27.27; > thread_pitch = 2; > thread_length = 10; > metric_thread(thread_dia, thread_pitch, thread_length, n_starts = 3); > > [image: image 1] <https://i.stack.imgur.com/hPaa4.png> > > *Example 2 suggestion doesn't seems to work* > > use <threads.scad>; > thread_dia = 27.27; > thread_pitch = 2; > thread_length = .13; > metric_thread(thread_dia, thread_pitch, thread_length, n_starts = > 8); > > [image: image 2] <https://i.stack.imgur.com/wzqjn.png> > <https://stackoverflow.com/questions/tagged/3d> But the jar pix shown at that link aren't 3 start, the top one looks like an 8 start,the next one maybe 6 start with about 1/8th or 1/6th turn total. We could do that twist in linuxcnc's g76 but we'ed have to write a multistart option into G76 to do it. And it would make a requirement for much higher resolution spindle encoders to do it right. In OpenSCAD, thats above MY pay grade, but probably easier done given the math talent on display here. One might be wary of possible patents on the how though. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene>

RW

Ray West

Wed, Jun 23, 2021 11:21 AM

It is an 8 start thread, with a profile designed for moulding in glass.
I think i would start by sort of modelling the actual jar top, then add
some clearance values, and then difference that from the cylinder you
have made for the lid. You will need to print a few test pieces before
you go into mass production. To get something like the thread profile,
I'd probable rotate_extrude a 2d profile then maybe scale it in the x
direction, say, to make it oval, then angle it to match the angle of the
jar thread, and place 8 of 'em around the jar cylinder. The oval shape
would give the lead in for the thread. You will have to extend the
thread a bit, at both ends, else you will not get the lid to screw on.
In fact you won't need the scaling oval thing, just cut the disc/thread
to the correct length (- longer than the thread on the jar).

On 23/06/2021 03:37, Stillpoint X wrote:

How can I produce an interrupted (aka non-continuous or discontinuous)
external thread lug finish?

I created a question on stackexchange because I think pictures where
needed and mailing lists don't always work well with images

https://stackoverflow.com/questions/68082569/openscad-creating-lug-bottle-threads?noredirect=1#comment120344827_68082569
https://stackoverflow.com/questions/68082569/openscad-creating-lug-bottle-threads?noredirect=1#comment120344827_68082569

It is an 8 start thread, with a profile designed for moulding in glass. I think i would start by sort of modelling the actual jar top, then add some clearance values, and then difference that from the cylinder you have made for the lid. You will need to print a few test pieces before you go into mass production. To get something like the thread profile, I'd probable rotate_extrude a 2d profile then maybe scale it in the x direction, say, to make it oval, then angle it to match the angle of the jar thread, and place 8 of 'em around the jar cylinder. The oval shape would give the lead in for the thread. You will have to extend the thread a bit, at both ends, else you will not get the lid to screw on. In fact you won't need the scaling oval thing, just cut the disc/thread to the correct length (- longer than the thread on the jar). On 23/06/2021 03:37, Stillpoint X wrote: > > How can I produce an interrupted (aka non-continuous or discontinuous) > external thread lug finish? > > > I created a question on stackexchange because I think pictures where > needed and mailing lists don't always work well with images > > https://stackoverflow.com/questions/68082569/openscad-creating-lug-bottle-threads?noredirect=1#comment120344827_68082569 > <https://stackoverflow.com/questions/68082569/openscad-creating-lug-bottle-threads?noredirect=1#comment120344827_68082569> > >

D

dpa

Wed, Jun 23, 2021 12:08 PM

as the 3. comment in stackoverflow says: the thread_length is very small.
try
thread_length = 2;

That's the thread only. You need a rounding of the thread ends and a
cylinder/tube ..don't ask me for these details.

Am Mi., 23. Juni 2021 um 13:22 Uhr schrieb Ray West raywest@raywest.com:

It is an 8 start thread, with a profile designed for moulding in glass. I
think i would start by sort of modelling the actual jar top, then add some
clearance values, and then difference that from the cylinder you have made
for the lid. You will need to print a few test pieces before you go into
mass production. To get something like the thread profile, I'd probable
rotate_extrude a 2d profile then maybe scale it in the x direction, say, to
make it oval, then angle it to match the angle of the jar thread, and place
8 of 'em around the jar cylinder. The oval shape would give the lead in for
the thread. You will have to extend the thread a bit, at both ends, else
you will not get the lid to screw on. In fact you won't need the scaling
oval thing, just cut the disc/thread to the correct length (- longer than
the thread on the jar).
On 23/06/2021 03:37, Stillpoint X wrote:

How can I produce an interrupted (aka non-continuous or discontinuous)
external thread lug finish?

