M
mikeonenine@web.de
Thu, Sep 19, 2024 10:37 PM
Something else with teeth that the world has been waiting for: a face spline coupling aka Hirth coupling. I created it some time ago as part of a design, but it had a glitch that turned out to be because the circumference of a small sector of a circle is slightly longer than the straight line across it. This left tiny but visible gaps between the splines.
I thought it would be difficult to parametrise but it was not.
But it still has some sharp edges that need rounding. Any volunteers?
$fn=100;
$vpr=[ 60, 0, 315 ];
$vpt=[ 0, 0, 0 ];
$vpd=80;
/*
*/
a=60; // Base angle
r=12; // Radius
n=24; // Number of splines
module facespline()
{
difference()
{
intersection()
{
for(i = [1 : n])
rotate(i * 360/n)
polyhedron(
points = [
// Point 0
[0, 0, PI*r/2/n*tan(a)],
// Point 1
[r, r*tan(360/2/n), 0],
// Point 2
[r, -r*tan(360/2/n), 0],
// Point 3
[r, 0, PI*r/n*tan(a)],
// Point 4
[0, 0, 0]
],
faces = [
[1,2,3],
//[0,2,1],
[3,2,0],
[3,0,1],
[0,2,4], //
[0,4,1], //
[1,4,2] //
]);
cylinder(r=r, h=PI*r/16*tan(a)+1);
}
// Hole
translate([0,0,-1])
cylinder(r=6, h=5);
}}
// Face spline coupling
rotate([0, 0, $t*360])
{
translate([0, 0, -3])
facespline();
translate([0, 0, 3])
rotate([0, 180, 360/2/n])
facespline();
}
Something else with teeth that the world has been waiting for: a face spline coupling aka Hirth coupling. I created it some time ago as part of a design, but it had a glitch that turned out to be because the circumference of a small sector of a circle is slightly longer than the straight line across it. This left tiny but visible gaps between the splines.
I thought it would be difficult to parametrise but it was not.
But it still has some sharp edges that need rounding. Any volunteers?
`$fn=100;`
`$vpr=[ 60, 0, 315 ];`
`$vpt=[ 0, 0, 0 ];`
`$vpd=80;`
`/*`
`*/`
`a=60; // Base angle`
`r=12; // Radius`
`n=24; // Number of splines`
`module facespline()`
`{`
`difference()`
`{`
`intersection()`
`{`
`for(i = [1 : n])`
`rotate(i * 360/n)`
`polyhedron( `
`points = [ `
`// Point 0`
`[0, 0, PI*r/2/n*tan(a)],`
`// Point 1`
`[r, r*tan(360/2/n), 0], `
`// Point 2`
`[r, -r*tan(360/2/n), 0], `
`// Point 3 `
`[r, 0, PI*r/n*tan(a)],`
`// Point 4`
`[0, 0, 0]`
`], `
`faces = [ `
`[1,2,3],`
`//[0,2,1], `
`[3,2,0],`
`[3,0,1],`
`[0,2,4], //`
`[0,4,1], //`
`[1,4,2] //`
`]);`
`cylinder(r=r, h=PI*r/16*tan(a)+1);`
`}`
`// Hole`
`translate([0,0,-1])`
`cylinder(r=6, h=5);`
`}}`
`// Face spline coupling`
`rotate([0, 0, $t*360])`
`{`
`translate([0, 0, -3])`
`facespline();`
`translate([0, 0, 3])`
`rotate([0, 180, 360/2/n])`
`facespline();`
`}`
BC
Bob Carlson
Thu, Sep 19, 2024 11:40 PM
I was curious what this looks like so I loaded it up and hit F6. I get No Geometry to Render.
-Bob
On Sep 19, 2024, at 15:37, Caddiy via Discuss discuss@lists.openscad.org wrote:
Something else with teeth that the world has been waiting for: a face spline coupling aka Hirth coupling. I created it some time ago as part of a design, but it had a glitch that turned out to be because the circumference of a small sector of a circle is slightly longer than the straight line across it. This left tiny but visible gaps between the splines.
I thought it would be difficult to parametrise but it was not.
But it still has some sharp edges that need rounding. Any volunteers?
