Use 2.5 hole radius, replace comments, fix carrier_simpler and sun_drive
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4735bbc937
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2db882cf7e
27464
32t-carrier-simpler.stl
27464
32t-carrier-simpler.stl
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37546
32t-sun-drive.stl
37546
32t-sun-drive.stl
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18828
40t-2u-ring-gear.stl
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40t-2u-ring-gear.stl
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158
gear-v3.scad
158
gear-v3.scad
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@ -1,5 +1,3 @@
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// Algorithmic LEGO(r) Technic compatible gear generator
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//
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// NOTE regarding Patents: Since 1977 the LEGO Group has produced "Technic"
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// elements with gear teeth, axles, axle-holes, and other features closely
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// resembling the design(s) in this file, as part of their "Expert Builder"
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@ -18,56 +16,17 @@
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// to make objects and then try to "pass them off" as LEGO products. See
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// for example the Kirkbi AG v. Ritvik Holdings Inc. case, (Supreme Court of
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// Canada [2005] 3 S.C.R. 302).
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//
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// This was originally created by user bjepson on Thingiverse (thing 29989),
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// then heavily modified and expanded by Robert Munafo:
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// 20121226: separate parameters for rows/columns of cylinder holes and of
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// "plus-shaped" holes
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// * Rotate the holes by 20 degrees to take advantage of
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// edge dithering both for improved hole width resolution
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// and to provide a rough surface which better grips the
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// smooth axles.
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// * You can now get more than just a single row of plus-holes
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// in each direction
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//
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// 20130105: added MCAD functions to make this file work all by itself (no
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// need to hunt down missing pieces elsewhere)
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// * More accurate axle hole dimensions
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// * Round holes are actually round now (imagine that!)
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// * Automatically determines correct parameters for number and placement
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// of holes, based on number of teeth
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//
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// 20130106: fix small glitch seen at junction of fillet and bottom land (for
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// illustration of the problem, see "0106-fix.jpg" at
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// thingiverse.com/thing:40410)
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// 32 teeth is the real "missing" gear size, because all the other
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// multiples of 8 are available. An argument can also be made for 28 (which
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// however is available in the new small turntable) or any other multiple of 4
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// because the official gears are all multiples of 4, namely: 8, 12, 16,
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// 20, 24, 28(turntable), 36, 40 and 56(big turntable).
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// Contains some code from thing 29989 by bjepson on Thingiverse, thing 40410
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// by Robert Munafo, and MCAD library. myGear() from 40410 is here, but with
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// different (better) involute gear teeth shape, and with some tweaks to make
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// better gears without degenerate faces.
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//
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// For my orrery designs ( see mrob.com/orrery ) I might use any integer
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// number of teeth from 8 up to around 60 or 70.
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// Everything other is (c)oded by me, Vitaliy Filippov. License is GNU LGPL2.1+
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//
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// The holes parameters need to be chosen a certain way. To get a normal style
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// gear with a + hole in the middle, the plus_row and plus_col should both
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// be odd, and the holes_row, holes_col should both be even. To get a round
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// hole in the center, do it the other way 'round. Then invoke it as
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// myGearParamed(n_teeth, holes_row, holes_col, plus_row, plus_col)
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//
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// Examples:
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// my 20 gear: holes_row=2, holes_col=2, plus_row=1, plus_col=1
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// Standard 24 gear: holes_row=2, holes_col=2, plus_row=1, plus_col=1
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// my 28 gear: holes_row=2, holes_col=2, plus_row=3, plus_col=1
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// my 32 gear: holes_row=2, holes_col=2, plus_row=3, plus_col=3
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// nonstandard 36 gear: holes_row=2, holes_col=2, plus_row=3, plus_col=3
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// Standard 40 gear: holes_row=4, holes_col=2, plus_row=3, plus_col=3
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// my 44 gear: holes_row=4, holes_col=2, plus_row=3, plus_col=3
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// my 48 gear: holes_row=4, holes_col=4, plus_row=5, plus_col=3
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//
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// By default, the myGear function chooses the best values for all the holes paramters
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// based on the number of teeth.
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// Also I HIGHLY recommend to build OpenSCAD from my fork: github.com/vitalif/openscad,
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// because there's a patch that makes OpenSCAD to use Delaunay triangulation which
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// greatly improves the resulting model quality.