I created a question on stackexchange because I think pictures where
needed and mailing lists don't always work well with images

https://stackoverflow.com/questions/68082569/openscad-creating-lug-bottle-threads?noredirect=1#comment120344827_68082569

OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org

as the 3. comment in stackoverflow says: the thread_length is very small. try thread_length = 2; That's the thread only. You need a rounding of the thread ends and a cylinder/tube ..don't ask me for these details. Am Mi., 23. Juni 2021 um 13:22 Uhr schrieb Ray West <raywest@raywest.com>: > It is an 8 start thread, with a profile designed for moulding in glass. I > think i would start by sort of modelling the actual jar top, then add some > clearance values, and then difference that from the cylinder you have made > for the lid. You will need to print a few test pieces before you go into > mass production. To get something like the thread profile, I'd probable > rotate_extrude a 2d profile then maybe scale it in the x direction, say, to > make it oval, then angle it to match the angle of the jar thread, and place > 8 of 'em around the jar cylinder. The oval shape would give the lead in for > the thread. You will have to extend the thread a bit, at both ends, else > you will not get the lid to screw on. In fact you won't need the scaling > oval thing, just cut the disc/thread to the correct length (- longer than > the thread on the jar). > On 23/06/2021 03:37, Stillpoint X wrote: > > How can I produce an interrupted (aka non-continuous or discontinuous) > external thread lug finish? > > I created a question on stackexchange because I think pictures where > needed and mailing lists don't always work well with images > > > https://stackoverflow.com/questions/68082569/openscad-creating-lug-bottle-threads?noredirect=1#comment120344827_68082569 > > > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org >

AM

Adrian Mariano

Wed, Jun 23, 2021 12:54 PM

Do the threads in BOSL2 do what's needed here?

https://github.com/revarbat/BOSL2/wiki/bottlecaps.scad

Supports PCO-1810 and PCO-1881.

On Wed, Jun 23, 2021 at 8:09 AM dpa sc@pankd.de wrote:

as the 3. comment in stackoverflow says: the thread_length is very small.
try
thread_length = 2;

That's the thread only. You need a rounding of the thread ends and a
cylinder/tube ..don't ask me for these details.

Am Mi., 23. Juni 2021 um 13:22 Uhr schrieb Ray West raywest@raywest.com:

It is an 8 start thread, with a profile designed for moulding in glass. I
think i would start by sort of modelling the actual jar top, then add some
clearance values, and then difference that from the cylinder you have made
for the lid. You will need to print a few test pieces before you go into
mass production. To get something like the thread profile, I'd probable
rotate_extrude a 2d profile then maybe scale it in the x direction, say, to
make it oval, then angle it to match the angle of the jar thread, and place
8 of 'em around the jar cylinder. The oval shape would give the lead in for
the thread. You will have to extend the thread a bit, at both ends, else
you will not get the lid to screw on. In fact you won't need the scaling
oval thing, just cut the disc/thread to the correct length (- longer than
the thread on the jar).
On 23/06/2021 03:37, Stillpoint X wrote:

How can I produce an interrupted (aka non-continuous or discontinuous)
external thread lug finish?

I created a question on stackexchange because I think pictures where
needed and mailing lists don't always work well with images

https://stackoverflow.com/questions/68082569/openscad-creating-lug-bottle-threads?noredirect=1#comment120344827_68082569

OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org

Do the threads in BOSL2 do what's needed here? https://github.com/revarbat/BOSL2/wiki/bottlecaps.scad Supports PCO-1810 and PCO-1881. On Wed, Jun 23, 2021 at 8:09 AM dpa <sc@pankd.de> wrote: > as the 3. comment in stackoverflow says: the thread_length is very small. > try > thread_length = 2; > > That's the thread only. You need a rounding of the thread ends and a > cylinder/tube ..don't ask me for these details. > > Am Mi., 23. Juni 2021 um 13:22 Uhr schrieb Ray West <raywest@raywest.com>: > >> It is an 8 start thread, with a profile designed for moulding in glass. I >> think i would start by sort of modelling the actual jar top, then add some >> clearance values, and then difference that from the cylinder you have made >> for the lid. You will need to print a few test pieces before you go into >> mass production. To get something like the thread profile, I'd probable >> rotate_extrude a 2d profile then maybe scale it in the x direction, say, to >> make it oval, then angle it to match the angle of the jar thread, and place >> 8 of 'em around the jar cylinder. The oval shape would give the lead in for >> the thread. You will have to extend the thread a bit, at both ends, else >> you will not get the lid to screw on. In fact you won't need the scaling >> oval thing, just cut the disc/thread to the correct length (- longer than >> the thread on the jar). >> On 23/06/2021 03:37, Stillpoint X wrote: >> >> How can I produce an interrupted (aka non-continuous or discontinuous) >> external thread lug finish? >> >> I created a question on stackexchange because I think pictures where >> needed and mailing lists don't always work well with images >> >> >> https://stackoverflow.com/questions/68082569/openscad-creating-lug-bottle-threads?noredirect=1#comment120344827_68082569 >> >> >> _______________________________________________ >> 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 >

SX

Stillpoint X

Wed, Jun 23, 2021 6:18 PM

I'm not sure if the threads in BOSL2 will do it. I couldn't find an example
that created the LUG pitch. If you know of an example please let me know.

Thanks

On Wed, Jun 23, 2021 at 8:55 AM Adrian Mariano avm4@cornell.edu wrote:

Do the threads in BOSL2 do what's needed here?

https://github.com/revarbat/BOSL2/wiki/bottlecaps.scad

Supports PCO-1810 and PCO-1881.

On Wed, Jun 23, 2021 at 8:09 AM dpa sc@pankd.de wrote:

as the 3. comment in stackoverflow says: the thread_length is very small.
try
thread_length = 2;

That's the thread only. You need a rounding of the thread ends and a
cylinder/tube ..don't ask me for these details.

Am Mi., 23. Juni 2021 um 13:22 Uhr schrieb Ray West <raywest@raywest.com

:

It is an 8 start thread, with a profile designed for moulding in glass.
I think i would start by sort of modelling the actual jar top, then add
some clearance values, and then difference that from the cylinder you have
made for the lid. You will need to print a few test pieces before you go
into mass production. To get something like the thread profile, I'd
probable rotate_extrude a 2d profile then maybe scale it in the x
direction, say, to make it oval, then angle it to match the angle of the
jar thread, and place 8 of 'em around the jar cylinder. The oval shape
would give the lead in for the thread. You will have to extend the thread a
bit, at both ends, else you will not get the lid to screw on. In fact you
won't need the scaling oval thing, just cut the disc/thread to the correct
length (- longer than the thread on the jar).
On 23/06/2021 03:37, Stillpoint X wrote:

How can I produce an interrupted (aka non-continuous or discontinuous)
external thread lug finish?

I created a question on stackexchange because I think pictures where
needed and mailing lists don't always work well with images

https://stackoverflow.com/questions/68082569/openscad-creating-lug-bottle-threads?noredirect=1#comment120344827_68082569

OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org

--

I'm not sure if the threads in BOSL2 will do it. I couldn't find an example that created the LUG pitch. If you know of an example please let me know. Thanks On Wed, Jun 23, 2021 at 8:55 AM Adrian Mariano <avm4@cornell.edu> wrote: > Do the threads in BOSL2 do what's needed here? > > https://github.com/revarbat/BOSL2/wiki/bottlecaps.scad > > Supports PCO-1810 and PCO-1881. > > On Wed, Jun 23, 2021 at 8:09 AM dpa <sc@pankd.de> wrote: > >> as the 3. comment in stackoverflow says: the thread_length is very small. >> try >> thread_length = 2; >> >> That's the thread only. You need a rounding of the thread ends and a >> cylinder/tube ..don't ask me for these details. >> >> Am Mi., 23. Juni 2021 um 13:22 Uhr schrieb Ray West <raywest@raywest.com >> >: >> >>> It is an 8 start thread, with a profile designed for moulding in glass. >>> I think i would start by sort of modelling the actual jar top, then add >>> some clearance values, and then difference that from the cylinder you have >>> made for the lid. You will need to print a few test pieces before you go >>> into mass production. To get something like the thread profile, I'd >>> probable rotate_extrude a 2d profile then maybe scale it in the x >>> direction, say, to make it oval, then angle it to match the angle of the >>> jar thread, and place 8 of 'em around the jar cylinder. The oval shape >>> would give the lead in for the thread. You will have to extend the thread a >>> bit, at both ends, else you will not get the lid to screw on. In fact you >>> won't need the scaling oval thing, just cut the disc/thread to the correct >>> length (- longer than the thread on the jar). >>> On 23/06/2021 03:37, Stillpoint X wrote: >>> >>> How can I produce an interrupted (aka non-continuous or discontinuous) >>> external thread lug finish? >>> >>> I created a question on stackexchange because I think pictures where >>> needed and mailing lists don't always work well with images >>> >>> >>> https://stackoverflow.com/questions/68082569/openscad-creating-lug-bottle-threads?noredirect=1#comment120344827_68082569 >>> >>> >>> _______________________________________________ >>> 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 > --