$fn=100;
$vpr=[ 60, 0, 315 ];
$vpt=[ 0, 0, 0 ];
$vpd=80;
/*
*/
a=60; // Base angle
r=12; // Radius
n=24; // Number of splines
module facespline()
{
difference()
{
intersection()
{
for(i = [1 : n])
rotate(i * 360/n)
polyhedron(
points = [
// Point 0
[0, 0, PIr/2/ntan(a)],
// Point 1
[r, r*tan(360/2/n), 0],
// Point 2
[r, -r*tan(360/2/n), 0],
// Point 3
[r, 0, PIr/ntan(a)],
// Point 4
[0, 0, 0]
],
faces = [
[1,2,3],
//[0,2,1],
[3,2,0],
[3,0,1],
[0,2,4], //
[0,4,1], //
[1,4,2] //
]);
cylinder(r=r, h=PIr/16tan(a)+1);
}
// Hole
translate([0,0,-1])
cylinder(r=6, h=5);
}}
// Face spline coupling
rotate([0, 0, $t*360])
{
translate([0, 0, -3])
facespline();
translate([0, 0, 3])
rotate([0, 180, 360/2/n])
facespline();
}
OpenSCAD mailing list
To unsubscribe send an email to discuss-leave@lists.openscad.org
I was curious what this looks like so I loaded it up and hit F6. I get No Geometry to Render.
-Bob
> On Sep 19, 2024, at 15:37, Caddiy via Discuss <discuss@lists.openscad.org> wrote:
>
> Something else with teeth that the world has been waiting for: a face spline coupling aka Hirth coupling. I created it some time ago as part of a design, but it had a glitch that turned out to be because the circumference of a small sector of a circle is slightly longer than the straight line across it. This left tiny but visible gaps between the splines.
>
> I thought it would be difficult to parametrise but it was not.
>
> But it still has some sharp edges that need rounding. Any volunteers?
>
> $fn=100;
>
> $vpr=[ 60, 0, 315 ];
>
> $vpt=[ 0, 0, 0 ];
>
> $vpd=80;
>
> /*
>
> */
>
> a=60; // Base angle
>
> r=12; // Radius
>
> n=24; // Number of splines
>
> module facespline()
>
> {
>
> difference()
>
> {
>
> intersection()
>
> {
>
> for(i = [1 : n])
>
> rotate(i * 360/n)
>
> polyhedron(
>
> points = [
>
> // Point 0
>
> [0, 0, PI*r/2/n*tan(a)],
>
> // Point 1
>
> [r, r*tan(360/2/n), 0],
>
> // Point 2
>
> [r, -r*tan(360/2/n), 0],
>
> // Point 3
>
> [r, 0, PI*r/n*tan(a)],
>
> // Point 4
>
> [0, 0, 0]
>
> ],
>
> faces = [
>
> [1,2,3],
>
> //[0,2,1],
>
> [3,2,0],
>
> [3,0,1],
>
> [0,2,4], //
>
> [0,4,1], //
>
> [1,4,2] //
>
> ]);
>
> cylinder(r=r, h=PI*r/16*tan(a)+1);
>
> }
>
> // Hole
>
> translate([0,0,-1])
>
> cylinder(r=6, h=5);
>
> }}
>
> // Face spline coupling
>
> rotate([0, 0, $t*360])
>
> {
>
> translate([0, 0, -3])
>
> facespline();
>
> translate([0, 0, 3])
>
> rotate([0, 180, 360/2/n])
>
> facespline();
>
> }
>
> _______________________________________________
> OpenSCAD mailing list
> To unsubscribe send an email to discuss-leave@lists.openscad.org
DP
Dan Perry
Thu, Sep 19, 2024 11:51 PM
I was curious what this looks like so I loaded it up and hit F6. I get No
Geometry to Render.
-Bob
On Sep 19, 2024, at 15:37, Caddiy via Discuss discuss@lists.openscad.org
wrote:
Something else with teeth that the world has been waiting for: a face
spline coupling aka Hirth coupling. I created it some time ago as part of a
design, but it had a glitch that turned out to be because the circumference
of a small sector of a circle is slightly longer than the straight line
across it. This left tiny but visible gaps between the splines.
I thought it would be difficult to parametrise but it was not.
But it still has some sharp edges that need rounding. Any volunteers?
