Bevel gear attempts, adjust gear parameters, simplify some gears, add some others
parent
7cf07600a0
commit
2f4aefaddc
328
gear-v3.scad
328
gear-v3.scad
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@ -36,8 +36,10 @@
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// Thickness of all gear wheels is 3.8mm
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// Standard 40t gear: root_radius=18.75 outer_radius=20.85 (mm_per_tooth =~ 3.1 by root)
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// Standard 24t gear: root_radius=10.7 outer_radius=12.8 (mm_per_tooth =~ 3.06 by root)
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// Standard 16t gear: root_radius=6.8 outer_radius=7.9 (mm_per_tooth =~ 3.05 by root)
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// Standard 16t gear: root_radius=6.8 outer_radius=8.7 (mm_per_tooth =~ 3.05 by root)
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// Standard 8t gear: root_radius=2.8 outer_radius=4.9 (mm_per_tooth =~ 3.05 by root)
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// Standard 12t bevel gear: 12.7mm bottom diameter, 1.6mm top teeth length, 10.6mm top teeth outer diameter, 7.7mm top teeth root diameter, 2.5mm gear height + 0.5mm flat base + 1mm spacer at bottom
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// Standard 20t idler bevel gear: 20.4mm bottom diameter, 18.4mm top teeth outer diameter, 1.8mm top teeth length, 15.6mm top teeth root diameter
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// Formulas for gear radiuses:
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//outer_radius = mm_per_tooth*(n_teeth/2+1)/3.1415926 - clearance;
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@ -55,15 +57,21 @@
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satellites_32t();
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translate([0, 0, -8])
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color([0.5, 1, 1, 1])
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carrier_32t_simpler();
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translate([0, 0, 16])
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carrier_32t_easy();
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translate([20, 0, 0])
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color([1, 0.5, 0.5, 1])
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rotate([0, 0, -22.5]) std_gear8();
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/*translate([0, 0, 16])
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rotate([0, 180, 0])
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color([0.5, 1, 0.5, 1])
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sun_drive_32t();*/
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/* 2-stud-thick variant of 32-teeth ring gear */
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/* 1-stud/2-stud thick variants of 32-teeth ring gear */
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//ring_gear_2u_32t();
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//ring_gear_1u_32t();
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ring_gear_2u_32t();
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//carrier_32t_not_so_easy();
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//sun_drive_32t_simpler();
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/* Standard 8-teeth gear */
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@ -97,11 +105,11 @@ translate([0, 0, 16])
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/* Half-stud parametric gear with some holes */
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//myGear(24);
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//myGear(16);
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/* Generic gear with involute teeth */
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//gear(mm_per_tooth=3.05, number_of_teeth=24, thickness=3.8, clearance=-0.1);
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//gear(mm_per_tooth=3.05, number_of_teeth=16, thickness=4, pressure_angle=20);
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/* Same, but using an experimental OpenSCAD feature - vector concat() function */
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@ -109,44 +117,27 @@ translate([0, 0, 16])
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//-------------
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// Same as carrier_32t(), but with axle hole at the center
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// Same as carrier_32t(), but solid with axle hole
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module sun_drive_32t() {
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root = 3.06*(32/2-1)/3.1415926;
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segments = 32*2; // so gear teeth edge never match cylinder segment edges
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difference() {
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union() {
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difference() {
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translate([0, 0, 2]) gear_teeth(mm_per_tooth=3.06, number_of_teeth=32, thickness=4, clearance=-0.1);
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cylinder($fn=100, h=8, r=root-0.5);
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}
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cylinder($fn=100, h=8, r=3.5);
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difference() {
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union() {