D

dpa

Wed, Jun 23, 2021 9:38 PM

BOSL2 can do it for sure.
https://github.com/revarbat/BOSL2/wiki/threading.scad

but his script seems to work too. He just set the height to 0.13 .. and
wonders why it looks like a disk.

Am Mi., 23. Juni 2021 um 20:19 Uhr schrieb Stillpoint X <
stillpointx@gmail.com>:

I'm not sure if the threads in BOSL2 will do it. I couldn't find an
example that created the LUG pitch. If you know of an example please let me
know.

Thanks

On Wed, Jun 23, 2021 at 8:55 AM Adrian Mariano avm4@cornell.edu wrote:

Do the threads in BOSL2 do what's needed here?

https://github.com/revarbat/BOSL2/wiki/bottlecaps.scad

Supports PCO-1810 and PCO-1881.

On Wed, Jun 23, 2021 at 8:09 AM dpa sc@pankd.de wrote:

as the 3. comment in stackoverflow says: the thread_length is very
small.
try
thread_length = 2;

That's the thread only. You need a rounding of the thread ends and a
cylinder/tube ..don't ask me for these details.

Am Mi., 23. Juni 2021 um 13:22 Uhr schrieb Ray West <raywest@raywest.com

:

It is an 8 start thread, with a profile designed for moulding in glass.
I think i would start by sort of modelling the actual jar top, then add
some clearance values, and then difference that from the cylinder you have
made for the lid. You will need to print a few test pieces before you go
into mass production. To get something like the thread profile, I'd
probable rotate_extrude a 2d profile then maybe scale it in the x
direction, say, to make it oval, then angle it to match the angle of the
jar thread, and place 8 of 'em around the jar cylinder. The oval shape
would give the lead in for the thread. You will have to extend the thread a
bit, at both ends, else you will not get the lid to screw on. In fact you
won't need the scaling oval thing, just cut the disc/thread to the correct
length (- longer than the thread on the jar).
On 23/06/2021 03:37, Stillpoint X wrote:

How can I produce an interrupted (aka non-continuous or discontinuous)
external thread lug finish?

I created a question on stackexchange because I think pictures where
needed and mailing lists don't always work well with images

https://stackoverflow.com/questions/68082569/openscad-creating-lug-bottle-threads?noredirect=1#comment120344827_68082569