$fn=100;
$vpr=[ 60, 0, 315 ];
$vpt=[ 0, 0, 0 ];
$vpd=80;
/*
*/
a=60; // Base angle
r=12; // Radius
n=24; // Number of splines
module facespline()
{
difference()
{
intersection()
{
for(i = [1 : n])
rotate(i * 360/n)
polyhedron(
points = [
// Point 0
[0, 0, PIr/2/ntan(a)],
// Point 1
[r, r*tan(360/2/n), 0],
// Point 2
[r, -r*tan(360/2/n), 0],
// Point 3
[r, 0, PIr/ntan(a)],
// Point 4
[0, 0, 0]
],
faces = [
[1,2,3],
//[0,2,1],
[3,2,0],
[3,0,1],
[0,2,4], //
[0,4,1], //
[1,4,2] //
]);
cylinder(r=r, h=PIr/16tan(a)+1);
}
// Hole
translate([0,0,-1])
cylinder(r=6, h=5);
}}
// Face spline coupling
rotate([0, 0, $t*360])
{
translate([0, 0, -3])
facespline();
translate([0, 0, 3])
rotate([0, 180, 360/2/n])
facespline();
}
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
Me too.
On Thu, Sep 19, 2024 at 4:40 PM Bob Carlson via Discuss <
discuss@lists.openscad.org> wrote:
> I was curious what this looks like so I loaded it up and hit F6. I get No
> Geometry to Render.
>
> -Bob
>
> On Sep 19, 2024, at 15:37, Caddiy via Discuss <discuss@lists.openscad.org>
> wrote:
>
> Something else with teeth that the world has been waiting for: a face
> spline coupling aka Hirth coupling. I created it some time ago as part of a
> design, but it had a glitch that turned out to be because the circumference
> of a small sector of a circle is slightly longer than the straight line
> across it. This left tiny but visible gaps between the splines.
>
> I thought it would be difficult to parametrise but it was not.
>
> But it still has some sharp edges that need rounding. Any volunteers?
>
> $fn=100;
>
> $vpr=[ 60, 0, 315 ];
>
> $vpt=[ 0, 0, 0 ];
>
> $vpd=80;
>
> /*
>
> */
>
> a=60; // Base angle
>
> r=12; // Radius
>
> n=24; // Number of splines
>
> module facespline()
>
> {
>
> difference()
>
> {
>
> intersection()
>
> {
>
> for(i = [1 : n])
>
> rotate(i * 360/n)
>
> polyhedron(
>
> points = [
>
> // Point 0
>
> [0, 0, PI*r/2/n*tan(a)],
>
> // Point 1
>
> [r, r*tan(360/2/n), 0],
>
> // Point 2
>
> [r, -r*tan(360/2/n), 0],
>
> // Point 3
>
> [r, 0, PI*r/n*tan(a)],
>
> // Point 4
>
> [0, 0, 0]
>
> ],
>
> faces = [
>
> [1,2,3],
>
> //[0,2,1],
>
> [3,2,0],
>
> [3,0,1],
>
> [0,2,4], //
>
> [0,4,1], //
>
> [1,4,2] //
>
> ]);
>
> cylinder(r=r, h=PI*r/16*tan(a)+1);
>
> }
>
> // Hole
>
> translate([0,0,-1])
>
> cylinder(r=6, h=5);
>
> }}
>
> // Face spline coupling
>
> rotate([0, 0, $t*360])
>
> {
>
> translate([0, 0, -3])
>
> facespline();
>
> translate([0, 0, 3])
>
> rotate([0, 180, 360/2/n])
>
> facespline();
>
> }
> _______________________________________________
> 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
>
M
mikeonenine@web.de
Thu, Sep 19, 2024 11:55 PM
Works perfectly here.
Previews immediately with the cube-and-chevron icon, took a little longer with F6.
Works perfectly here.
Previews immediately with the cube-and-chevron icon, took a little longer with F6.
BC
Bob Carlson
Fri, Sep 20, 2024 12:13 AM
I am on a relatively recent snapshot. Are you using the (ancient) “released” version? Or maybe a more recent snapshot?
I am on a relatively recent snapshot. Are you using the (ancient) “released” version? Or maybe a more recent snapshot?
> On Sep 19, 2024, at 16:55, Caddiy via Discuss <discuss@lists.openscad.org> wrote:
>
> Works perfectly here.
>
> Previews immediately with the cube-and-chevron icon, took a little longer with F6.
>
> _______________________________________________
> OpenSCAD mailing list
> To unsubscribe send an email to discuss-leave@lists.openscad.org
M
mikeonenine@web.de
Fri, Sep 20, 2024 12:15 AM
This is what you should see.
BTW I said sector above, but meant segment.
This is what you should see.
BTW I said sector above, but meant segment.
M
mikeonenine@web.de
Fri, Sep 20, 2024 12:20 AM
I am on a relatively recent snapshot. Are you using the (ancient) “released” version? Or maybe a more recent snapshot?
