A picture of a Tulip Head of a screw ... when I google the term I get lots
of surgical implant stuff ... you're not doing surgical equipment are you?

On Sun, 17 Jul 2022 at 17:16, gene heskett gheskett@shentel.net wrote:

Is the screw head one of these?
https://en.wikipedia.org/wiki/Screw#Screw_head_shapes

Trygve

Den 17. juli 2022 kl. 19.05.33 +02.00 skrev Michael Möller private2michael@gmail.com:

On 7/17/22 13:09, Michael Möller wrote:

Not hardly Michael, it's the knob on the end of a vise handle.  And I am
changing my thinking a bit but the need for that shape isn't changed.
I'll move the flat face (the cube) to just clip off the the bottom, then
add a 19mm hole to fit over the end of the dowel, hollowing it out to
about the flat faces location. Then print a TPU sleeve with a 19mm bore
and a 25mm OD & 16 to 17mm long for the bumper.

This is the underside of the head of a commonly used here in the US
for a "deck" screw, holding the wooden planks of a front or back deck
or porch floor to its sub-framing  on your house. Usually with a T25 or
 so torx socket for a driving tool. google or DDG for deck screws should
get you some pix for reference.

I've got one of these making just to see if it fits the doweling.

module handle_washer()
{ $fn=180;
    translate([0,0,15.50])difference()
    {
        sphere(d=40);
        translate([-22.5,-22.5,-60.5])cube(45);
        translate([0,0,16])cylinder(h=10,d=4,center=true);
        translate([0,0,-2.1])cylinder(h=27,d=19,center=true);
    }
}

but I still need to see about the screw head socket on top of it.
And watching it form, its plain to see 40mm is too big, so I've
reduced it to 28mm and adjusted the rest to fit, but I think I've
found a bug, the ! in front of the sphere I expected to make it
transparent so I could see whats inside, but what it does do is
not helpful at all as it just turns it grey and solid.

Is that the intended behavior?
So I'll make this one next after I test fit whats making now.
module handle_cap()
{ $fn=180;
    translate([0,0,5.5])difference()
    {
        sphere(d=28);
        translate([0,0,9])cylinder(h=10,d=4,center=true);
        translate([0,0,-0.6])cylinder(h=11,d=19,center=true);
        translate([-22.5,-22.5,-50.5])cube(45);
    }
}

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, 1940)
If we desire respect for the law, we must first make the law respectable.

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

On 7/17/22 14:55, trygve@totallytrygve.com wrote:

No,  see attached pix, this is the screw I will be using, a #6 drywall
screw,
about 1.625" long. In looking at the #10 deck screws which are very
similarly
shaped, I came to the conclusion that drilling a pilot hole that big
would weaken
the oak at its position passing thru the bolt head, encouraging its
breakage.

So as mentioned in the last post, I've reduced the knob to 28mm in diameter
and adjusted the rest to fit. I've half or more of a 5lb box of this
screw, which will
not reach all the way thru the bolt's square head, needs a much smaller
pilot
hole etc. These screws are fairly hard steel, so the chances of popping the
head off are somewhere between slim and none.

But that should show the tulip shape I need to fit, somewhere around a
2.5 to
3mm radius with the outer edge being the preferred first contact point.

These have a #2 Phillips head. One Bosch #2 bit in variable speed drill
will drive
50 lbs of this screw. Unless you've a dummy running the drill. :o(>
Bosch makes
good stuff.

Thank you. Take care and stay well.

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, 1940)
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,
My money would be on just forming a standard countersunk hole for the
head.  I wouldn't worry about perfectly matching the curvature of the
deck screw.  Once it's all together, It won't matter and this doesn't
sound like a structural joint that will be under a significant amount of
tension either.

Just my $0.02.
Bill Lugg

On 7/17/22 14:47, gene heskett wrote:

On 7/17/2022 1:47 PM, gene heskett wrote:

"!" means "show only this object".  You probably mean "%", which means
"make this object transparent-gray, and don't include it in the final
model".

On 7/18/22 13:07, Jordan Brown wrote:

I tried both, neither gave me the xray view I needed. I needed to
see the penetration of a cylinder into a sphere, the cylinder being the
socket space inside the sphere for the end of the dowel/handle that
plugs into the sphere. This is the knob on the ends of a vise handle
that keeps the handle from falling plumb out of the screw head
when the user lets go of the handle.

Simple concept,but drove OpenSCAD into very slow rendering in 22 lines
of code.  But it worked well. Unfortunately the printer bricked itself while
trying to fix a flow problem which was only 25% of the flow needed to
print the parts. Fun and games this isn't. Changing the main board in a
Prusa MK3S is not in my definition of fun. Digging post holes for new fence
is. I should do more of it, but at 87 I'd druther pay a younger person. :-)

Thanks, take care and stay well, jordan.

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, 1940)
If we desire respect for the law, we must first make the law respectable.

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

On 7/18/2022 10:55 AM, gene heskett wrote:

Like so?

difference() {
    %sphere(r=10);
    cylinder(r=5, h=20);
}

On 7/18/22 13:28, Jordan Brown wrote:

That does make it grey, but there's nothing transparent about it,
its solid grey and nothing inside it can be seen. It also fouls the first
argument of a difference(), making line 2 the base against which lines
3,4,5 are subtracted, definitely not useful.

This is last months AppImage.

2022.04.29.ai11816 (git 68c63f61b)

Thank you Jordan, take care and stay well.

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, 1940)
If we desire respect for the law, we must first make the law respectable.

• Louis D. Brandeis
  Genes Web pagehttp://geneslinuxbox.net:6309/