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

BOSL2 can do it for sure. https://github.com/revarbat/BOSL2/wiki/threading.scad but his script seems to work too. He just set the height to 0.13 .. and wonders why it looks like a disk. Am Mi., 23. Juni 2021 um 20:19 Uhr schrieb Stillpoint X < stillpointx@gmail.com>: > I'm not sure if the threads in BOSL2 will do it. I couldn't find an > example that created the LUG pitch. If you know of an example please let me > know. > > Thanks > > On Wed, Jun 23, 2021 at 8:55 AM Adrian Mariano <avm4@cornell.edu> wrote: > >> Do the threads in BOSL2 do what's needed here? >> >> https://github.com/revarbat/BOSL2/wiki/bottlecaps.scad >> >> Supports PCO-1810 and PCO-1881. >> >> On Wed, Jun 23, 2021 at 8:09 AM dpa <sc@pankd.de> wrote: >> >>> as the 3. comment in stackoverflow says: the thread_length is very >>> small. >>> try >>> thread_length = 2; >>> >>> That's the thread only. You need a rounding of the thread ends and a >>> cylinder/tube ..don't ask me for these details. >>> >>> Am Mi., 23. Juni 2021 um 13:22 Uhr schrieb Ray West <raywest@raywest.com >>> >: >>> >>>> It is an 8 start thread, with a profile designed for moulding in glass. >>>> I think i would start by sort of modelling the actual jar top, then add >>>> some clearance values, and then difference that from the cylinder you have >>>> made for the lid. You will need to print a few test pieces before you go >>>> into mass production. To get something like the thread profile, I'd >>>> probable rotate_extrude a 2d profile then maybe scale it in the x >>>> direction, say, to make it oval, then angle it to match the angle of the >>>> jar thread, and place 8 of 'em around the jar cylinder. The oval shape >>>> would give the lead in for the thread. You will have to extend the thread a >>>> bit, at both ends, else you will not get the lid to screw on. In fact you >>>> won't need the scaling oval thing, just cut the disc/thread to the correct >>>> length (- longer than the thread on the jar). >>>> On 23/06/2021 03:37, Stillpoint X wrote: >>>> >>>> How can I produce an interrupted (aka non-continuous or discontinuous) >>>> external thread lug finish? >>>> >>>> I created a question on stackexchange because I think pictures where >>>> needed and mailing lists don't always work well with images >>>> >>>> >>>> https://stackoverflow.com/questions/68082569/openscad-creating-lug-bottle-threads?noredirect=1#comment120344827_68082569 >>>> >>>> >>>> _______________________________________________ >>>> 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 >> > > > -- > > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org >

RD

Revar Desmera

Thu, Jun 24, 2021 1:12 AM

I tweaked thread_helix() in BOSL2 to allow a starts= argument, so now you can do something like:

include <BOSL2/std.scad>
include <BOSL2/threading.scad>
thread_helix(d=50, pitch=8, thread_depth=2, thread_angle=30, starts=8, twist=45, higbee=3, $fn=72);

Revar

On Jun 23, 2021, at 2:38 PM, dpa sc@pankd.de wrote:

BOSL2 can do it for sure.
https://github.com/revarbat/BOSL2/wiki/threading.scad https://github.com/revarbat/BOSL2/wiki/threading.scad

but his script seems to work too. He just set the height to 0.13 .. and wonders why it looks like a disk.

Am Mi., 23. Juni 2021 um 20:19 Uhr schrieb Stillpoint X <stillpointx@gmail.com mailto:stillpointx@gmail.com>:
I'm not sure if the threads in BOSL2 will do it. I couldn't find an example that created the LUG pitch. If you know of an example please let me know.

Thanks

On Wed, Jun 23, 2021 at 8:55 AM Adrian Mariano <avm4@cornell.edu mailto:avm4@cornell.edu> wrote:
Do the threads in BOSL2 do what's needed here?

https://github.com/revarbat/BOSL2/wiki/bottlecaps.scad https://github.com/revarbat/BOSL2/wiki/bottlecaps.scad

Supports PCO-1810 and PCO-1881.

On Wed, Jun 23, 2021 at 8:09 AM dpa <sc@pankd.de mailto:sc@pankd.de> wrote:
as the 3. comment in stackoverflow says: the thread_length is very small.
try
thread_length = 2;

That's the thread only. You need a rounding of the thread ends and a cylinder/tube ..don't ask me for these details.

Am Mi., 23. Juni 2021 um 13:22 Uhr schrieb Ray West <raywest@raywest.com mailto:raywest@raywest.com>:
It is an 8 start thread, with a profile designed for moulding in glass. I think i would start by sort of modelling the actual jar top, then add some clearance values, and then difference that from the cylinder you have made for the lid. You will need to print a few test pieces before you go into mass production. To get something like the thread profile, I'd probable rotate_extrude a 2d profile then maybe scale it in the x direction, say, to make it oval, then angle it to match the angle of the jar thread, and place 8 of 'em around the jar cylinder. The oval shape would give the lead in for the thread. You will have to extend the thread a bit, at both ends, else you will not get the lid to screw on. In fact you won't need the scaling oval thing, just cut the disc/thread to the correct length (- longer than the thread on the jar).