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difference() {
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translate([0, 0, 0.8-0.1]) cylinder($fn=32*2, h=7.2+0.1, r=root);
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translate([0, 0, -0.1]) cylinder($fn=32*2, h=7.1, r=root-1);
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}
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translate([-8, 0, 0.1]) cylinder($fn=32, h=8-0.2, r=3.5);
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translate([0, -8, 0.1]) cylinder($fn=32, h=8-0.2, r=3.5);
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translate([0, 8, 0.1]) cylinder($fn=32, h=8-0.2, r=3.5);
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translate([8, 0, 0.1]) cylinder($fn=32, h=8-0.2, r=3.5);
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translate([-0.5, -root+0.5, 0]) cube(size=[1, root*2-1, 8]);
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rotate([0, 0, 90]) translate([-0.5, -root+0.5, 0]) cube(size=[1, root*2-1, 8]);
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}
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translate([-20, -20, -0.2]) cube(size=[40, 40, 1]);
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}
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translate([0, 0, 2]) gear_teeth(mm_per_tooth=3.06, number_of_teeth=32, thickness=4, pressure_angle=20);
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cylinder($fn=100, h=7.2, r=root);
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cylinder($fn=100, h=8, r=3.6);
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}
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rotate([0, 0, 45]) axleCut(0, 0, -0.2, 10);
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translate([-8, 0, -0.2]) cylinder($fn=32, h=10, r=2.5);
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translate([0, -8, -0.2]) cylinder($fn=32, h=10, r=2.5);
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translate([0, 8, -0.2]) cylinder($fn=32, h=10, r=2.5);
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translate([8, 0, -0.2]) cylinder($fn=32, h=10, r=2.5);
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translate([-8, 0, -0.2]) cylinder($fn=32, h=10, r=2.55);
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translate([0, -8, -0.2]) cylinder($fn=32, h=10, r=2.55);
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translate([0, 8, -0.2]) cylinder($fn=32, h=10, r=2.55);
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translate([8, 0, -0.2]) cylinder($fn=32, h=10, r=2.55);
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translate([-8, 0, 7.2]) cylinder($fn=32, h=0.8+0.1, r=3);
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translate([0, -8, 7.2]) cylinder($fn=32, h=0.8+0.1, r=3);
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translate([0, 8, 7.2]) cylinder($fn=32, h=0.8+0.1, r=3);
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translate([8, 0, 7.2]) cylinder($fn=32, h=0.8+0.1, r=3);
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translate([-8, 0, -0.1]) cylinder($fn=32, h=1+0.1, r=3);
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translate([0, -8, -0.1]) cylinder($fn=32, h=1+0.1, r=3);
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translate([0, 8, -0.1]) cylinder($fn=32, h=1+0.1, r=3);
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translate([8, 0, -0.1]) cylinder($fn=32, h=1+0.1, r=3);
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}
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}
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@ -156,63 +147,55 @@ module sun_drive_32t_simpler() {
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union() {
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difference() {
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union() {
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gear_teeth(mm_per_tooth=3.06, number_of_teeth=32, thickness=7.2, pressure_angle=20);
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difference() {
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translate([0, 0, 2]) gear_teeth(mm_per_tooth=3.06, number_of_teeth=32, thickness=4, clearance=-0.1);
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cylinder($fn=100, h=8, r=root-0.5);
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cylinder($fn=32*2, h=7.2, r=root);
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translate([0, 0, 1]) cylinder($fn=32*2, h=7.1, r=root-2);
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}
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difference() {
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translate([0, 0, 0.8]) cylinder($fn=32*2, h=7.2, r=root);
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translate([0, 0, -0.1]) cylinder($fn=32*2, h=7.1, r=root-1);
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}
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cylinder($fn=100, h=8, r=3.5);
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cylinder($fn=100, h=8, r=1.95+2);
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union() {
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translate([-0.5, -root+0.5, 0.8]) cube(size=[1, root*2-1, 6.4]);
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rotate([0, 0, 90]) translate([-0.5, -root+0.5, 0.8]) cube(size=[1, root*2-1, 6.4]);
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translate([-1, -root+0.5, 0.8]) cube(size=[2, root*2-1, 6.4]);