On Sep 19, 2024, at 16:55, Caddiy via Discuss discuss@lists.openscad.org wrote:
Works perfectly here.
Previews immediately with the cube-and-chevron icon, took a little longer with F6.
i Am using Version 2021.01, but that shouldn’t make any difference?
> I am on a relatively recent snapshot. Are you using the (ancient) “released” version? Or maybe a more recent snapshot?
>
> On Sep 19, 2024, at 16:55, Caddiy via Discuss [discuss@lists.openscad.org](mailto:discuss@lists.openscad.org) wrote:
>
> Works perfectly here.
>
> Previews immediately with the cube-and-chevron icon, took a little longer with F6.
>
> ---
>
> > OpenSCAD mailing list \
> > To unsubscribe send an email to [discuss-leave@lists.openscad.org](mailto:discuss-leave@lists.openscad.org)
i Am using Version 2021.01, but that shouldn’t make any difference?
M
mikeonenine@web.de
Fri, Sep 20, 2024 12:37 AM
Still no joy?
Try deleting all //, /* and */.
Still no joy?
Try deleting all //, /\* and \*/.
K
Ken
Fri, Sep 20, 2024 12:50 AM
I tried that, still no joy. I'm running 2024.08.30
F5 says Compile & preview finished, total rendering time 0.064 seconds- but there's nothing there.
F6 says there is no top-level geometry to render.
On 2024-09-20 10:37, Caddiy via Discuss wrote:
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!
I tried that, still no joy. I'm running 2024.08.30
F5 says Compile & preview finished, total rendering time 0.064 seconds- but there's nothing there.
F6 says there is no top-level geometry to render.
On 2024-09-20 10:37, Caddiy via Discuss wrote:
>
> Still no joy?
>
> Try deleting all //, /* and */.
>
>
> _______________________________________________
> OpenSCAD mailing list
> To unsubscribe send an email todiscuss-leave@lists.openscad.org
--
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!
M
mikeonenine@web.de
Fri, Sep 20, 2024 1:07 AM
Does this work for you?
$fn=100;
$vpr=[ 60, 0, 315 ];
$vpt=[ 0, 0, 0 ];
$vpd=80;
a=60; // Base angle
r=12; // Radius
n=16; // Number of splines
module facespline()
{
difference()
{
intersection()
{
for(i = [1 : n])
rotate(i * 360/n)
polyhedron(
points = [
[0, 0, PI*r/2/n*tan(a)],
[r, r*tan(360/2/n), 0],
[r, -r*tan(360/2/n), 0],
[r, 0, PI*r/n*tan(a)],
[0, 0, 0]
],
faces = [
[1,2,3],
[3,2,0],
[3,0,1],
[0,2,4],
[0,4,1],
[1,4,2]
]);
cylinder(r=r, h=PI*r/16*tan(a)+1);
}
// Hole
translate([0,0,-1])
cylinder(r=6, h=5);
}}
// Face spline coupling
{
translate([0, 0, -3])
facespline();
translate([0, 0, 3])
rotate([0, 180, 360/2/n])
facespline();
}
##### Does this work for you?
###### `$fn=100;`
`$vpr=[ 60, 0, 315 ];`
`$vpt=[ 0, 0, 0 ];`
`$vpd=80;`
`a=60; // Base angle`
`r=12; // Radius`
`n=16; // Number of splines`
`module facespline()`
`{`
`difference()`
`{`
`intersection()`
`{`
`for(i = [1 : n])`
`rotate(i * 360/n)`
`polyhedron(`
`points = [`
`[0, 0, PI*r/2/n*tan(a)],`
`[r, r*tan(360/2/n), 0],`
`[r, -r*tan(360/2/n), 0],`
`[r, 0, PI*r/n*tan(a)],`
`[0, 0, 0]`
`],`
`faces = [`
`[1,2,3],`
`[3,2,0],`
`[3,0,1],`
`[0,2,4], `
`[0,4,1], `
`[1,4,2] `
`]);`
`cylinder(r=r, h=PI*r/16*tan(a)+1);`
`}`
`// Hole`
`translate([0,0,-1])`
`cylinder(r=6, h=5);`
`}}`
`// Face spline coupling`
`{`
`translate([0, 0, -3])`
`facespline();`
`translate([0, 0, 3])`
`rotate([0, 180, 360/2/n])`
`facespline();`
`}`
