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107 lines
2.3 KiB
OpenSCAD
107 lines
2.3 KiB
OpenSCAD
include <config.scad>
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use <GDMUtils.scad>
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use <publicDomainGearV1.1.scad>
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$fa = 2;
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$fs = 2;
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module drive_gear() {
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shaft = motor_shaft_size + printer_slop;
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rack_module = rack_tooth_size / pi;
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gear_pcd = gear_teeth * rack_module;
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addendum = rack_module;
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dedendum = (2.4*rack_module) - addendum;
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gear_id = gear_pcd - 2*dedendum;
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gear_od = gear_pcd + 2*addendum;
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CA = 30;
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twist = 360*0.5*rack_height*tan(CA) / (gear_pcd * pi);
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color("Salmon")
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prerender(convexity=10)
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union() {
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difference() {
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// Herringbone gear
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zflip_copy() {
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up(rack_height/2/2) {
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gear (
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mm_per_tooth = rack_tooth_size,
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number_of_teeth = gear_teeth,
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thickness = rack_height/2,
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hole_diameter = shaft,
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twist = twist,
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teeth_to_hide = 0,
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pressure_angle = 20,
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backlash = gear_backlash
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);
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}
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}
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// Bevel end of gear.
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up(rack_height/2) {
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difference() {
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down(3/2-1) cylinder(h=3, d=gear_od+2, center=true);
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down(2/2) cylinder(h=2+0.05, d1=gear_od, d2=gear_id, center=true);
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}
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}
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}
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difference() {
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union() {
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// Fix up gear weirdness with solid center.
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cylinder(h=rack_height, d=gear_id, center=true);
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// Base
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down((rack_height+10)/2)
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cylinder(h=gear_base, d=max(18,gear_od), center=true);
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}
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difference() {
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// Shaft hole
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cylinder(h=(rack_height+gear_base)*3, r=shaft/2, center=true, $fn=24);
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if (motor_shaft_flatted) {
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// Shaft flat side.
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right(1.4*shaft)
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cube(size=[shaft*2, shaft*2, (rack_height+gear_base)*3], center=true);
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}
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}
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// chamfer bottom of shaft hole.
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down(rack_height/2+10) {
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cylinder(h=4, d1=shaft+3, d2=shaft-1, center=true);
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}
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right(motor_shaft_size/2+1.5) {
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down(rack_height/2+gear_base/2) {
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yrot(90) {
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// Nut Slot
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scale([1.1, 1.1, 1.1]) hull() {
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metric_nut(size=set_screw_size, hole=false);
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right(gear_base/2) metric_nut(size=set_screw_size, hole=false);
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}
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// Set screw hole.
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down(4) zrot(10) cylinder(r=set_screw_size/2+printer_slop, h=30, $fn=16);
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}
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}
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}
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}
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}
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}
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//!drive_gear();
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module drive_gear_parts() { // make me
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up(gear_base+rack_height/2) {
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drive_gear();
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}
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}
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drive_gear_parts();
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// vim: noexpandtab tabstop=4 shiftwidth=4 softtabstop=4 nowrap
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