On 23/06/2021 03:37, Stillpoint X wrote:

How can I produce an interrupted (aka non-continuous or discontinuous) external thread lug finish?

I created a question on stackexchange because I think pictures where needed and mailing lists don't always work well with images

https://stackoverflow.com/questions/68082569/openscad-creating-lug-bottle-threads?noredirect=1#comment120344827_68082569 https://stackoverflow.com/questions/68082569/openscad-creating-lug-bottle-threads?noredirect=1#comment120344827_68082569

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I tweaked thread_helix() in BOSL2 to allow a starts= argument, so now you can do something like: include <BOSL2/std.scad> include <BOSL2/threading.scad> thread_helix(d=50, pitch=8, thread_depth=2, thread_angle=30, starts=8, twist=45, higbee=3, $fn=72); - Revar > On Jun 23, 2021, at 2:38 PM, dpa <sc@pankd.de> wrote: > > BOSL2 can do it for sure. > https://github.com/revarbat/BOSL2/wiki/threading.scad <https://github.com/revarbat/BOSL2/wiki/threading.scad> > > but his script seems to work too. He just set the height to 0.13 .. and wonders why it looks like a disk. > > Am Mi., 23. Juni 2021 um 20:19 Uhr schrieb Stillpoint X <stillpointx@gmail.com <mailto:stillpointx@gmail.com>>: > I'm not sure if the threads in BOSL2 will do it. I couldn't find an example that created the LUG pitch. If you know of an example please let me know. > > Thanks > > On Wed, Jun 23, 2021 at 8:55 AM Adrian Mariano <avm4@cornell.edu <mailto:avm4@cornell.edu>> wrote: > Do the threads in BOSL2 do what's needed here? > > https://github.com/revarbat/BOSL2/wiki/bottlecaps.scad <https://github.com/revarbat/BOSL2/wiki/bottlecaps.scad> > > Supports PCO-1810 and PCO-1881. > > On Wed, Jun 23, 2021 at 8:09 AM dpa <sc@pankd.de <mailto:sc@pankd.de>> wrote: > as the 3. comment in stackoverflow says: the thread_length is very small. > try > thread_length = 2; > > That's the thread only. You need a rounding of the thread ends and a cylinder/tube ..don't ask me for these details. > > Am Mi., 23. Juni 2021 um 13:22 Uhr schrieb Ray West <raywest@raywest.com <mailto:raywest@raywest.com>>: > It is an 8 start thread, with a profile designed for moulding in glass. I think i would start by sort of modelling the actual jar top, then add some clearance values, and then difference that from the cylinder you have made for the lid. You will need to print a few test pieces before you go into mass production. To get something like the thread profile, I'd probable rotate_extrude a 2d profile then maybe scale it in the x direction, say, to make it oval, then angle it to match the angle of the jar thread, and place 8 of 'em around the jar cylinder. The oval shape would give the lead in for the thread. You will have to extend the thread a bit, at both ends, else you will not get the lid to screw on. In fact you won't need the scaling oval thing, just cut the disc/thread to the correct length (- longer than the thread on the jar). > > On 23/06/2021 03:37, Stillpoint X wrote: >> How can I produce an interrupted (aka non-continuous or discontinuous) external thread lug finish? >> >> >> I created a question on stackexchange because I think pictures where needed and mailing lists don't always work well with images >> >> https://stackoverflow.com/questions/68082569/openscad-creating-lug-bottle-threads?noredirect=1#comment120344827_68082569 <https://stackoverflow.com/questions/68082569/openscad-creating-lug-bottle-threads?noredirect=1#comment120344827_68082569> >> >> > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org <mailto:discuss-leave@lists.openscad.org> > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org <mailto:discuss-leave@lists.openscad.org> > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org <mailto:discuss-leave@lists.openscad.org> > > > -- > > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org <mailto:discuss-leave@lists.openscad.org> > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org

J

jon

Thu, Jun 24, 2021 1:22 AM

What a responsive community we have! Makes me smile!

