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Reimplemented teardrop_plus() again.

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Chris Palmer 2020-07-20 16:55:55 +01:00
parent 6a26903514
commit cb4fa40643
9 changed files with 70 additions and 46 deletions
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7
readme.md
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@ -5292,7 +5292,7 @@ Method to print holes in mid air. See <https://hydraraptor.blogspot.com/2014/03/
---
<a name="Horiholes"></a>
## Horiholes
Utilities for depicting the staircase slicing of horizontal holes made with [`teardrop_plus()`](#teardrops), see <https://hydraraptor.blogspot.com/2020/07/horiholes_36.html>
Utilities for depicting the staircase slicing of horizontal holes made with [`teardrop_plus()`](#teardrops), see <https://hydraraptor.blogspot.com/2020/07/horiholes-2.html>
[utils/horiholes.scad](utils/horiholes.scad) Implementation.
@ -5302,8 +5302,7 @@ Utilities for depicting the staircase slicing of horizontal holes made with [`te
### Functions
| Function | Description |
|:--- |:--- |
| ```teardrop_plus_x(r, y, h)``` | Calculate the ordinate of a compensated teardrop given y. |
| ```teardrop_x(r, y)``` | Calculate the ordinate of a teardrop given y. Sweeping y from -r to + r yields the positive X half of the shape. |
| ```teardrop_plus_x(r, y, h)``` | Calculate the ordinate of a compensated teardrop given y and layer height. |
### Modules
| Module | Description |
@ -5886,7 +5885,7 @@ For making horizontal holes that don't need support material.
Small holes can get away without it, but they print better with truncated teardrops.
Using teardrop_plus() or setting the plus option on other modules will elongate the teardrop vertically by the layer height, so when sliced the staircase tips
do not intrude into the circle. See <https://hydraraptor.blogspot.com/2020/07/horiholes_36.html>
do not intrude into the circle. See <https://hydraraptor.blogspot.com/2020/07/horiholes-2.html>
[utils/core/teardrops.scad](utils/core/teardrops.scad) Implementation.

32
tests/horiholes.scad
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@ -21,19 +21,21 @@ include <../utils/core/core.scad>
use <../utils/horiholes.scad>
show_disc = true;
thickness = 3;
length = 50;
use_horihole = true;
thickness = 6;
length = 60;
height = 20;
overlap_x = 15;
overlap_y = 5;
overlap_y = 10;
module hole_positions() {
x0 = (length - 40) / 2;
for($i = [0 : 4], $z = 5 + $i * layer_height / 5, $r = 3)
translate([5 + $i * 10, $z])
translate([x0 + $i * 10, $z])
children();
for($i = [0 : 4], $z = 15 + $i * layer_height / 5, $r = 0.5 + $i / 2)
translate([5 + $i * 10, $z])
translate([x0 + $i * 10, $z])
children();
}
@ -45,7 +47,10 @@ module horiholes_stl(t = thickness) {
square([length, height]);
hole_positions()
horihole($r, $z);
if(use_horihole)
horihole($r, $z);
else
teardrop_plus(h = 0, r = $r);
}
}
}
@ -67,16 +72,15 @@ module horiholes() {
hole_positions()
color("red")
linear_extrude(2 * eps, center = true)
//offset(0.01, $fn = 360)
intersection() {
difference() {
square(8, center = true);
intersection() {
difference() {
square(8, center = true);
horihole($r, $z);
}
circle($r, $fn = 360);
horihole($r, $z);
}
circle($r, $fn = 360);
}
}
if($preview)

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8
tests/teardrops.scad
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@ -41,7 +41,10 @@ module teardrops() {
translate([20, 10])
semi_teardrop(h = 0, r = 3);
}
translate([20, 20])
teardrop(h = 0, r = 3, truncate = false, plus = true);
}
}
translate([40, 0, 1.5]) {
h = 3 + eps;
@ -61,6 +64,9 @@ module teardrops() {
translate([20, 10])
semi_teardrop(h = h, r = 3, chamfer = chamfer);
translate([20, 20])
teardrop(h = h, r = 3, truncate = false, plus = false, chamfer = chamfer);
}
}
}