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rotate([0, 0, 90]) translate([-1, -root+0.5, 0.8]) cube(size=[2, root*2-1, 6.4]);
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}
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}
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rotate([0, 0, 45]) axleCut(0, 0, -0.2, 10);
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rotate([0, 0, 45]) axle(0, 0, -0.2, 10);
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}
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}
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}
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// Simpler planetary carrier
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module carrier_32t_simpler() {
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root = 3.06*(32/2-1)/3.1415926;
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segments = 32*2; // so gear teeth edge never match cylinder segment edges
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// Symmetric planetary carrier gear (not so easy to print because it needs support)
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module carrier_32t_not_so_easy() {
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root = 3.1*(32/2-1)/3.1415926;
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fn = 32*2; // so gear teeth edge never match cylinder segment edges
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difference() {
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union() {
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difference() {
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translate([0, 0, 2]) gear_teeth(mm_per_tooth=3.06, number_of_teeth=32, thickness=4, clearance=-0.1);
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cylinder($fn=100, h=8, r=root-0.5);
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}
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cylinder($fn=100, h=8, r=3.5);
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difference() {
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union() {
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difference() {
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translate([0, 0, 0.8-0.1]) cylinder($fn=32*2, h=7.2+0.1, r=root);
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translate([0, 0, -0.1]) cylinder($fn=32*2, h=7.1, r=root-1);
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}
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translate([-8, 0, 0.1]) cylinder($fn=32, h=8-0.2, r=3.5);
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translate([0, -8, 0.1]) cylinder($fn=32, h=8-0.2, r=3.5);
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translate([0, 8, 0.1]) cylinder($fn=32, h=8-0.2, r=3.5);
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translate([8, 0, 0.1]) cylinder($fn=32, h=8-0.2, r=3.5);
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translate([-0.5, -root+0.5, 0]) cube(size=[1, root*2-1, 8]);
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rotate([0, 0, 90]) translate([-0.5, -root+0.5, 0]) cube(size=[1, root*2-1, 8]);
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}
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translate([-20, -20, -0.2]) cube(size=[40, 40, 1]);
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}
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translate([0, 0, 2]) gear_teeth(mm_per_tooth=3.1, number_of_teeth=32, thickness=4, pressure_angle=20);
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translate([0, 0, 0.8]) cylinder($fn=fn, r=root, h=6.4);
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cylinder($fn=32, r=2.4+0.15+1.2, h=8);
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}
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translate([0, 0, -0.2]) cylinder($fn=32, h=10, r=2.5);
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translate([0, 0, -0.2]) cylinder($fn=32, h=10, r=2.4+0.15);
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translate([-8, 0, -0.2]) cylinder($fn=32, h=10, r=2.4+0.15);
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translate([0, -8, -0.2]) cylinder($fn=32, h=10, r=2.4+0.15);
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translate([0, 8, -0.2]) cylinder($fn=32, h=10, r=2.4+0.15);
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translate([8, 0, -0.2]) cylinder($fn=32, h=10, r=2.4+0.15);
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}
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}
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translate([-8, 0, -0.2]) cylinder($fn=32, h=10, r=2.5);
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translate([0, -8, -0.2]) cylinder($fn=32, h=10, r=2.5);
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translate([0, 8, -0.2]) cylinder($fn=32, h=10, r=2.5);
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translate([8, 0, -0.2]) cylinder($fn=32, h=10, r=2.5);
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translate([-8, 0, 7.2]) cylinder($fn=32, h=0.8+0.1, r=3);
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translate([0, -8, 7.2]) cylinder($fn=32, h=0.8+0.1, r=3);
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translate([0, 8, 7.2]) cylinder($fn=32, h=0.8+0.1, r=3);
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translate([8, 0, 7.2]) cylinder($fn=32, h=0.8+0.1, r=3);
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// Easy to print planetary carrier gear
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module carrier_32t_easy() {