Jon

On 6/23/2021 9:12 PM, Revar Desmera wrote:

I tweaked thread_helix() in BOSL2 to allow a starts= argument, so now
you can do something like:

 include <BOSL2/std.scad>
 include <BOSL2/threading.scad>
 thread_helix(d=50, pitch=8, thread_depth=2, thread_angle=30,
 starts=8, twist=45, higbee=3, $fn=72);

Revar

What a responsive community we have! Makes me smile! Jon On 6/23/2021 9:12 PM, Revar Desmera wrote: > I tweaked thread_helix() in BOSL2 to allow a starts= argument, so now > you can do something like: > > include <BOSL2/std.scad> > include <BOSL2/threading.scad> > thread_helix(d=50, pitch=8, thread_depth=2, thread_angle=30, > starts=8, twist=45, higbee=3, $fn=72); > > > > > - Revar > >

SX

Stillpoint X

Thu, Jun 24, 2021 7:03 AM

Thanks, this group is great!!...this should help a lot. For the user who
mentioned patent stuff I'm just making these custom lids for personal use.
Working on a device to discourage Fire Ants from certain areas around the
house (and I have a bunch of these glass jars). If your interested on how
i'm doing it here's more info on what I'm using
https://thesilveredge.com/is-colloidal-silver-effective-against-ants/ .I
tested this with a small sample of fire ants using a squirt botte and it
does work and you can make the stuff at home yourself for cheap.

Several tests at different concentrations were conducted over fifteen (15)
months. In all cases after an initial reaction period varying from about 2
to about 4 weeks during which fire ant activity steadily decreased, the
treated areas were then free of fire ant mounds for approximately six (6)
months to one (1) year.

A second application of solution to the same mounds about one year after
the initial treatment achieved the repellant result within a shorter period
of about 1 to 2 weeks. After the initial application, the tested areas were
regularly maintained (mowed and cleaned of debris).”

Thanks Again

On Wed, Jun 23, 2021 at 9:42 PM jon jon@jonbondy.com wrote:

What a responsive community we have! Makes me smile!

Jon
On 6/23/2021 9:12 PM, Revar Desmera wrote:

I tweaked thread_helix() in BOSL2 to allow a starts= argument, so now you
can do something like:

include <BOSL2/std.scad>
include <BOSL2/threading.scad>
thread_helix(d=50, pitch=8, thread_depth=2, thread_angle=30, starts=8,
twist=45, higbee=3, $fn=72);

Revar

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Thanks, this group is great!!...this should help a lot. For the user who mentioned patent stuff I'm just making these custom lids for personal use. Working on a device to discourage Fire Ants from certain areas around the house (and I have a bunch of these glass jars). If your interested on how i'm doing it here's more info on what I'm using https://thesilveredge.com/is-colloidal-silver-effective-against-ants/ .I tested this with a small sample of fire ants using a squirt botte and it does work and you can make the stuff at home yourself for cheap. *Several tests at different concentrations were conducted over fifteen (15) months. In all cases after an initial reaction period varying from about 2 to about 4 weeks during which fire ant activity steadily decreased, the treated areas were then free of fire ant mounds for approximately six (6) months to one (1) year.* *A second application of solution to the same mounds about one year after the initial treatment achieved the repellant result within a shorter period of about 1 to 2 weeks. After the initial application, the tested areas were regularly maintained (mowed and cleaned of debris).”* *Thanks Again* On Wed, Jun 23, 2021 at 9:42 PM jon <jon@jonbondy.com> wrote: > What a responsive community we have! Makes me smile! > > Jon > On 6/23/2021 9:12 PM, Revar Desmera wrote: > > I tweaked thread_helix() in BOSL2 to allow a starts= argument, so now you > can do something like: > > include <BOSL2/std.scad> > include <BOSL2/threading.scad> > thread_helix(d=50, pitch=8, thread_depth=2, thread_angle=30, starts=8, > twist=45, higbee=3, $fn=72); > > > > > - Revar > > > _______________________________________________ > OpenSCAD mailing list > To unsubscribe send an email to discuss-leave@lists.openscad.org > -- ----- "There are two modes of being those in bliss and those seeking bliss, may each step you take and each thought you make be made in a mindful and blissful state." This message is confidential and is intended only for the individual(s) or entity named above and others who have been specifically authorized to receive it. If you are not the intended recipient, please do not read, copy, use or disclose the contents of this communication to others. Please notify the sender that you have received this e-mail in error by replying to the e-mail and then delete this email and any copies of it. Under no circumstances may the contents hereof be disclosed to the public without the sender's prior written permission. -----

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Creating Lug bottle threads includes imges

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