33
utils/core/teardrops.scad
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@ -22,22 +22,31 @@
//! Small holes can get away without it, but they print better with truncated teardrops.
//!
//! Using teardrop_plus() or setting the plus option on other modules will elongate the teardrop vertically by the layer height, so when sliced the staircase tips
//! do not intrude into the circle. See <https://hydraraptor.blogspot.com/2020/07/horiholes_36.html>
//! do not intrude into the circle. See <https://hydraraptor.blogspot.com/2020/07/horiholes-2.html>
//
module teardrop(h, r, center = true, truncate = true, chamfer = 0, plus = false) { //! For making horizontal holes that don't need support material, set ```truncate = false``` to make traditional RepRap teardrops that don't even need bridging
module teardrop_2d(r, truncate)
module teardrop_2d(r, truncate) {
er = layer_height / 2 - eps; // Extrustion edge radius
R = plus ? r + er : r; // Corrected radius
offset = plus ? -er : 0; // Offset inwards
hull()
for(y = plus ? [-1 : 1] : 0)
translate([0, y * (layer_height / 2 - eps)]) {
for(side = [0 : 1])
mirror([side, 0, 0])
intersection() {
hull()
translate([offset, 0]) {
circle4n(R);
circle4n(r);
if(truncate)
translate([0, r / 2])
square([2 * r * (sqrt(2) - 1), r], center = true);
else
polygon([[0, 0], [eps, 0], [0, r * sqrt(2)]]);
}
if(truncate)
translate([0, R / 2])
square([2 * R * (sqrt(2) - 1), R], center = true);
else
polygon([[0, 0], [eps, 0], [0, R * sqrt(2)]]);
}
translate([0, -2 * R])
square([R, 4 * R]);
}
}
render(convexity = 5)
extrude_if(h, center)

36
utils/horiholes.scad
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@ -18,21 +18,20 @@
//
//
//! Utilities for depicting the staircase slicing of horizontal holes made with [`teardrop_plus()`](#teardrops), see <https://hydraraptor.blogspot.com/2020/07/horiholes_36.html>
//! Utilities for depicting the staircase slicing of horizontal holes made with [`teardrop_plus()`](#teardrops), see <https://hydraraptor.blogspot.com/2020/07/horiholes-2.html>
//
include <../utils/core/core.scad>
function teardrop_x(r, y) = //! Calculate the ordinate of a teardrop given y. Sweeping y from -r to + r yields the positive X half of the shape.
let(x2 = sqr(r) - sqr(y))
y > r / sqrt(2) ? y >= r ? 0
: r * sqrt(2) - y
: x2 > 0 ? sqrt(x2)
: 0;
function teardrop_plus_x(r, y, h) = //! Calculate the ordinate of a compensated teardrop given y.
y < -h ? teardrop_x(r, y + h)
: y > h ? teardrop_x(r, y - h)
: r;
function teardrop_plus_x(r, y, h) = //! Calculate the ordinate of a compensated teardrop given y and layer height.
let(fr = h / 2,
hpot = r + fr,
x2 = sqr(hpot) - sqr(y),
x = x2 > 0 ? sqrt(x2) : 0
)
max(0,
y < hpot / sqrt(2) ? x - fr :
y < hpot ? hpot * sqrt(2) - y - fr :
0);
module horihole(r, z, h = 0, center = true) { //! For making horizontal holes that don't need support material and are correct dimensions
bot_layer = floor((z - r) / layer_height);
@ -41,9 +40,16 @@ module horihole(r, z, h = 0, center = true) { //! For making horizontal holes th
extrude_if(h, center)
for(i = [bot_layer : top_layer]) {
Z = i * layer_height;
x = teardrop_plus_x(r, Z - z + layer_height / 2, layer_height / 2);
y = Z - z + layer_height / 2;
x = teardrop_plus_x(r, y, layer_height);
if(x > 0)
translate([-x, Z - z])
square([2 * x, layer_height]);
translate([0, y])
difference() {
square([2 * x + layer_height, layer_height], center = true);
for(end = [-1, 1])
translate([end * (x + layer_height / 2), 0])
circle(d = layer_height, $fn = 32);
}
}
}