91 lines
3.3 KiB
OpenSCAD
91 lines
3.3 KiB
OpenSCAD
//
|
|
// NopSCADlib Copyright Chris Palmer 2020
|
|
// 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/>.
|
|
//
|
|
|
|
//
|
|
//! Circlips aka tapered retaining rings.
|
|
//
|
|
include <../utils/core/core.scad>
|
|
include <../utils/sector.scad>
|
|
include <../utils/round.scad>
|
|
include <../utils/maths.scad>
|
|
|
|
function circlip_d1(type) = type[1]; //! Nominal OD, i.e. diameter of tube
|
|
function circlip_d2(type) = type[2]; //! Groove diameter, i.e. OD when installed
|
|
function circlip_d3(type) = type[3]; //! Relaxed OD when not installed
|
|
function circlip_thickness(type) = type[4]; //! Thickness
|
|
function circlip_a(type) = type[5]; //! Size of the lugs
|
|
function circlip_b(type) = type[6]; //! Widest part of the taper
|
|
function circlip_d5(type) = type[7]; //! Plier hole diameter
|
|
|
|
circlip_colour = grey(20);
|
|
closed_angle = 25;
|
|
|
|
module internal_circlip(type, open = 0) { //! Draw specified internal circlip, open = 0, for nominal size installed, 1 for relaxed uninstalled, -1 for squeezed to install
|
|
d1 = circlip_d1(type);
|
|
|
|
vitamin(str("circlip(", type[0], "): Circlip internal ", d1, "mm"));
|
|
d3 = circlip_d3(type);
|
|
d2 = circlip_d2(type);
|
|
a = circlip_a(type);
|
|
b = circlip_b(type);
|
|
d5 = circlip_d5(type);
|
|
|
|
od = lookup(open, [[-1, d1], [0, d2], [1, d3]]);
|
|
or = od / 2;
|
|
c = (d3 - d1);
|
|
|
|
angle = (od - d1) / d1 * 360 + closed_angle;
|
|
tab_angle = 360 * a / PI / od;
|
|
p = [0, -or + b / 2, 1] * rot3_z(angle / 2 + tab_angle);
|
|
pitch = (or - a / 2);
|
|
y_offset = (sqr(p.x) + sqr(p.y) - sqr(or - b)) / (or - b - p.y) / 2;
|
|
ir = or - b + y_offset;
|
|
color(circlip_colour)
|
|
linear_extrude(circlip_thickness(type), center = true)
|
|
round((a - d5) / 5)
|
|
union() {
|
|
difference() {
|
|
circle(or);
|
|
|
|
translate([0, -y_offset])
|
|
circle(ir);
|
|
|
|
sector(d3 / 2 + 1, 270 - angle / 2 - tab_angle, 270 + angle / 2 + tab_angle);
|
|
|
|
}
|
|
for(side = [-1, 1])
|
|
intersection() {
|
|
circle(or);
|
|
|
|
rotate(side * (angle + tab_angle) / 2)
|
|
difference() {
|
|
hull() {
|
|
translate([0, -pitch])
|
|
circle(d = a);
|
|
|
|
translate([0, -pitch - a])
|
|
circle(d = 1.5 * a);
|
|
}
|
|
translate([0, -pitch])
|
|
circle(d = d5);
|
|
}
|
|
}
|
|
}
|
|
}
|