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Added printable pulleys.

This commit is contained in:
Martin Budden 2021-01-08 13:07:51 +00:00
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commit 0b14d3fbc4
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//
// NopSCADlib Copyright Chris Palmer 2018
// 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/>.
//
//
// Printed pulleys are a remix of droftarts's (see <https://www.thingiverse.com/droftarts/designs>) Parametric Pulleys
// on Thingiverse (see <https://www.thingiverse.com/thing:16627>) and are licensed under the
// Creative Commons - Attribution - Share Alike license (see <https://creativecommons.org/licenses/by-sa/3.0/>)
//
//
include <NopSCADlib/core.scad>
include <NopSCADlib/vitamins/pulleys.scad>
printed_pulley_GT2_profile = [[0.747183,-0.5],[0.747183,0],[0.647876,0.037218],[0.598311,0.130528],[0.578556,0.238423],[0.547158,0.343077],[0.504649,0.443762],[0.451556,0.53975],[0.358229,0.636924],[0.2484,0.707276],[0.127259,0.750044],[0,0.76447],[-0.127259,0.750044],[-0.2484,0.707276],[-0.358229,0.636924],[-0.451556,0.53975],[-0.504797,0.443762],[-0.547291,0.343077],[-0.578605,0.238423],[-0.598311,0.130528],[-0.648009,0.037218],[-0.747183,0],[-0.747183,-0.5]];
function printed_pulley_od(tooth_count, tooth_pitch, pitch_line_offset)
= tooth_count * tooth_pitch / PI - 2 * pitch_line_offset;
module printed_pulley_teeth_from_profile(tooth_count, tooth_depth, tooth_width, tooth_profile) {
pulley_od = printed_pulley_od(tooth_count, 2, 0.254);
difference() {
rotate (90 / tooth_count)
circle(r = pulley_od / 2, $fn = tooth_count * 4);
tooth_distance_from_centre = sqrt(pulley_od * pulley_od - (tooth_width + 0.2) * (tooth_width + 0.2)) / 2;
for(i = [1 : tooth_count])
rotate(i * 360 / tooth_count)
translate([0, -tooth_distance_from_centre])
scale([(tooth_width + 0.2) / tooth_width, 1])
polygon(tooth_profile);
}
}
module printed_pulley_GT2_teeth(type) {
tooth_count = pulley_teeth(type);
if (tooth_count == 0)
circle(r = pulley_od(type) / 2);
else
printed_pulley_teeth_from_profile(tooth_count, 0.764, 1.494, printed_pulley_GT2_profile);
}
module printed_pulley_teeth(type) { //! Draw the pulley's teeth
tooth_count = pulley_teeth(type);
tw = pulley_od(type) * PI / (tooth_count * 2);
ir = pulley_ir(type);
or = pulley_od(type) / 2;
T_angle = 40;
GT_r = 0.555;
for (i = [0 : 1 : tooth_count - 1])
rotate(i * 360 / tooth_count)
if (pulley_type(type)[0] == "G")
translate([0, ir + GT_r])
hull() {
circle(GT_r);
translate([0, GT_r])
square(2 * GT_r, center = true);
}
else
translate([0, (ir + or) / 2])
hull() {
for(side = [-1, 1])
translate([side * tw / 2, 0])
rotate(-side * T_angle / 2)
square([eps, (or - ir)], center = true);
translate([0, 1])
square([tw, eps], center = true);
}
}
module printed_pulley(type) { //! Draw a printable pulley
ft = pulley_flange_thickness(type);
hl = pulley_hub_length(type);
w = pulley_width(type);
r1 = pulley_bore(type) / 2;
or = pulley_od(type) / 2;
function bore_clearance_radius(bore) =
bore == 3 ? M3_clearance_radius :
bore == 4 ? M4_clearance_radius :
bore == 5 ? M5_clearance_radius :
(bore + 0.3) / 2;
module core() {
translate_z(pulley_hub_length(type) + ft)
linear_extrude(w + 1) let($fa = 1, $fs = 0.1)
if ("GT2" == str(pulley_type(type)[0], pulley_type(type)[1], pulley_type(type)[2]))
difference() {
printed_pulley_GT2_teeth(type);
poly_circle(bore_clearance_radius(pulley_bore(type)));
}
else
difference() {
circle(or);
printed_pulley_teeth(type);
poly_circle(bore_clearance_radius(pulley_bore(type)));
}
}
module screw_holes() {
if (pulley_screws(type))
translate_z(pulley_screw_z(type))
for(i = [0 : pulley_screws(type) - 1])
rotate([-90, 180, i * -90])
teardrop(r = screw_pilot_hole(pulley_screw(type)), h = pulley_flange_dia(type)/2 + 1, center=false);
}
// hub
if (hl)
translate_z(pulley_hub_dia(type) >= pulley_flange_dia(type) ? 0 : hl + w + 2 * ft)
render_if(pulley_screw_z(type) < hl)
difference() {
linear_extrude(hl)
difference() {
circle(r = pulley_hub_dia(type) / 2);
poly_circle(bore_clearance_radius(pulley_bore(type)));
}
if (pulley_screw_z(type) < hl)
screw_holes();
}
// bottom flange
translate_z(hl)
linear_extrude(ft)
difference() {
circle(d = pulley_flange_dia(type));
poly_circle(bore_clearance_radius(pulley_bore(type)));
}
// top flange
translate_z(hl + ft + w) {
// inner part, supported by core
linear_extrude(ft)
difference() {
circle(r = or);
poly_circle(bore_clearance_radius(pulley_bore(type)));
}
// outer part at 45 degrees for printing
rotate_extrude()
translate([or -eps , ft])
vflip()
right_triangle(ft, ft);
}
difference() { // T5 pulleys have screws through the teeth
render_if(pulley_type(type)[0]=="T")
core();
if (pulley_screw_z(type) > hl)
translate_z(pulley_hub_dia(type) >= pulley_flange_dia(type) ? 0 : hl)
screw_holes();
}
}
module printed_pulley_assembly(type, colour) { //! Draw a printed pulley with its grub screws in place
translate_z(pulley_offset(type)) {
color(colour)
printed_pulley(type);
if (pulley_screws(type))
translate_z(pulley_screw_z(type))
for(i = [0 : pulley_screws(type) - 1])
rotate([-90, 0, i * -90])
translate_z(pulley_bore(type) / 2 + pulley_screw_length(type))
screw(pulley_screw(type), pulley_screw_length(type));
}
}

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//
// 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/>.
//
include <../core.scad>
include <../vitamins/pulleys.scad>
include <../printed/printed_pulleys.scad>
use <../utils/layout.scad>
module PrintedPulley_test() {
layout([for (p = pulleys) pulley_flange_dia(p)]) {
rotate(-135)
printed_pulley_assembly(pulleys[$i]);
translate([0, 20, 0])
rotate(45)
pulley_assembly(pulleys[$i]);
}
}
if ($preview)
PrintedPulley_test();