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root = 3.1*(32/2-1)/3.1415926;
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fn = 32*2; // so gear teeth edge never match cylinder segment edges
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difference() {
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union() {
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gear_teeth(mm_per_tooth=3.1, number_of_teeth=32, thickness=6.4, pressure_angle=20);
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cylinder($fn=fn, r=root, h=6.4);
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cylinder($fn=32, r=2.4+0.15+1.2, h=7.2); // 1.2 = 0.4(nozzle)*3 perimeters
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}
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translate([0, 0, -0.2]) cylinder($fn=32, h=10, r=2.4+0.15);
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translate([-8, 0, -0.2]) cylinder($fn=32, h=10, r=2.4+0.15);
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translate([0, -8, -0.2]) cylinder($fn=32, h=10, r=2.4+0.15);
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translate([0, 8, -0.2]) cylinder($fn=32, h=10, r=2.4+0.15);
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translate([8, 0, -0.2]) cylinder($fn=32, h=10, r=2.4+0.15);
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}
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}
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@ -222,7 +205,7 @@ module carrier_32t() {
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difference() {
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union() {
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difference() {
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translate([0, 0, 2]) gear_teeth(mm_per_tooth=3.06, number_of_teeth=32, thickness=4, clearance=-0.1);
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translate([0, 0, 2]) gear_teeth(mm_per_tooth=3.06, number_of_teeth=32, thickness=4, pressure_angle=20);
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cylinder($fn=100, h=8, r=root-0.5);
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}
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difference() {
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@ -254,79 +237,34 @@ module carrier_32t() {
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}
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// Most compact planetary ring gear: 1 unit thick, 32 teeth outside, 24 teeth inside
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// + 3 notches at each side to lower friction
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module ring_gear_1u_32t() {
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difference() {
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union() {
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translate([0, 0, 2]) gear_teeth(mm_per_tooth=3.06, number_of_teeth=32, thickness=4, clearance=-0.1);
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translate([0, 0, 0.8]) cylinder($fn=32*2, h=6.4, r=3.06*(32/2-1)/3.1415926);
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// top knobs
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translate([-12.8, 0, 6]) difference() {
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sphere($fn=30, r=2, center=true);
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translate([0, 0, -0.9]) cube(size=[6, 6, 4], center=true);
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}
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rotate([0, 0, 120]) translate([-12.8, 0, 6]) difference() {
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sphere($fn=30, r=2, center=true);
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translate([0, 0, -0.9]) cube(size=[6, 6, 4], center=true);
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}
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rotate([0, 0, 240]) translate([-12.8, 0, 6]) difference() {
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sphere($fn=30, r=2, center=true);
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translate([0, 0, -0.9]) cube(size=[6, 6, 4], center=true);
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}
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// bottom knobs
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translate([-12.8, 0, 2]) difference() {
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sphere($fn=30, r=2, center=true);
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translate([0, 0, 0.9]) cube(size=[6, 6, 4], center=true);
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}
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rotate([0, 0, 120]) translate([-12.8, 0, 2]) difference() {
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sphere($fn=30, r=2, center=true);
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translate([0, 0, 0.9]) cube(size=[6, 6, 4], center=true);
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}
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rotate([0, 0, 240]) translate([-12.8, 0, 2]) difference() {
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sphere($fn=30, r=2, center=true);
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translate([0, 0, 0.9]) cube(size=[6, 6, 4], center=true);
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}
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}
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translate([0, 0, 1.8]) gear_teeth(mm_per_tooth=3.1415926, number_of_teeth=24, thickness=4.4, clearance=-0.1);