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// Standard LEGO dimensions:
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// Stud spacing = 8mm
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@ -107,7 +66,7 @@ translate([0, 0, 16])
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/* Planetary ring gear with both inner and outer 40 teeth */
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//planetary_ring_gear(plane_height=1);
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planetary_ring_gear(plane_height=1);
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/* 40-teeth planetary ring gear with clutch */
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@ -115,7 +74,7 @@ translate([0, 0, 16])
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/* Solid clutch gear, like standard 16-teeth */
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clutchGear(32);
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//clutchGear(32);
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/* Gear with clutch fully offset to one side */
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@ -145,6 +104,7 @@ clutchGear(32);
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//-------------
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// Same as carrier_32t(), but with axle hole at the center
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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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@ -154,31 +114,34 @@ module sun_drive_32t() {
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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($fn=100, h=8, r=root-0.5);
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}
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translate([0, 0, 3.5]) cylinder($fn=32*2, h=1, r=root-0.5);
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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($fn=32*2, h=7.3, r=root-1);
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translate([0, 0, 7.2-0.1]) cylinder($fn=32*2, h=1, r=3.06*(24/2)/3.1415926);
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translate([0, 0, -0.1]) cylinder($fn=32*2, h=7.1, r=root-1);
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}
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translate([-8, 0, 0]) cylinder($fn=32*2, h=8, r=3.5);
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translate([0, -8, 0]) cylinder($fn=32*2, h=8, r=3.5);
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translate([0, 8, 0]) cylinder($fn=32*2, h=8, r=3.5);
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translate([8, 0, 0]) cylinder($fn=32*2, h=8, r=3.5);
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translate([-8, 0, 0.1]) cylinder($fn=32, h=8-0.2, r=3.5);
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translate([0, -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($fn=32, h=8-0.2, r=3.5);
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translate([-0.5, -root+0.5, 0]) cube(size=[1, root*2-1, 8]);
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rotate([0, 0, 90]) translate([-0.5, -root+0.5, 0]) cube(size=[1, root*2-1, 8]);
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}
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translate([0, 0, 8-0.8]) cylinder($fn=32*2, r=3.06*(24/2)/3.1415926, h=1);
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translate([-20, -20, -0.2]) cube(size=[40, 40, 1]);
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}
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}
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translate([-8, 0, -0.2]) cylinder($fn=32*2, h=10, r=2.4);
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translate([0, -8, -0.2]) cylinder($fn=32*2, h=10, r=2.4);
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translate([0, 8, -0.2]) cylinder($fn=32*2, h=10, r=2.4);
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translate([8, 0, -0.2]) cylinder($fn=32*2, h=10, r=2.4);
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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, 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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}
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}
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@ -217,13 +180,13 @@ module carrier_32t_simpler() {
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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($fn=100, h=8, r=root-0.5);
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}
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difference() {
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translate([0, 0, 0.8-0.1]) cylinder($fn=32*2, h=7.2+0.1, r=root);
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translate([0, 0, -0.1]) cylinder($fn=32*2, h=7.1, r=root-1);
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}
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cylinder($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($fn=32, h=8-0.2, r=3.5);
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@ -231,21 +194,20 @@ module carrier_32t_simpler() {
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translate([-0.5, -root+0.5, 0]) cube(size=[1, root*2-1, 8]);
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rotate([0, 0, 90]) translate([-0.5, -root+0.5, 0]) cube(size=[1, root*2-1, 8]);
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}
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translate([-20, -20, 8-0.8]) cube(size=[40, 40, 1]);
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translate([-20, -20, -0.2]) cube(size=[40, 40, 1]);
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}
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}
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translate([0, 0, -0.2]) cylinder($fn=32, h=10, r=2.4);
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translate([0, 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=2.4);
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translate([0, -8, -0.2]) cylinder($fn=32, h=10, r=2.4);
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translate([0, 8, -0.2]) cylinder($fn=32, h=10, r=2.4);
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translate([8, 0, -0.2]) cylinder($fn=32, h=10, r=2.4);
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translate([-8, 0, -0.2]) cylinder($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=2.9);
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translate([0, -8, 7.2]) cylinder($fn=32, h=0.8+0.1, r=2.9);
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translate([0, 8, 7.2]) cylinder($fn=32, h=0.8+0.1, r=2.9);
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translate([8, 0, 7.2]) cylinder($fn=32, h=0.8+0.1, r=2.9);
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translate([-8, 0, 7.2]) cylinder($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($fn=32, h=0.8+0.1, r=3);
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}
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}
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@ -278,11 +240,11 @@ module carrier_32t() {
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translate([-20, -20, -0.2]) cube(size=[40, 40, 1]);
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}
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}
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translate([-8, 0, -0.2]) cylinder($fn=32*2, h=10, r=2.4);
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translate([0, -8, -0.2]) cylinder($fn=32*2, h=10, r=2.4);
