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Added male screw threads.

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This commit is contained in:
Chris Palmer
2020-01-10 10:26:12 +00:00
parent f7ef075434
commit d703ae4997
18 changed files with 215 additions and 49 deletions
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2
utils/core/global.scad
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@@ -43,7 +43,7 @@ module ellipse(xr, yr) scale([1, yr / xr]) circle4n(xr);
module extrude_if(h, center = true) //! Extrudes 2D object to 3D when ```h``` is nonzero, otherwise leaves it 2D
if(h)
linear_extrude(height = h, center = center) // 3D
linear_extrude(height = h, center = center, convexity = 2) // 3D
children();
else
children(); // 2D

114
utils/thread.scad Normal file
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@@ -0,0 +1,114 @@
//
// NopSCADlib Copyright Chris Palmer 2019
// nop.head@gmail.com
// hydraraptor.blogspot.com
//
// This file is part of NopSCADlib.
//
// NopSCADlib is free software: you can redistribute it and/or modify it under the terms of the
// GNU General Public License as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// NopSCADlib is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along with NopSCADlib.
// If not, see <https://www.gnu.org/licenses/>.
//
//
//! A utilities for making threads with sweep.
//
include <../core.scad>
use <sweep.scad>
use <maths.scad>
function thread_profile(h, crest, angle) = //! Create thread profile path
let(base = crest + 2 * h * tan(angle / 2))
[[-base / 2, 0, 0], [-crest / 2, h, 0], [crest / 2, h, 0], [base / 2, 0, 0]];
module male_thread(pitch, minor_d, length, profile, taper_top = true, center = true, solid = true) { //! Create male thread
turns = length / pitch + (taper_top ? 0 : 1);
r = minor_d / 2;
sides = r2sides(r);
h = max([for(p = profile) p.y]);
final = (turns - 1) * sides;
path = [for(i = [0 : sides * turns],
R = i < sides ? r - h + h * i / sides
: i > final && taper_top ? r - h * (i - final) / sides : r,
a = i * 360 / sides)
[R * sin(-a), R * cos(-a), pitch * a / 360]];
t = atan(pitch / sides / (r * cos(225 / sides)));
translate_z(center ? -length / 2 : 0) {
render() intersection() {
sweep(path, profile, twist = t * sides * turns);
cylinder(d = minor_d + 5, h = length);
}
if(solid)
rotate(90)
cylinder(d = minor_d + eps, h = length);
}
}
module female_thread(pitch, outer_d, length, profile, taper_top = true, center = true) { //! Create female thread
turns = length / pitch + (taper_top ? 0 : 1);
r = outer_d / 2;
sides = r2sides(r);
h = max([for(p = profile) p.y]);
final = (turns - 1) * sides;
path = [for(i = [0 : sides * turns],
R = i < sides ? r + h - h * i / sides
: i > final && taper_top ? r + h * (i - final) / sides : r,
a = i * 360 / sides)
[R * sin(-a), R * cos(-a), pitch * a / 360]];
t = atan(pitch / sides / (r * cos(225 / sides)));
translate_z(center ? -length / 2 : 0) {
render() intersection() {
sweep(path, reverse([for(p = profile) [p.x, -p.y, 0]]), twist = t * sides * turns);
cylinder(d = outer_d + 5, h = length);
}
}
}
module male_metric_thread(d, pitch, length, taper_top = true, center = true) { //! Create male thread with metric profile
h = sqrt(3) / 2 * pitch;
minor_d = d - 5 * h / 4;
male_thread(pitch, minor_d, length, thread_profile((d - minor_d) / 2, pitch / 8, 60), taper_top, center);
}
module female_metric_thread(d, pitch, length, taper_top = true, center = true) { //! Create male thread with metric profile
h = sqrt(3) / 2 * pitch;
outer_d = d + 5 * h / 4;
male_thread(pitch, outer_d, length, thread_profile((outer_d - d) / 2, pitch / 8, 60), taper_top, center);
}
function metric_coarse_pitch(d) //! Convert metric diameter to pitch
= d == 1.6 ? 0.35 // M1.6
: [0.4, // M2
0.45,// M2.5
0.5, // M3
0.6, // M3.5
0.7, // M4
0,
0.8, // M5
0,
1.0, // M6
0,
0,
0,
1.25, // M8
0,
0,
0,
1.5, // M10
0,
0,
0,
1.75, // M12
][d * 2 - 4];
male_metric_thread(3, 0.5, 25);
translate([10, 0])
male_metric_thread(8, 1.25, 30);