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translate([0, 0, -0.1]) cylinder($fn=32*2, h=8.2, r=(24/2-1));
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gear(mm_per_tooth=3.06, number_of_teeth=32, thickness=7.8, pressure_angle=20);
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translate([0, 0, 1.7]) gear(mm_per_tooth=3.28, number_of_teeth=24, thickness=4.4, pressure_angle=20);
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translate([0, 0, -0.1]) cylinder($fn=32*2, h=8.2, r=3.28*(24/2-1)/3.1415926);
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}
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}
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// 2U 32T ring gear, with mounting holes
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// Solid easy-to-print 2U 32T ring gear, with mounting holes
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module ring_gear_2u_32t() {
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fn = 32*2;
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difference() {
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union() {
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translate([0, 0, 10]) gear_teeth(mm_per_tooth=3.06, number_of_teeth=32, thickness=4, clearance=-0.1);
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translate([0, 0, 2]) cylinder($fn=fn, h=14, r=3.06*(32/2-1)/3.1415926);
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gear_teeth(mm_per_tooth=3.1, number_of_teeth=32, thickness=6.4, pressure_angle=20);
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cylinder($fn=fn, h=13.2, r=3.1*(32/2-1)/3.1415926);
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}
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difference() {
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cylinder($fn=fn, h=8.8, r=3.06*(32/2+1)/3.1415926+1);
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translate([0, 0, -0.1]) cylinder($fn=fn, h=9, r=24/2+2.1);
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translate([0, 0, 6.4]) difference() {
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// inner 24-teeth gear radius should be 26.4mm, but we also make it slightly bigger
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gear(mm_per_tooth=3.28, number_of_teeth=24, thickness=8.8+0.1, pressure_angle=20);
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// printed holes are generally smaller than model ones by 0.5-0.6mm... => +0.3 radius :-(
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cylinder($fn=fn, h=0.8, r=2.4+1+0.3);
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}
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translate([0, 0, -0.1]) difference() {
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gear(mm_per_tooth=3.1415926, number_of_teeth=24, thickness=8.8+0.1, clearance=-0.1);
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translate([0, 0, 8-0.1]) cylinder($fn=fn, h=0.8+0.2, r=3.5);
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}
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translate([0, 0, 9.8]) difference() {
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cylinder($fn=fn, h=8, r=(3.06*(32/2-1)/3.1415926-1));
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translate([-0.5, -20, -0.1]) cube(size=[1, 40, 10]);
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translate([-20, -0.5, -0.1]) cube(size=[40, 1, 10]);
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translate([0, 0, -0.1]) cylinder($fn=fn, h=10, r=3.5);
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translate([0, -8, -0.1]) cylinder($fn=fn, h=10, r=3.5);
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translate([0, 8, -0.1]) cylinder($fn=fn, h=10, r=3.5);
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translate([-8, 0, -0.1]) cylinder($fn=fn, h=10, r=3.5);
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translate([8, 0, -0.1]) cylinder($fn=fn, h=10, r=3.5);
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}
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translate([0, 0, 15.2]) difference() {
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cylinder($fn=fn, h=1, r=(3.06*(32/2+1)/3.1415926+1));
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translate([0, 0, -0.1]) cylinder($fn=fn, h=10, r=3.5);
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}
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translate([0, 0, -0.1]) cylinder($fn=fn, h=20, r=2.5);
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translate([0, -8, -0.1]) cylinder($fn=fn, h=20, r=2.5);
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translate([0, 8, -0.1]) cylinder($fn=fn, h=20, r=2.5);
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translate([-8, 0, -0.1]) cylinder($fn=fn, h=20, r=2.5);
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translate([8, 0, -0.1]) cylinder($fn=fn, h=20, r=2.5);
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// same for other holes
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translate([0, 0, -0.1]) cylinder($fn=fn, h=20, r=2.4+0.3);
|
||||
translate([0, -8, -0.1]) cylinder($fn=fn, h=20, r=2.4+0.3);
|
||||
translate([0, 8, -0.1]) cylinder($fn=fn, h=20, r=2.4+0.3);
|
||||
translate([-8, 0, -0.1]) cylinder($fn=fn, h=20, r=2.4+0.3);
|
||||
translate([8, 0, -0.1]) cylinder($fn=fn, h=20, r=2.4+0.3);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -341,12 +279,50 @@ module satellites_32t() {
|
|||
|
||||
//-------------
|
||||
|
||||
// An attempt to make something like standard 20t bevel gear...
