It renders for me, but there's very little left after the difference().  I
think the value of 13.65 is not correct.  For a design like this that's not
intended to be symmetrical on z-axis, I suggest anchoring to the X-Y plane
with ANCHOR=BOTTOM arguments.  And use left_half() to see the cross section.
Dan

On Fri, May 16, 2025 at 1:58 PM larry via Discuss <
discuss@lists.openscad.org> wrote:

On Fri, 2025-05-16 at 14:06 -0700, Dan Perry via Discuss wrote:

Thanks Dan! Your answer baffled me for a minute, but it led me to the
solution. The Acme threaded rod was sticking down past the part I said
didn't render. Of course it rendered, but was cut out by the threaded
rod.

All good now!

Larry, not sure if I am understanding your problem correctly, but I assume you want a solid end to the adapter?
In which case, just move the problem line up to just after the closing bracket of the difference.

On 2025-05-17 06:58, larry via Discuss wrote:

--
Cheers, Ken
bats059@gmail.com
https://vk7krj.com
https://vk7krj.com/running.html

A baby can be defined as an ego with a noise at one end and a smell at the other.
Your job as parents is to teach them to control all three.
My job as a grandad is to tell you how you are doing it all wrong!

On Sat, 2025-05-17 at 07:53 +1000, Ken via Discuss wrote:

I do.

That would not have worked, as the problem was that the long threaded
rod extended beyond the female part at both ends, so when I added the
solid end, it actually cut it. It was simply a matter of making the rod
shorter and positioning it properly.

Here's the code that works...

//----------------------

include <BOSL2/std.scad>
include <BOSL2/threading.scad>
$fn= $preview ? 60 : 180;

difference() {
female();
up(2.5) acme_threaded_rod(d=19.8, l=30, pitch=5.08);
}

module female() {
union() {
tube(id=17.05,od=22.6,h=25.4);
up(2.3) tube(id=22.7,od=27,h=35);
down(15.18)cylinder(h=2.5,d=27);
}
}

//----------------------

On 5/16/25 17:06, Dan Perry via Discuss wrote:

// renders fine here. but with 13.65mm of empty air above it before it
gets the to the

//main socket. is it supposed to be the bottom of the hole?  And dollar
store handles

// do not come with square threads in these here parts.

Cheers, Gene Heskett, CET.

"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.

• Louis D. Brandeis

On Sat, 2025-05-17 at 01:19 -0400, gene heskett via Discuss wrote:

I know. when I tried to find info about the thread, most of the ones
that came up has some sort or round thread. Here they are all acme, 2mm
pitch.

On 5/17/25 01:35, larry via Discuss wrote:

A not always  optimum choice. Since these screw in to bottom out, a
buttress thread makes far more  sense, but would have to be applied to
the broom handle too.

In your case a polygon describing the rounded shape would seen to make a
much stronger joint than square or even acme. Digitize a sine wave as
fine as the printer can render well, extrude it for the space needed,
and translate & rotate into position around the cylinder representing
the shank of the bolt.  center=true. make the bolt bigger by the
diameter of the nozzle and use that expanded bolt to difference the half
nut into a block. 2 start threads then makes 2 identical half nuts.

Cheers, Gene Heskett, CET.

"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.

• Louis D. Brandeis

On Sat, 2025-05-17 at 02:24 -0400, gene heskett via Discuss wrote:

Probably a better method, Gene, but I think I'll try my plan first.

The final results will be modified forms of these:
https://www.mastersofgames.com/cat/bowls/ubi-launcher-bowls-delivery-aid.htm

https://www.mastersofgames.com/cat/bowls/bowling-arm.htm

The part in my code was only a test to experiment with fit. the top
outer cylinder will be about 100mm long, and will serve to attach (in
the case of the UBI Launcher), wings connecting to the business end in
order to strengthen the part that pushes the bowl. The way I envision
it, printing it at an angle to orient the layer lines for strength,
should be strong enough.

The 'bowling arm' is the easiest one to use, and I think I can make it
strong enough.

On 5/17/25 14:45, larry via Discuss wrote:

I can easily see, at those prices, why you would like to print them,
saving at least $150 a copy.  OTIH its also apparently a very low volume
endeavor at most any price due to its lack of player numbers.

I'm doing a similar thing, primarily because no other person has made a
similar product, but completed,  its at least 2 man weeks of 16 hour
days per completed unit when I've only 1 printer, so first thing after
making the first 9 copies, is building bigger, faster printers. Printers
around 10x faster than the current offerings at $1000,  Replacing steel,
alu etc moving parts with carbon fiber to reduce flying weight. And
using closed loop stepper/servos I can drive at much higher speeds with
micron accuracy. Much higher bed temps too, all of which cost money in
little red wagon loads but the first one does poloycarbonate like it was
PLA.  So I'm getting there slowly as I'm now 90.  And of course I'm well
aware that at 90 yo & a long term diabetic, I am running out of time.

I post not to discourage you, but to warn you that such an undertaking
can be a black hole for startup funds and a huge ongoing time sink.  Its
quite a ways from idea to depositing checks in the bank.  Good luck.

Cheers, Gene Heskett, CET.

"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.

• Louis D. Brandeis