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translate([0, 0, -0.2]) cylinder($fn=32*2, h=10, r=2.4);
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translate([0, 8, -0.2]) cylinder($fn=32*2, h=10, r=2.4);
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translate([8, 0, -0.2]) cylinder($fn=32*2, h=10, r=2.4);
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translate([-8, 0, -0.2]) cylinder($fn=32*2, h=10, r=2.5);
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translate([0, -8, -0.2]) cylinder($fn=32*2, h=10, r=2.5);
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translate([0, 0, -0.2]) cylinder($fn=32*2, h=10, r=2.5);
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translate([0, 8, -0.2]) cylinder($fn=32*2, h=10, r=2.5);
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translate([8, 0, -0.2]) cylinder($fn=32*2, h=10, r=2.5);
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}
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}
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@ -383,7 +345,7 @@ module planetary_ring_gear_with_clutch() {
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rotate([0, 0, -135]) translate([-0.5, 10, -0.1]) cube(size=[1, 10, 10]);
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rotate([0, 0, 135]) translate([-0.5, 10, -0.1]) cube(size=[1, 10, 10]);*/
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}
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translate([0, 0, -0.1]) cylinder($fn=100, h=10, r=2.4);
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translate([0, 0, -0.1]) cylinder($fn=100, h=10, r=2.5);
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}
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translate([0, 0, 10.2]) union() {
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clutchTeeth();
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@ -433,15 +395,15 @@ module planetary_ring_gear(plane_height = 1) {
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translate([8, 0, -0.1]) cylinder($fn=50, h=10, r=3.5);
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translate([8, 8, -0.1]) cylinder($fn=50, h=10, r=3.5);
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}
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translate([-8, -8, -0.1]) cylinder($fn=50, h=10, r=2.4);
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translate([-8, 0, -0.1]) cylinder($fn=50, h=10, r=2.4);
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translate([-8, 8, -0.1]) cylinder($fn=50, h=10, r=2.4);
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translate([0, -8, -0.1]) cylinder($fn=50, h=10, r=2.4);
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translate([0, 0, -0.1]) cylinder($fn=50, h=10, r=2.4);
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translate([0, 8, -0.1]) cylinder($fn=50, h=10, r=2.4);
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translate([8, -8, -0.1]) cylinder($fn=50, h=10, r=2.4);
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translate([8, 0, -0.1]) cylinder($fn=50, h=10, r=2.4);
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translate([8, 8, -0.1]) cylinder($fn=50, h=10, r=2.4);
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translate([-8, -8, -0.1]) cylinder($fn=50, h=10, r=2.5);
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translate([-8, 0, -0.1]) cylinder($fn=50, h=10, r=2.5);
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translate([-8, 8, -0.1]) cylinder($fn=50, h=10, r=2.5);
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translate([0, -8, -0.1]) cylinder($fn=50, h=10, r=2.5);
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translate([0, 0, -0.1]) cylinder($fn=50, h=10, r=2.5);
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translate([0, 8, -0.1]) cylinder($fn=50, h=10, r=2.5);
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translate([8, -8, -0.1]) cylinder($fn=50, h=10, r=2.5);
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translate([8, 0, -0.1]) cylinder($fn=50, h=10, r=2.5);
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translate([8, 8, -0.1]) cylinder($fn=50, h=10, r=2.5);
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}
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}
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}
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@ -461,9 +423,9 @@ module gear28_4holes() {
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// from some solid part (like half or full beam)
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module pinHole(height=8) {
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union() {
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translate([0, 0, -0.1]) cylinder($fs=0.5, h=height+0.2, r=2.4);
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translate([0, 0, -0.1]) cylinder($fs=0.5, h=0.8+0.1, r=2.9);
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translate([0, 0, height-0.8]) cylinder($fs=0.5, h=0.8+0.1, r=2.9);
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translate([0, 0, -0.1]) cylinder($fs=0.5, h=height+0.2, r=2.5);
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translate([0, 0, -0.1]) cylinder($fs=0.5, h=0.8+0.1, r=3);
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translate([0, 0, height-0.8]) cylinder($fs=0.5, h=0.8+0.1, r=3);
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}
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}
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@ -513,7 +475,7 @@ module offsetClutchGear(number_of_teeth) {
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translate([0, 0, 4.8]) cylinder($fn=100, h=4, r=3.3);
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}
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// round hole
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translate([0, 0, -3]) cylinder($fn=100, h=12, r=2.45);
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translate([0, 0, -3]) cylinder($fn=100, h=12, r=2.5);
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// axle hole
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//axle(0, 0, -1, 10);
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}
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@ -529,7 +491,7 @@ module offsetClutchGear(number_of_teeth) {
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// Axle
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module axle(x, y, z, height) {
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axle_gap = 1.85;
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hole_radius = 2.4;
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hole_radius = 2.5;
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union() {
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translate([x - hole_radius, y - axle_gap/2, z])
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roundedRect([hole_radius * 2, axle_gap, height], .2);
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@ -542,7 +504,7 @@ module axle(x, y, z, height) {
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module axleCut(x, y, z, height) {
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axle_gap = 1.85;
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axle_gap_cut = 1.7;
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hole_radius = 2.4;
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hole_radius = 2.5;
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union() {
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translate([x - hole_radius, y - axle_gap/2, z])
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roundedRect([hole_radius * 2, axle_gap, height], .2);
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