|
||||
module bevel_20t() {
|
||||
difference() {
|
||||
union() {
|
||||
translate([0, 0, 1.5])
|
||||
linear_extrude(slices=5, height=2.5, scale=(20/2+1-2.5*tan(45))/(20/2+1), twist=0)
|
||||
gear_concat_flat(mm_per_tooth=3.53, number_of_teeth=20, backlash=2, clearance=0.8, trim_factor=0.7);
|
||||
cylinder($fn=48, h=1.5, r=3.53*(20/2-1)/3.1415926);
|
||||
cylinder($fn=48, h=4, r=3.53*(20/2-1)/3.1415926*(20/2+1-2.5*tan(45))/(20/2+1));
|
||||
}
|
||||
translate([0, 0, -0.1])
|
||||
difference() {
|
||||
cylinder($fn=48, h=8, r=100);
|
||||
translate([0, 0, -0.1]) cylinder($fn=48, h=8.2, r=3.53*(20/2-1)/3.1415926);
|
||||
}
|
||||
axle(0, 0, -0.2, 10);
|
||||
}
|
||||
}
|
||||
|
||||
// An attempt to make something like standard 12t bevel gear...
|
||||
module bevel_12t() {
|
||||
difference() {
|
||||
union() {
|
||||
translate([0, 0, 1.5])
|
||||
linear_extrude(slices=5, height=2.5, scale=(12/2+1-2.5*tan(45))/(12/2+1), twist=0)
|
||||
gear_concat_flat(mm_per_tooth=3.76, number_of_teeth=12, backlash=1, clearance=0.4, trim_factor=0.75);
|
||||
cylinder($fn=48, h=1.5, r=3.76*(12/2-1)/3.1415926);
|
||||
cylinder($fn=48, h=4, r=3.76*(12/2-1)/3.1415926*(12/2+1-2.5*tan(45))/(12/2+1));
|
||||
}
|
||||
translate([0, 0, -0.1])
|
||||
difference() {
|
||||
cylinder($fn=48, h=8, r=10);
|
||||
translate([0, 0, -0.1]) cylinder($fn=48, h=8.2, r=3.76*(12/2-1)/3.1415926);
|
||||
}
|
||||
axle(0, 0, -0.2, 10);
|
||||
}
|
||||
}
|
||||
|
||||
// Standard 8-teeth gear
|
||||
module std_gear8() {
|
||||
difference() {
|
||||
union() {
|
||||
cylinder($fn=50, h=8, r=3.05*(8/2-1)/3.1415926);
|
||||
translate([0, 0, 2.1]) gear(mm_per_tooth=3.05, number_of_teeth=8, thickness=3.8, clearance=-0.1);
|
||||
translate([0, 0, 2.1]) gear(mm_per_tooth=3.05, number_of_teeth=8, thickness=3.8, pressure_angle=20);
|
||||
}
|
||||
axle(0, 0, -1, 10);
|
||||
}}
|
||||
|
|
@ -358,7 +334,7 @@ module planetary_ring_gear(plane_height = 1) {
|
|||
difference() {
|
||||
union() {
|
||||
cylinder($fn=80, h=2, r=(0.1+3.1*(40/2+1)/3.1415926));
|
||||
translate([0, 0, 2]) gear(mm_per_tooth=3.1, number_of_teeth=40, thickness=4, clearance=-0.1);
|
||||
translate([0, 0, 2]) gear(mm_per_tooth=3.1, number_of_teeth=40, thickness=4, pressure_angle=20);
|
||||
translate([0, 0, 5]) cylinder($fn=80, h=2.2, r=(3.1*(40/2-1)/3.1415926));
|
||||
cylinder($fn=50, h=8, r=3.5);
|
||||
}
|
||||
|
|
@ -447,7 +423,7 @@ module offsetGearSparse(number_of_teeth, gear_height=3.9, jaggy=1) {
|
|||
module offsetGear(number_of_teeth, gear_height=3.9, jaggy=1) {
|
||||
difference() {
|
||||
union() {
|
||||
gear(number_of_teeth=number_of_teeth, mm_per_tooth=3.05, thickness=gear_height, clearance=-0.1);
|
||||
gear(number_of_teeth=number_of_teeth, mm_per_tooth=3.05, thickness=gear_height, pressure_angle=20);
|
||||
translate([0, 0, gear_height]) cylinder($fs=0.5, h=8-gear_height, r=3.5);
|
||||
}
|
||||
// axle hole
|
||||
|
|
@ -491,8 +467,8 @@ module offsetClutchGear(number_of_teeth, gear_height=3.8) {
|
|||
|
||||
// Axle
|
||||
module axle(x, y, z, height) {
|
||||
axle_gap = 1.85;
|
||||
hole_radius = 2.5;
|
||||
axle_gap = 1.95;
|
||||
hole_radius = 2.55;
|
||||
union() {
|
||||
translate([x - hole_radius, y - axle_gap/2, z])
|
||||
roundedRect([hole_radius * 2, axle_gap, height], .2);
|
||||
|
|
@ -503,15 +479,22 @@ module axle(x, y, z, height) {
|
|||
|
||||
// Axle hole (for difference()) with fixing slit
|
||||
module axleCut(x, y, z, height) {
|
||||
axle_gap = 1.85;
|
||||
axle_gap_cut = 1.7;
|
||||
hole_radius = 2.5;
|
||||
axle_gap = 1.95;
|
||||
axle_gap_cut = 1.8;
|
||||
hole_radius = 2.55;
|
||||
union() {
|
||||
translate([x - hole_radius, y - axle_gap/2, z])
|
||||
roundedRect([hole_radius * 2, axle_gap, height], .2);
|
||||
translate([x - axle_gap_cut/2, y - hole_radius, z])
|
||||
roundedRect([axle_gap_cut, hole_radius * 2, height], .2);
|
||||
translate([x-0.25, y-5, z]) cube(size=[0.5, 10, height]);
|
||||
translate([x, y, z]) difference() {
|
||||
cylinder($fn=32, r=4, h=height);
|
||||
translate([0, 0, -0.1]) cylinder($fn=32, r=3.6, h=height+0.2);
|
||||
translate([-2, -5, -0.1]) cube(size=[4, 10, height+0.2]);
|
||||
/* translate([0, -2*sqrt(2), height/2-0.1]) rotate([0, 0, 45]) cube(size=[4, 4, height+0.2], center=true);
|
||||
translate([0, 2*sqrt(2), height/2-0.1]) rotate([0, 0, 45]) cube(size=[4, 4, height+0.2], center=true);*/
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -521,7 +504,7 @@ module clutchGear(number_of_teeth) {
|
|||
union() {
|
||||
difference() {
|
||||
union() {
|
||||
gear(thickness=3.7, mm_per_tooth=3.05, number_of_teeth=number_of_teeth, clearance = -0.1);
|
||||
gear(thickness=3.7, mm_per_tooth=3.05, number_of_teeth=number_of_teeth, pressure_angle=20);
|
||||
translate([0, 0, 1]) cylinder($fn=number_of_teeth*2, h=5.8-1, r=6.8);
|
||||
translate([0, 0, -2]) cylinder($fn=number_of_teeth*2, h=2+1, r=3.7);
|
||||
}
|
||||
|
|
@ -580,7 +563,7 @@ module myGearParamed(num_teeth, holes_row, holes_col, plus_row, plus_col)
|
|||
hole_radius = 2.5;
|
||||
|
||||
difference() {
|
||||
gear(thickness=gearHeight, number_of_teeth=num_teeth, mm_per_tooth=3.1415926);
|
||||
gear(thickness=gearHeight, number_of_teeth=num_teeth, mm_per_tooth=3.06, pressure_angle=20);
|
||||
|
||||
// We do two rectangular grids of holes, rotate 90 degrees and do them
|
||||
// again.
|
||||
|
|
@ -747,7 +730,6 @@ module gear_teeth(
|
|||
}
|
||||
};
|
||||
|
||||
|
||||
// Same gear, but using recursion and experimental OpenSCAD vector
|
||||
// concat() function which must be enabled at compile time with CONFIG+=experimental
|
||||
// Clean and slightly faster
|
||||
|
|
@ -774,6 +756,43 @@ module gear_concat(
|
|||
);
|
||||
};
|
||||
|
||||
// Same in 2D (non-extruded)
|
||||
module gear_concat_flat(
|
||||
mm_per_tooth = 3, //this is the "circular pitch", the circumference of the pitch circle divided by the number of teeth
|
||||
number_of_teeth = 11, //total number of teeth around the entire perimeter
|
||||
pressure_angle = 28, //Controls how straight or bulged the tooth sides are. In degrees.
|
||||
clearance = 0.0, //gap between top of a tooth on one gear and bottom of valley on a meshing gear (in millimeters)
|
||||
backlash = 0.0, //gap between two meshing teeth, in the direction along the circumference of the pitch circle
|
||||
trim_factor = 1
|
||||
) {
|
||||
assign(pi = 3.1415926)
|
||||
assign(p = mm_per_tooth * number_of_teeth / pi / 2) //radius of pitch circle
|
||||
assign(c = p + mm_per_tooth / pi - clearance) //radius of outer circle
|
||||
assign(b = p*cos(pressure_angle)) //radius of base circle
|
||||
assign(r = p-(c-p)-clearance) //radius of root circle
|
||||
assign(t = mm_per_tooth/2-backlash/2) //tooth thickness at pitch circle
|
||||
assign(k = -iang(b, p) - t/2/p/pi*180) //angle to where involute meets base circle on each side of tooth
|
||||
polygon(
|
||||
points = gear_points_trimmed(r, b, c, k, number_of_teeth, number_of_teeth, trim_factor),
|
||||
paths = [ range(15*(number_of_teeth)) ]
|
||||
);
|
||||
};
|
||||
function gear_points_trimmed(r, b, c, k, number_of_teeth, i, f) =
|
||||
(i <= 0 ? [] : concat(
|
||||
gear_points_trimmed(r, b, c, k, number_of_teeth, i-1, f),
|
||||
tooth_base_points_trimmed(r, b, c, k, number_of_teeth, i, f)
|
||||
));
|
||||
function tooth_base_points_trimmed(r, b, c, k, number_of_teeth, i, f) =
|
||||
(r < b ? concat(
|
||||
[ polar(r*f, i*360/number_of_teeth + k) ],
|
||||
tooth_points(r, b, c, k, number_of_teeth, i),
|
||||
[ polar(r*f, i*360/number_of_teeth - k),
|
||||
polar(r*f, i*360/number_of_teeth + 180/number_of_teeth) ]
|
||||
) : concat(
|
||||
tooth_points(r, b, c, k, number_of_teeth, i),
|
||||
[ polar(r*f, i*360/number_of_teeth + 180/number_of_teeth) ]
|
||||
));
|
||||
|
||||
function gear_points(r, b, c, k, number_of_teeth, i) =
|
||||
(i <= 0 ? [] : concat(
|
||||
gear_points(r, b, c, k, number_of_teeth, i-1),
|
||||
|
|
@ -814,7 +833,6 @@ function q7r(f,r,b,r2,t,s,rot) = q6r(b,s,t,(1-f)*max(b,r)+f*r2,rot);
|
|||
function q6r(b,s,t,d,rot) = polar(d,rot+s*(iang(b,d)+t));
|
||||
|
||||
|
||||
|
||||
// Original gear() module
|
||||
// Teeth shape is good, but the body is composed from individual sectors;
|
||||
// this sometimes results in bad "degenerate" faces due to floating point issues.
|
||||
|
|
|
|||
Loading…
Reference in New Issue